Sintered product of aluminum nitride, a process for the preparat

Details Sintered product of aluminum nitride, a process for the preparat Sintered product of aluminum nitride, a process for the preparat

1993-09-07

1994-12-27

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

C04B 3558

Patent

active

053766016

ABSTRACT:
A molded article is prepared from an AlN powder of a high purity without adding sintering assistant, baked in a nitrogen atmosphere without containing carbon, and is further heat-treated in a nitrogen atmosphere containing carbon in order to remove impurities in the sintered product. There is obtained a highly pure and dense sintered product which comprises mainly a phase of aluminum nitride, which has an average grain size of greater than 9 .mu.m, cationic metal impurities other aluminum, and Si, Fe and Ca in amounts smaller than predetermined values. The sintered product exhibits a very small creep rate when stress is applied thereto at high temperatures and is used as a material for high temperature uses such as a baking jig. Owing to its excellent anti-creeping property at high temperatures, tile product is suitably used as a structural material subject to stress at high temperatures for extended periods of time. When used as a baking jig, in particular, the sintered product does not adversely affect the molded articles and exhibits excellent durability.

REFERENCES:
patent: 4847221 (1989-07-01), Horiguchi et al.
patent: 4908173 (1990-03-01), Schwetz et al.
patent: 4983462 (1991-01-01), Hiai et al.
patent: 5219803 (1993-06-01), Yamakawa et al.
patent: 5264388 (1993-11-01), Yamakawa et al.

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