Kaiser wrote:

"Chris" ] wrote in message
]...
Just seen some knives in Tesco that allegedly never need sharpening!
Scam? Or possible? What's the technology?

Probably Titanium coated knife edges, they will stay reasonably sharp for a
long time but when they eventualy go dull you will not be able to sharpen
them.

Titanium Nitride is a golden colour, and forms a wear resistant and fairly
slippery coating.
You can sharpen, but you're then back to the base metal.

Titanium (metal) doesn't make good knives, and is only used in very unusual
circumstances - diving knives, where its seawater resistance is needed, for
example.

Titanium (metal) coating is never (?) used on cutting tools, as titanium
isn't really any good for that.


They may be saw-edged ones, which though they will cut and go on cutting
things for a longer time than a straight blade, will not produce as clean
a cut.
You can't just chop with them (when slightly blunt) but need to saw.