C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
25/142, 402/510
C04B 35/00 (2006.01) C04B 35/58 (2006.01) C04B 35/584 (2006.01) C04B 35/591 (2006.01) C04B 35/634 (2006.01)
Patent
CA 1250083
ABSTRACT A polymeric processing aid is disclosed for compaction of ceramic or ceramic-forming powders at ambient temperatures and at pressures in excess of 15,000 psi and at impact rates of 12-44 strokes/minute without altering the chemical/physica1 properties of the resulting ceramic. The processing aid comprises a polymerized acrylate or mixed acrylate/methacrylate monomer which has been polymerized; the polymer is selected to have a Tg of at least 50°C below room temperature, a molar cohesive energy of 7000-20,000 cal/mole. a number average molecular weight of 4000-20,000, a surface tension less than 35 dyne/cm, and a viscous liquid physical form at room temperature. A method of using such processing aid is also disclosed. The method comprises mixing silicon powder with oxygen-carrying agents (Y2O3, Al2O3 SiO2) in the amount of 4-19% by weight of the mixture along with 2-3.5% by weight of the processing aid. The mixture is subjected to high speed cold-compaction at pressures in excess of 15,000 psi with an impact rate of 12-44 strokes/minute. The compacted and ejected cold-pressed body is heat treated to form a dense Si3N4 object.
497105
Beckwith Elaine C.
Ezis Andre
Ford Motor Company Of Canada Limited
Sim & Mcburney
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