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Date: 08/27/99
Posted by: karl woerner
E-mail: kwoerner(at)harris(dot)com(no spam)
URL: http://

Colleagues, I am searching for a material that can be for use as a mounting platform. My requirements are as follows: 1. low coefficient of thermal expansion 2. chemical resistance to sulfuric acid 3. bondability (with epoxy) 4. Ability to withstand thermal shock in a relatively narrow temperature band (-20° to 175° C) The problem is the tolerances that I require. The platform will be small, only 1.50” x .188” x .063”. A rectangular pocket 1.000” x .094” x .030” will be formed in the top face. A slot .0110 +- .0005 must be cut lengthwise through the pocket and down the entire length of the part. Another slot of the same width and tolerance must be cut across the bottom of the .094” pocket only. Two location holes of diameter .060 or smaller +.0002 -.0000 must me formed in the top face as well. Quartz would be ideal, but I have been unable to find a machinist that can hold those tolerances in glass for any price. MACOR by corning has been rejected due to its brittleness. Ceramics would work if I could find a way to incorporate my geometry without introducing porosity. If anyone knows of a suitable material and fabrication technique please reply to kwoerner@harris.com . Your assistance will be greatly appreciated. Regards, Karl Woerner

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