pjh@mccc.uucp (Pete Holsberg) (10/07/90)
What's a good conducting adhesive that I can use to stick a heat sink to the top of a large IC? Thanks, Pete -- Prof. Peter J. Holsberg Mercer County Community College Voice: 609-586-4800 Engineering Technology, Computers and Math UUCP:...!princeton!mccc!pjh 1200 Old Trenton Road, Trenton, NJ 08690 Internet: pjh@mccc.edu Trenton Computer Festival -- 4/20-21/91
jgd@rsiatl.UUCP (John G. DeArmond) (10/08/90)
pjh@mccc.uucp (Pete Holsberg) writes: >What's a good conducting adhesive that I can use to stick a heat sink to the >top of a large IC? I have a nice little kit here from Thermalloy, Inc called a "Thermalbond 4951". The kit contains a jar of green epoxee goop and a smaller bottle of activator liquid. It mixes at the ratio of 100 parts of resin to 7.5 parts of hardner (got that? :-) and sets up in 24 hours at ambient or 30 minutes at 130 degrees C. It also recommends a post cure of 4 days or 4 hours at 200 degrees F. I cure it for about an hour in an oven at about 250 degrees and it works well. It sets up to a bright green, very hard and very conductive mass. I bought the stuff surplus at a hamfest for $3.00 a kit. It has a shelf life but the fact that mine is several years out of date does not seem to affect its performance. The address on the box for Thermalloy is: PO Box 340839 2021 West Valley View Lane Dallas, TX 75234 214 243 4321 -- John De Armond, WD4OQC | We can no more blame our loss of freedom on congress Radiation Systems, Inc. | than we can prostitution on pimps. Both simply Atlanta, Ga | provide broker services for their customers. {emory,uunet}!rsiatl!jgd| - Dr. W Williams | **I am the NRA**
whit@milton.u.washington.edu (John Whitmore) (10/09/90)
In article <1990Oct7.155829.3917@mccc.uucp> pjh@mccc.uucp (Pete Holsberg) writes: >What's a good conducting adhesive that I can use to stick a heat sink to the >top of a large IC? > Assuming you mean heat-conducting, RTV silicone is a good adhesive for this sort of thing. The important thermal resistance is not likely to be the adhesive (its path length, the thickness of the glue, is short), but rather the package of the IC. While 'loaded' adhesives have better conductivity (we've used copper powder/epoxy mixes here, for our cryostat work), the plain ol' gunk from the tube is entirely adequate. John Whitmore