Aluminum nitride-based sintered body and process for the product

Details Aluminum nitride-based sintered body and process for the product Aluminum nitride-based sintered body and process for the product

1988-01-29

1991-12-31

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

501 98, 501152, C04B 3558

Patent

active

050772457

ABSTRACT:
An aluminum nitride-based sintered body having a thermal conductivity of greater than 110 W/mK and a relative density of at least 90% and a process for the production thereof are disclosed. The sintered body contains minor amounts of at least one compound of a Group IIa metal and at least one compound of a Group IIIa metal of the Periodic Table and can be produced from an aluminum nitride starting powder prepared by direct nitriding of metallic aluminum powder and having a purity of at least 99%, an oxygen content of lower than 1.8%, and an Si content of at most 1.0% by mixing the starting powder with powdery sintering additives consisting of at least one metal or compound of a Group IIa metal such as Ca and at least one metal or compound of a Group IIIa metal such as Y, shaping the powder mixture, and baking the shaped mixture at a relatively low temperature.

REFERENCES:
patent: 4591537 (1986-05-01), Aldinger et al.
patent: 4698320 (1987-10-01), Kasori et al.
patent: 4711861 (1987-12-01), Sawamuna et al.
patent: 4719187 (1988-01-01), Bardhan et al.

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