I would like to try buying a ceramic kitchen knife like this

ebay 310099844249

just mostly out of curiosity. Has anyone tried them. Thanks
--
Due to extreme spam originating from Google Groups, and their inattention
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Ignoramus6517 wrote:

I would like to try buying a ceramic kitchen knife like this

ebay 310099844249

just mostly out of curiosity. Has anyone tried them. Thanks

Haven't tried them personally. They're supposed to be very sharp and
stay sharp, but they are of course relatively brittle, so unlike a
conventional steel knife you can break it fairly easily. I believe the
infamous Harbor Freight carries one or two models.

On 2008-11-18, Pete C. wrote:

Ignoramus6517 wrote:

I would like to try buying a ceramic kitchen knife like this

ebay 310099844249

just mostly out of curiosity. Has anyone tried them. Thanks

Haven't tried them personally. They're supposed to be very sharp and
stay sharp, but they are of course relatively brittle, so unlike a
conventional steel knife you can break it fairly easily. I believe the
infamous Harbor Freight carries one or two models.

Everything that is from HF and has sharp edges, does not stay sharp
for long. I like their stuff that is welded, forged, but not sharp
edged or motor powered.

--
Due to extreme spam originating from Google Groups, and their inattention
to spammers, I and many others block all articles originating
from Google Groups. If you want your postings to be seen by
more readers you will need to find a different means of
posting on Usenet.
http://improve-usenet.org/

In article ,
Ignoramus6517 wrote:

I would like to try buying a ceramic kitchen knife like this

ebay 310099844249

just mostly out of curiosity. Has anyone tried them. Thanks

I bought a 5" version from Harbor Freight and love it. Very sharp, does
not stain. AFAIK does not respond to a metal detector, I think it is
considered a plastic knife by TSA

Free men own guns - www(dot)geocities(dot)com/CapitolHill/5357/
** Posted from http://www.teranews.com **

In article . com,
"Pete C." wrote:

Ignoramus6517 wrote:

I would like to try buying a ceramic kitchen knife like this

ebay 310099844249

just mostly out of curiosity. Has anyone tried them. Thanks

Haven't tried them personally. They're supposed to be very sharp and
stay sharp, but they are of course relatively brittle, so unlike a
conventional steel knife you can break it fairly easily. I believe the
infamous Harbor Freight carries one or two models.

I have the HF 5" model, it is tough & sharp and doesn't stain or rust.
It seems sharper than steel, and easily cuts the tough plastic bubble
packages better than anything else i've tried. IIRC it is non-metallic
and missed by metal detectors and I believe it is considered 'plastic'
by TSA

Free men own guns - www(dot)geocities(dot)com/CapitolHill/5357/

"nick hull" wrote in message
...
In article . com,
"Pete C." wrote:

IIRC it is non-metallic
and missed by metal detectors and I believe it is considered 'plastic'
by TSA


Actually, I just saw these made on the "How it's Made" TV show. For security
concerns, they mix a small amount of metal powder in the knife so it Does
set off the metal detectors.



--
Smitty
Somerset, PA

Ignoramus6517 wrote:
I would like to try buying a ceramic kitchen knife like this

ebay 310099844249

just mostly out of curiosity. Has anyone tried them. Thanks

Without looking on fleabay I can say I have a nice set Kyocera Classic
Ceramics.

They works VERY well for routine kitchen work. the edge is sharper than
most of my steel blades and holds it a long time. They don't stain when
used to cut acidic foods, and they slice straight due to the low
friction of the ceramic. It is possible to sharpen them if you dull the
edge HOWEVER I would suggest sending them back to the company as the
edge requires more than just a diamond stone to sharpen it properly.

Drawbacks, the blades CAN be fragile, it depends on who actually made
them and how they finished them. You also want a GOOD wood or plastic
cutting board, just like the ones you want for steel blades. That keeps
the edge from being damaged and worn. NO HAMMERING ON THE BACKSTRAP!!!

The top names in ceramics are Kyocera, Tachi, Shenzhen (who also make
ceramic blades for a couple of the HIGH end steel blade companies)

http://www.kyoceraadvancedceramics.com/
http://www.tachiblades.com/
http://www.shenzhenknives.com/

--
Steve W.
Near Cooperstown, New York


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On Mon, 17 Nov 2008 20:22:21 -0600, the infamous Ignoramus6517
scrawled the following:

I would like to try buying a ceramic kitchen knife like this

ebay 310099844249

just mostly out of curiosity. Has anyone tried them. Thanks

I bought a 6" chef's knife about 4 years ago and used it happily for
about a year, when I broke it. I was cutting down through a head of
cabbage when it got through the dense core and started speeding down
at the cutting board. As it hit, it shattered at the junction of the
handle, breaking into two pieces. Up until then, I had adored the
thing. While it was just as sharp at the end of the year as it was
new, it is said that they can be honed on diamond plates.

I remain a strong proponent of ceramic knives.


Ig, I have two caveats for you:

1) Shock is your enemy. Don't allow it to hit the cutting board very
hard or fast.

2) The cutting edge is brittle. Don't try to cut bone or attempt to
cut frozen items. And resist rotating the knife in the cut, but
rocking is OK. (I learned anti-rotation with a tiny 1/16" chip, but
the chipped edge is just as sharp, so it didn't diminish the cutting
capacity. (google "flintknapping")

Other than that, they're really great knives. Go for it! The top
brands cost about triple that price.

--
Latin: It's not just for geniuses any more.

On Nov 18, 7:49*am, Larry Jaques
wrote:
On Mon, 17 Nov 2008 20:22:21 -0600, the infamous Ignoramus6517
scrawled the following:

I would like to try buying a ceramic kitchen knife like this

ebay 310099844249

just mostly out of curiosity. Has anyone tried them. Thanks

I bought a 6" chef's knife about 4 years ago and used it happily for
about a year, when I broke it. *I was cutting down through a head of
cabbage when it got through the dense core and started speeding down
at the cutting board. As it hit, it shattered at the junction of the
handle, breaking into two pieces. *Up until then, I had adored the
thing. *While it was just as sharp at the end of the year as it was
new, it is said that they can be honed on diamond plates.

I remain a strong proponent of ceramic knives.

Ig, I have two caveats for you:

1) Shock is your enemy. Don't allow it to hit the cutting board very
hard or fast.

2) The cutting edge is brittle. Don't try to cut bone or attempt to
cut frozen items. *And resist rotating the knife in the cut, but
rocking is OK. (I learned anti-rotation with a tiny 1/16" chip, but
the chipped edge is just as sharp, so it didn't diminish the cutting
capacity. (google "flintknapping")

Other than that, they're really great knives. *Go for it! *The top
brands cost about triple that price.

--
Latin: It's not just for geniuses any more.

Are these similar to the glass knives that were peddled in the 1940's
and 1950's? They had the same keen cutting edge and shattering
problem. Mom wouldn't buy one because they just didn't seem safe.

Paul

In article ,
"Bill Smith" wrote:

"nick hull" wrote in message
...
In article . com,
"Pete C." wrote:

IIRC it is non-metallic
and missed by metal detectors and I believe it is considered 'plastic'
by TSA


Actually, I just saw these made on the "How it's Made" TV show. For security
concerns, they mix a small amount of metal powder in the knife so it Does
set off the metal detectors.

Is that true for knives made in China?

Free men own guns - www(dot)geocities(dot)com/CapitolHill/5357/

On Nov 17, 7:22 pm, Ignoramus6517
wrote:

just mostly out of curiosity. Has anyone tried them. Thanks

Hi Iggy,

I had one and I do a lot of cooking. A friend brought it back from
Japan as a gift for me. It was sharp but it did not slice things like
tomatoes as well as my steel knives. I must say I keep my knives razor
sharp and a bare 20-degree edge. I don't think the ceramic knives can
get that fine an angle without the risk of chipping.

I used it for about 5 weeks and finally went back to steel. I have a
knife made in Brazil and labeled "Surgical Stainless" It holds an edge
for many weeks and I regularly hack through chicken wings cutting up
raw wings for my cat. I use it like a cleaver and it is amazing.

I didn't look at the ebay one but if it is within your disposable
budget then get and try it. I was also given a ceramic blade potato
peeler and that rests untouched after a few weeks trial.

Bill Smith wrote:

"nick hull" wrote in message
...
In article . com,
"Pete C." wrote:

IIRC it is non-metallic
and missed by metal detectors and I believe it is considered 'plastic'
by TSA


Actually, I just saw these made on the "How it's Made" TV show. For security
concerns, they mix a small amount of metal powder in the knife so it Does
set off the metal detectors.

this sounds dubious.

"Cydrome Leader" wrote in message
...
Bill Smith wrote:

"nick hull" wrote in message
...
In article . com,
"Pete C." wrote:

IIRC it is non-metallic
and missed by metal detectors and I believe it is considered 'plastic'
by TSA


Actually, I just saw these made on the "How it's Made" TV show. For
security
concerns, they mix a small amount of metal powder in the knife so it Does
set off the metal detectors.

this sounds dubious.

It does, especially since the usual reason for adding metal powder to
ceramics is to (1) allow lower-temperature sintering, and thus to lower
cost; or (2) to increase toughness. That's what cermet cutting inserts are
all about.

It wouldn't surprise me if they were using cermet technology in knives for
the same reason. It *would* surprise me if they were doing it for metal
detection.

--
Ed Huntress

Ed Huntress wrote:

"Cydrome Leader" wrote in message
...
Bill Smith wrote:

"nick hull" wrote in message
...
In article . com,
"Pete C." wrote:

IIRC it is non-metallic
and missed by metal detectors and I believe it is considered 'plastic'
by TSA


Actually, I just saw these made on the "How it's Made" TV show. For
security
concerns, they mix a small amount of metal powder in the knife so it Does
set off the metal detectors.

this sounds dubious.

It does, especially since the usual reason for adding metal powder to
ceramics is to (1) allow lower-temperature sintering, and thus to lower
cost; or (2) to increase toughness. That's what cermet cutting inserts are
all about.

It wouldn't surprise me if they were using cermet technology in knives for
the same reason. It *would* surprise me if they were doing it for metal
detection.

I've only played with the first generation of Kyocera kitchen knives from
over 10 years ago. I'm pretty sure they were 100% alumina.

They are very sharp and just beg to be broken or chipped. The novelty
factor aside, it's not really clear to me what they offer over a good
carbon steel knife, which nobody seems to sell anymore.

On Tue, 18 Nov 2008 09:06:51 -0800 (PST), the infamous
" scrawled the following:

On Nov 18, 7:49*am, Larry Jaques
wrote:
On Mon, 17 Nov 2008 20:22:21 -0600, the infamous Ignoramus6517
scrawled the following:

I would like to try buying a ceramic kitchen knife like this

ebay 310099844249

just mostly out of curiosity. Has anyone tried them. Thanks

I bought a 6" chef's knife about 4 years ago and used it happily for
about a year, when I broke it. *I was cutting down through a head of
cabbage when it got through the dense core and started speeding down
at the cutting board. As it hit, it shattered at the junction of the
handle, breaking into two pieces. *Up until then, I had adored the
thing. *While it was just as sharp at the end of the year as it was
new, it is said that they can be honed on diamond plates.

I remain a strong proponent of ceramic knives.

Ig, I have two caveats for you:

1) Shock is your enemy. Don't allow it to hit the cutting board very
hard or fast.

2) The cutting edge is brittle. Don't try to cut bone or attempt to
cut frozen items. *And resist rotating the knife in the cut, but
rocking is OK. (I learned anti-rotation with a tiny 1/16" chip, but
the chipped edge is just as sharp, so it didn't diminish the cutting
capacity. (google "flintknapping")

Other than that, they're really great knives. *Go for it! *The top
brands cost about triple that price.

--
Latin: It's not just for geniuses any more.

Are these similar to the glass knives that were peddled in the 1940's
and 1950's? They had the same keen cutting edge and shattering
problem. Mom wouldn't buy one because they just didn't seem safe.

No, I strongly doubt it. These are metallic ceramic called
"zirconia", aka "man-made diamond", which I believe hadn't been
invented back then.

http://en.wikipedia.org/wiki/Glass_knives Tempered glass. Not the
same at all, Paul.

--
Latin: It's not just for geniuses any more.

"Dave, I can't do that" wrote in message
...
On Nov 17, 7:22 pm, Ignoramus6517
wrote:

just mostly out of curiosity. Has anyone tried them. Thanks

Hi Iggy,

I had one and I do a lot of cooking. A friend brought it back from
Japan as a gift for me. It was sharp but it did not slice things like
tomatoes as well as my steel knives. I must say I keep my knives razor
sharp and a bare 20-degree edge. I don't think the ceramic knives can
get that fine an angle without the risk of chipping.

I used it for about 5 weeks and finally went back to steel. I have a
knife made in Brazil and labeled "Surgical Stainless" It holds an edge
for many weeks and I regularly hack through chicken wings cutting up
raw wings for my cat. I use it like a cleaver and it is amazing.

I didn't look at the ebay one but if it is within your disposable
budget then get and try it. I was also given a ceramic blade potato
peeler and that rests untouched after a few weeks trial.



What was the troble with the potato peeler/

By the way, has anyone ever heard of ceramic 3 blade safety razors? I
vaguely recall seeing something about them on a doco a while ago, but
nothing since. Maybe they never wear out. That would leave Gillette in deep
trouble.

"Larry Jaques" wrote in message
...
On Tue, 18 Nov 2008 09:06:51 -0800 (PST), the infamous
" scrawled the following:

On Nov 18, 7:49 am, Larry Jaques
wrote:
On Mon, 17 Nov 2008 20:22:21 -0600, the infamous Ignoramus6517
scrawled the following:

I would like to try buying a ceramic kitchen knife like this

ebay 310099844249

just mostly out of curiosity. Has anyone tried them. Thanks

I bought a 6" chef's knife about 4 years ago and used it happily for
about a year, when I broke it. I was cutting down through a head of
cabbage when it got through the dense core and started speeding down
at the cutting board. As it hit, it shattered at the junction of the
handle, breaking into two pieces. Up until then, I had adored the
thing. While it was just as sharp at the end of the year as it was
new, it is said that they can be honed on diamond plates.

I remain a strong proponent of ceramic knives.

Ig, I have two caveats for you:

1) Shock is your enemy. Don't allow it to hit the cutting board very
hard or fast.

2) The cutting edge is brittle. Don't try to cut bone or attempt to
cut frozen items. And resist rotating the knife in the cut, but
rocking is OK. (I learned anti-rotation with a tiny 1/16" chip, but
the chipped edge is just as sharp, so it didn't diminish the cutting
capacity. (google "flintknapping")

Other than that, they're really great knives. Go for it! The top
brands cost about triple that price.

--
Latin: It's not just for geniuses any more.

Are these similar to the glass knives that were peddled in the 1940's
and 1950's? They had the same keen cutting edge and shattering
problem. Mom wouldn't buy one because they just didn't seem safe.

No, I strongly doubt it. These are metallic ceramic called
"zirconia", aka "man-made diamond", which I believe hadn't been
invented back then.

Zirconia (zirconium dioxide) is not man-made diamond. It's just another
ceramic. Man-made diamond is...man-made diamond. g

Zirconia is the material used to make Mitutoyo's Cerablock gage blocks.


--
Latin: It's not just for geniuses any more.

I see you read those links about Latin. d8-)

--
Ed Huntress

"Larry Jaques" wrote in message
...
On Tue, 18 Nov 2008 09:06:51 -0800 (PST), the infamous
" scrawled the following:

On Nov 18, 7:49 am, Larry Jaques
wrote:
On Mon, 17 Nov 2008 20:22:21 -0600, the infamous Ignoramus6517
scrawled the following:

I would like to try buying a ceramic kitchen knife like this

ebay 310099844249

just mostly out of curiosity. Has anyone tried them. Thanks

I bought a 6" chef's knife about 4 years ago and used it happily for
about a year, when I broke it. I was cutting down through a head of
cabbage when it got through the dense core and started speeding down
at the cutting board. As it hit, it shattered at the junction of the
handle, breaking into two pieces. Up until then, I had adored the
thing. While it was just as sharp at the end of the year as it was
new, it is said that they can be honed on diamond plates.

I remain a strong proponent of ceramic knives.

Ig, I have two caveats for you:

1) Shock is your enemy. Don't allow it to hit the cutting board very
hard or fast.

2) The cutting edge is brittle. Don't try to cut bone or attempt to
cut frozen items. And resist rotating the knife in the cut, but
rocking is OK. (I learned anti-rotation with a tiny 1/16" chip, but
the chipped edge is just as sharp, so it didn't diminish the cutting
capacity. (google "flintknapping")

Other than that, they're really great knives. Go for it! The top
brands cost about triple that price.

--
Latin: It's not just for geniuses any more.

Are these similar to the glass knives that were peddled in the 1940's
and 1950's? They had the same keen cutting edge and shattering
problem. Mom wouldn't buy one because they just didn't seem safe.

No, I strongly doubt it. These are metallic ceramic called
"zirconia", aka "man-made diamond", which I believe hadn't been
invented back then.

Oh, wait, I remember where you got the diamond thing. You're talking about
cubic zirconia, which is a form that's clear crystal, used as artificial gem
diamonds.

It still isn't diamond, man-made or otherwise. But you probably know that.
The ceramic zirconia usually is white.

--
Ed Huntress

Ignoramus6517 wrote:
I would like to try buying a ceramic kitchen knife like this

ebay 310099844249

just mostly out of curiosity. Has anyone tried them. Thanks
You got to be kidding! Made from Zirconia? You
ought to read the warning labels on electronic
gear with zirconia ceramic in them. They
basically tell you to get into a moon suit
whenever touching the component. (Maybe I'm
thinking of the wrong ceramic, or that hazard has
been reevaluated.) Anyway, I suspect if you drop
it, it will be in a million pieces. Not real good
to drop knives anyway. I also suspect the blades
would chip easily. So, don't put them in the
dishwasher.

Jon

On Mon, 17 Nov 2008 21:39:33 -0500, jeff wrote:

On Mon, 17 Nov 2008 20:22:21 -0600, Ignoramus6517
wrote:

I would like to try buying a ceramic kitchen knife like this

ebay 310099844249

just mostly out of curiosity. Has anyone tried them. Thanks



Always Sharp Guarantee:

To sharpen simply mail your Tachi knife back to the distributor with
9.95 for return shipping.

I wonder how often they need sharpening?


jeff


Very seldom, if taken care of. A ceramic knife can be scary scary
sharp, and stay that way a long time.

Just dont drop one on a concrete floor, or even a granite countertop.

Gunner

On Nov 18, 11:14*am, Cydrome Leader wrote:
Bill Smith wrote:

"nick hull" wrote in message
...
In article . com,
"Pete C." wrote:

IIRC it is non-metallic
and missed by metal detectors and I believe it is considered 'plastic'
by TSA

Actually, I just saw these made on the "How it's Made" TV show. For security
concerns, they mix a small amount of metal powder in the knife so it Does
set off the metal detectors.

this sounds dubious.

Some of the ceramic knife companies put a chunk of metal in the handle
for detection purposes.
Karl

On Nov 19, 12:30*am, Jon Elson wrote:
...
You got to be kidding! *Made from Zirconia? *You
ought to read the warning labels on electronic
gear with zirconia ceramic in them. *They
basically tell you to get into a moon suit
whenever touching the component. *(Maybe I'm
thinking of the wrong ceramic, or that hazard has
been reevaluated.) *...
Jon

http://www.zirchrom.com/pdf/NPZMSDS.pdf
Do you mean Beryllium?

Jim Wilkins wrote:
On Nov 19, 12:30 am, Jon Elson wrote:

...
You got to be kidding! Made from Zirconia? You
ought to read the warning labels on electronic
gear with zirconia ceramic in them. They
basically tell you to get into a moon suit
whenever touching the component. (Maybe I'm
thinking of the wrong ceramic, or that hazard has
been reevaluated.) ...
Jon


http://www.zirchrom.com/pdf/NPZMSDS.pdf
Do you mean Beryllium?
I think he means Beryllium Oxide.
...lew...

On Tue, 18 Nov 2008 23:00:23 -0500, the infamous "Ed Huntress"
scrawled the following:

"Larry Jaques" wrote in message

No, I strongly doubt it. These are metallic ceramic called
"zirconia", aka "man-made diamond", which I believe hadn't been
invented back then.

Zirconia (zirconium dioxide) is not man-made diamond. It's just another
ceramic. Man-made diamond is...man-made diamond. g

Zirconia is the material used to make Mitutoyo's Cerablock gage blocks.

And Cubic Zirconia is the trade name of one manmade diamond.


--
Latin: It's not just for geniuses any more.

I see you read those links about Latin. d8-)

Yeah, for kicks. I have a Latin book you might enjoy hearing about.
_How to Insult, Abuse, and Insinuate in Classical Latin_.

--
Latin: It's not just for geniuses any more.

On Wed, 19 Nov 2008 00:04:47 -0500, the infamous "Ed Huntress"
scrawled the following:


Oh, wait, I remember where you got the diamond thing. You're talking about
cubic zirconia, which is a form that's clear crystal, used as artificial gem
diamonds.

It still isn't diamond, man-made or otherwise. But you probably know that.
The ceramic zirconia usually is white.

Right, and now black. The black ceramic knives are sinister looking.
Very cool.

--
Latin: It's not just for geniuses any more.

"Larry Jaques" wrote in message
...
On Tue, 18 Nov 2008 23:00:23 -0500, the infamous "Ed Huntress"
scrawled the following:

"Larry Jaques" wrote in message

No, I strongly doubt it. These are metallic ceramic called
"zirconia", aka "man-made diamond", which I believe hadn't been
invented back then.

Zirconia (zirconium dioxide) is not man-made diamond. It's just another
ceramic. Man-made diamond is...man-made diamond. g

Zirconia is the material used to make Mitutoyo's Cerablock gage blocks.

And Cubic Zirconia is the trade name of one manmade diamond.

Uh, not that I know of. It's the name of an *artificial* diamond. It isn't
diamond, manmade or otherwise. It isn't even carbon.


--
Latin: It's not just for geniuses any more.

I see you read those links about Latin. d8-)

Yeah, for kicks. I have a Latin book you might enjoy hearing about.
_How to Insult, Abuse, and Insinuate in Classical Latin_.

My son probably would enjoy that. g

--
Ed Huntress

"Larry Jaques" wrote in message
...
On Wed, 19 Nov 2008 00:04:47 -0500, the infamous "Ed Huntress"
scrawled the following:


Oh, wait, I remember where you got the diamond thing. You're talking about
cubic zirconia, which is a form that's clear crystal, used as artificial
gem
diamonds.

It still isn't diamond, man-made or otherwise. But you probably know that.
The ceramic zirconia usually is white.

Right, and now black. The black ceramic knives are sinister looking.
Very cool.

Are you sure they're zirconia? Black is usually aluminum oxide. In
high-performance engineering applications, black may be silicon nitride.

I'll bet they're aluminum oxide (alumina).

--
Ed Huntress


--
Latin: It's not just for geniuses any more.

"Ed Huntress" wrote in message
...

"Larry Jaques" wrote in message
...
On Wed, 19 Nov 2008 00:04:47 -0500, the infamous "Ed Huntress"
scrawled the following:


Oh, wait, I remember where you got the diamond thing. You're talking
about
cubic zirconia, which is a form that's clear crystal, used as artificial
gem
diamonds.

It still isn't diamond, man-made or otherwise. But you probably know
that.
The ceramic zirconia usually is white.

Right, and now black. The black ceramic knives are sinister looking.
Very cool.

Are you sure they're zirconia? Black is usually aluminum oxide. In
high-performance engineering applications, black may be silicon nitride.

I'll bet they're aluminum oxide (alumina).

--
Ed Huntress


--
Latin: It's not just for geniuses any more.

my aluminium oxide blasting medium is brown. my silicon carbide blasting
medium is black.

does al2o3 come in black too, and is it harder than brown al2o3?

Ed Huntress wrote:
Right, and now black. The black ceramic knives are sinister looking.
Very cool.

Are you sure they're zirconia? Black is usually aluminum oxide. In
high-performance engineering applications, black may be silicon nitride.

I'll bet they're aluminum oxide (alumina).

--
Ed Huntress

--
Latin: It's not just for geniuses any more.



Nope, It is Zirconium Carbide.
They press the blades from Zirconium Oxide powder, Then they fire them
at 14-1500 degrees for a few hours. These blades will be white at this
time,if you wanted a white ceramic this is what you would get. If you
wanted a black blade they run it through a second process called hot
isostatic pressing. During this process the zirconium oxide changes to
zirconium carbide, and you now have a black blade. The trade off it that
the black blades are a bit stronger than the white ones BUT they don't
hold an edge as long.

--
Steve W.


----== Posted via Pronews.Com - Unlimited-Unrestricted-Secure Usenet News==----
http://www.pronews.com The #1 Newsgroup Service in the World! 100,000 Newsgroups
---= - Total Privacy via Encryption =---

"charlie" wrote in message
...

"Ed Huntress" wrote in message
...

"Larry Jaques" wrote in message
...
On Wed, 19 Nov 2008 00:04:47 -0500, the infamous "Ed Huntress"
scrawled the following:


Oh, wait, I remember where you got the diamond thing. You're talking
about
cubic zirconia, which is a form that's clear crystal, used as artificial
gem
diamonds.

It still isn't diamond, man-made or otherwise. But you probably know
that.
The ceramic zirconia usually is white.

Right, and now black. The black ceramic knives are sinister looking.
Very cool.

Are you sure they're zirconia? Black is usually aluminum oxide. In
high-performance engineering applications, black may be silicon nitride.

I'll bet they're aluminum oxide (alumina).

--
Ed Huntress


--
Latin: It's not just for geniuses any more.

my aluminium oxide blasting medium is brown. my silicon carbide blasting
medium is black.

does al2o3 come in black too, and is it harder than brown al2o3?

It comes in black, but I don't know if it's harder. IIRC it's tougher. There
also is white AlOx, and pink.

The black, if my vague and fleabitten memory still works, contains small
amounts of some ferrous compound.

--
Ed Huntress

"Steve W." wrote in message ...
Ed Huntress wrote:
Right, and now black. The black ceramic knives are sinister looking.
Very cool.

Are you sure they're zirconia? Black is usually aluminum oxide. In
high-performance engineering applications, black may be silicon nitride.

I'll bet they're aluminum oxide (alumina).

--
Ed Huntress

--
Latin: It's not just for geniuses any more.



Nope, It is Zirconium Carbide.
They press the blades from Zirconium Oxide powder, Then they fire them at
14-1500 degrees for a few hours. These blades will be white at this
time,if you wanted a white ceramic this is what you would get. If you
wanted a black blade they run it through a second process called hot
isostatic pressing. During this process the zirconium oxide changes to
zirconium carbide, and you now have a black blade.

Wow, HIPping is pretty fancy for a knife blade. That used to be reserved for
things like jet turbine blades.

Where does the carbon come from to react with the zirconium oxide?

--
Ed Huntress

On Wed, 19 Nov 2008 15:41:32 -0500 in rec.crafts.metalworking, "Ed
Huntress" wrote,
"Larry Jaques" wrote in message
.. .
And Cubic Zirconia is the trade name of one manmade diamond.

Uh, not that I know of. It's the name of an *artificial* diamond. It isn't
diamond, manmade or otherwise. It isn't even carbon.

"Artificial" is pretty much just another word for "man-made".
I would call it imitation diamond or diamond substitute.

Larry Jaques wrote:

And Cubic Zirconia is the trade name of one manmade diamond.

I think thats called "paste" in the jewlery business. :-)
...lew...

Ed Huntress wrote:


Are you sure they're zirconia? Black is usually aluminum oxide. In
high-performance engineering applications, black may be silicon nitride.

I'll bet they're aluminum oxide (alumina).

--
Ed Huntress

Or Saphire in the crystal form. Al O
2 3
...lew...

"David Harmon" wrote in message
m...
On Wed, 19 Nov 2008 15:41:32 -0500 in rec.crafts.metalworking, "Ed
Huntress" wrote,
"Larry Jaques" wrote in message
. ..
And Cubic Zirconia is the trade name of one manmade diamond.

Uh, not that I know of. It's the name of an *artificial* diamond. It isn't
diamond, manmade or otherwise. It isn't even carbon.

"Artificial" is pretty much just another word for "man-made".
I would call it imitation diamond or diamond substitute.

Man-made diamond, like GE's crystalline diamond used for diamond compact
tools, and the vapor-deposited synthetic diamond used for coating tools, is
real diamond. Chemically, it's indistinguishable from natural diamond. It's
carbon, and it's just as hard as natural diamond.

Cubic zirconia and other artificial diamonds are not diamonds at all.
They're completely different compounds, and they're somewhat softer than
diamond. Zirconia, for example, is zirconium dioxide.

Now that man-made, or synthetic diamonds are so common, it's good to
distinguish them from the artificial stones that only *look* like diamonds.
The synthetics, again, are real diamonds. They can even make some
gem-quality synthetic diamonds today.

--
Ed Huntress

On Wed, 19 Nov 2008 07:14:36 -0700, the renowned Lew Hartswick
wrote:

Jim Wilkins wrote:
On Nov 19, 12:30 am, Jon Elson wrote:

...
You got to be kidding! Made from Zirconia? You
ought to read the warning labels on electronic
gear with zirconia ceramic in them. They
basically tell you to get into a moon suit
whenever touching the component. (Maybe I'm
thinking of the wrong ceramic, or that hazard has
been reevaluated.) ...
Jon


http://www.zirchrom.com/pdf/NPZMSDS.pdf
Do you mean Beryllium?
I think he means Beryllium Oxide.
...lew...

Yup, BeO. Harmless unless you grind it up and breath it in.

But then drill rod is harmless unless you do something like sharpen it
to a point and plunge it into your eye.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com

Ed Huntress wrote:
...
Now that man-made, or synthetic diamonds are so common, it's good to
distinguish them from the artificial stones that only *look* like diamonds.
The synthetics, again, are real diamonds. They can even make some
gem-quality synthetic diamonds today.

Here's an interesting article about synthetic vapor-deposition diamonds:
http://www.newscientist.com/article/...tra-large.html

They are producing gem quality up to 34 carat! With an improved process
that will allow much larger "... to kilocarat diamonds of high optical
quality". De Beers must be having nightmares!

Astonishingly: " ...600 tonnes of synthetic diamonds are produced each
year for industrial use alone ..."

Bob

On 2008-11-19, Jon Elson wrote:
Ignoramus6517 wrote:
I would like to try buying a ceramic kitchen knife like this

ebay 310099844249

just mostly out of curiosity. Has anyone tried them. Thanks
You got to be kidding! Made from Zirconia? You
ought to read the warning labels on electronic
gear with zirconia ceramic in them. They
basically tell you to get into a moon suit
whenever touching the component. (Maybe I'm
thinking of the wrong ceramic,

I think so. This sounds more like the beryllium ceramic used
for hybrid integrated circuits at one time.

Enjoy,
DoN.

--
Email: | Voice (all times): (703) 938-4564
(too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
--- Black Holes are where God is dividing by zero ---

Jim Wilkins wrote:
On Nov 19, 12:30 am, Jon Elson wrote:
...
You got to be kidding! Made from Zirconia? You
ought to read the warning labels on electronic
gear with zirconia ceramic in them. They
basically tell you to get into a moon suit
whenever touching the component. (Maybe I'm
thinking of the wrong ceramic, or that hazard has
been reevaluated.) ...
Jon

http://www.zirchrom.com/pdf/NPZMSDS.pdf
Do you mean Beryllium?
YES, yes, yes, that's what I was thinking! I knew
I must have been off-base on that.

Thanks for the correction!

Jon

"Bob Engelhardt" wrote in message
...
Ed Huntress wrote:
...
Now that man-made, or synthetic diamonds are so common, it's good to
distinguish them from the artificial stones that only *look* like
diamonds. The synthetics, again, are real diamonds. They can even make
some gem-quality synthetic diamonds today.

Here's an interesting article about synthetic vapor-deposition diamonds:
http://www.newscientist.com/article/...tra-large.html

They are producing gem quality up to 34 carat! With an improved process
that will allow much larger "... to kilocarat diamonds of high optical
quality". De Beers must be having nightmares!

Wow! DeBeers, the ballgame is about over.


Astonishingly: " ...600 tonnes of synthetic diamonds are produced each
year for industrial use alone ..."

Bob

Yeah, that volume has been climbing, and products like diamond hones are
getting to be pretty common.

--
Ed Huntress