On Thu, 12 Apr 2018 00:37:18 -0500, wrote:

I thought I'd post this to see if anyone has used this for
semiconductors on heat sink, grease, or is there some reason NOT to use
this stuff for that purpose?

The best way to use thermal goo is to have the heat sink and device
touch each other with direct metal to metal contact, and with whatever
thermal goo you select filling in only the gaps. Making a thermal
sandwich with a thick layer of thermal goo which prevents direct
contact doesn't work very well. Idea is to grind flat and mirror
polish the heat sink and whatever is getting hot to get more metal to
metal contact, and use very little thermal goo. Some CPU's and video
chips have a mirror finish.

However, if you want to roll your own, diamonds are your best friend.
Here's a list of thermal conductivity of various compounds and
concoctions.
W/m*K
Diamond 1000
h-BN 600 (boron nitride)
c-BN 740 (boron nitride)
Silver 406
Copper 385
Gold 314
AlN 285 (aluminum nitride ceramic)
Aluminum 205
Graphite 200
Carbon 150
SiC 120 (silicon carbide)
Brass 109
ZnO 50 (zinc oxide)
Al2O3 25 (aluminum oxide ceramic)
TiO2 10 (titanium dioxide)

The common white thermal grease is zinc oxide, aluminum oxide, or
both. The expensive stuff adds boron nitride. The clear stuff is
just the grease, which is totally useless for thermal conduction but
might be a handy carrier if you want you mix your own using various
powders.

Tooth paste is the most common "alternative" thermal goo, although sun
screen which contains zinc oxide and perhaps titanium oxide should
also work.

If you can used and control a conductive thermal goo, try "liquid
metal", and alloy of bismuth and indium:
https://www.gamersnexus.net/guides/3064-intels-thermal-problem-pt1-liquid-metal-vs-thermal-paste-benchmarks-7900x
http://www.thermal-grizzly.com/en/products/26-conductonaut-en

Good luck.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558