Compositions: ceramic – Ceramic compositions – Refractory
Patent
1994-02-01
1995-10-17
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Refractory
501153, 423412, C04B 35581
Patent
active
054591139
ABSTRACT:
A sinterable aluminum nitride powder composition is prepared by adding about 0.05-10.0 parts by weight of at least one compound selected from the group consisting of calcium tungstate and calcium molybdate and optionally about 1.0-7.0 parts by weight of at least one compound selected from the group consisting of yttria, calcium oxide, and calcium carbonate to 100 parts by weight of an aluminum nitride powder prepared by the alumina reduction method without decarbonization and having a residual carbon content of about 2%-10% by weight. The resulting powdery composition is subjected to mixing and deagglomeration in a dry process so as to form a powder mixture having a bulk density of about 0.3-0.5 g/cm.sup.3, and then to decarbonization by heating in an oxidizing atmosphere. The aluminum nitride powder composition has a pressurized bulk density of about 1.50-1.75 g/cm.sup.3 as measured at a pressure of 500 kg/cm.sup.2 and an average particle diameter of about 1.0-3.0 .mu.m in which particles having a diameter of 5 .mu.m or larger comprise not greater than about 10% by weight of the powder composition. It is capable of forming a colored sintered body with little or no unevenness of color and sintering, and is also capable of forming green sheets which can be used in the manufacture of a multilayered substrate by the green sheet laminating technology with a minimized tendency toward delamination during sintering.
REFERENCES:
patent: 4578365 (1986-03-01), Huseby et al.
patent: 4843038 (1989-06-01), Kuratani et al.
patent: 4877760 (1989-10-01), Okuno et al.
patent: 5049367 (1991-09-01), Nakano et al.
patent: 5110575 (1992-05-01), Wakimura et al.
patent: 5154863 (1992-10-01), Miyahara
patent: 5294388 (1994-03-01), Shimoda et al.
patent: 5306679 (1994-04-01), Shimoda et al.
Iwase Hiroshi
Nozaki Toshio
Oguni Masanori
Ohiwa Seigo
Bell Mark L.
Marcheschi Michael
Sumitomo Metal Ceramics Inc.
LandOfFree
Aluminum nitride powder capable of forming colored sintered body does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Aluminum nitride powder capable of forming colored sintered body, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Aluminum nitride powder capable of forming colored sintered body will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-597227