发明名称 |
ALUMINA POWDER AND METHOD FOR PREPARING THE SAME AS WELL AS USE THEREOF |
摘要 |
Herein disclosed is alumina powder incorporated into a composition which should have excellent heat conduction and used as a heat-radiating member and for sealing a semiconductor. The spherical α-alumina powder has an average sphericity of not less than 0.93 and a content of α-crystalline form is not less than 95% and the spherical α-alumina powder is prepared according to the method, which comprises the steps of: (1) softening metallic aluminum powder or alumina powder through the treatment with a flame; (2) solidifying the softened powder by passing the same through a zone maintained at a temperature ranging from 800 to 500° C.; (3) increasing the content of α-phase by passing the solidified powder through a zone maintained at a temperature ranging from 950 to 1,500° C.; and (4) collecting the resulting powdery product while cooling the same.
|
申请公布号 |
US2010051855(A1) |
申请公布日期 |
2010.03.04 |
申请号 |
US20090447660 |
申请日期 |
2009.04.29 |
申请人 |
DENKI KAGAKU KOGYO KABUSHIKI KAISHA |
发明人 |
KUNITOMO OSAMU;TANAKA TAKAAKI |
分类号 |
C09K5/00;C01F7/02 |
主分类号 |
C09K5/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|