Compositions: ceramic – Ceramic compositions – Refractory
Patent
1984-07-11
1985-08-06
McCarthy, Helen M.
Compositions: ceramic
Ceramic compositions
Refractory
264 65, 423412, 501 98, C04B 3558
Patent
active
045336458
ABSTRACT:
The process comprises forming a mixture comprised of aluminum nitride powder and free carbon wherein the aluminum nitride has a predetermined oxygen content higher than about 0.8% by weight and wherein the amount of free carbon reacts with such oxygen content to produce a deoxidized powder or compact having an oxygen content ranging from greater than about 0.35% by weight to about 1.1% by weight and which is at least 20% by weight lower than the predetermined oxygen content, heating the mixture or a compact thereof to react the carbon and oxygen producing the deoxidized aluminum nitride, and sintering a compact of the deoxidized aluminum nitride producing a ceramic body having a density greater than 85% of theoretical and a thermal conductivity greater than 0.5 W/cm.multidot.K. at 22.degree. C.
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patent: 3261667 (1966-07-01), O'Connor
patent: 4152182 (1979-05-01), Rutz
patent: 4203733 (1980-05-01), Tanaka et al.
patent: 4435513 (1984-03-01), Komeya et al.
patent: 4478785 (1984-10-01), Huseby et al.
Chem. Abstracts, 99: 26974q and 26975r, Jul. 25, 1983.
Circular, Gem-680, Aluminum Nitride, 2 pages, Jun. 1981.
Bobik Carl F.
Huseby Irvin C.
Binkowski Jane M.
Davis Jr. James C.
General Electric Company
Magee Jr. James
McCarthy Helen M.
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