Sintered aluminum nitride

Details Sintered aluminum nitride Sintered aluminum nitride

1997-06-23

1999-02-23

Marcheschi, Michael

Compositions: ceramic

Ceramic compositions

Refractory

501 985, 501152, 501153, 501154, C04B 35581

Patent

active

058743782

ABSTRACT:
A sintered aluminum nitride contains rare earth elements (RE) in amounts of from 3 to 10% by weight in terms of RE.sub.2 O.sub.3, alkaline earth elements (R) in amounts of from 0.3 to 3.0% by weight in terms of RO, and silicon atoms in an amount of from 0.3 to 1.0% by weight in terms of SiO.sub.2, the grain boundaries of AlN crystals being chiefly a YAG type crystalline phase. The sintered product is obtained by firing at a temperature as low as 1700.degree. C. or lower, has a thermal conductivity of not smaller than 60 W/m.cndot.K, loses weight in an amount of not more than 10 mg/cm.sup.2 when it is left to stand in a 4N NaOH aqueous solution maintained at 70.degree. C. for one hour, and exhibits excellent resistance against the alkalis.

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patent: 5077245 (1991-12-01), Miyahara
patent: 5314850 (1994-05-01), Miyahara
patent: 5508240 (1996-04-01), Komatsu et al.
patent: 5641718 (1997-06-01), Horiguchi et al.

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