发明名称 |
Hexagonal boron nitride having a reduced content of water soluble boron-containing impurities, and process for its production. |
摘要 |
A hexagonally crystalline boron nitride containing water-soluble boron containing impurity in such a magntidue that amount of boron to be contained in an extract after boiling at 100 DEG C of pure water is less than or equal to 100 mu g/g-BN. In order to purify the boron nitride, a purification process is carried out according to the steps of preparing fine particles of boron nitride powder; dispersing the boron nitride powder in a disperser and stirred for a given period of time for removing water-soluble boron containing impurity; and drying the boron nitride in an atmosphere, in which vapor pressure is maintained lower than or equal to 10 mmHG and/or the process temperature is maintained lower than or equal to 100 DEG C.
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申请公布号 |
EP0288645(A1) |
申请公布日期 |
1988.11.02 |
申请号 |
EP19870400994 |
申请日期 |
1987.04.29 |
申请人 |
KAWASAKI STEEL CORPORATION |
发明人 |
KOSHIDA, TAKAHISA C/O TECHNICAL RESEARCH DIVISION;UCHIMURA, RYOJI C/O TECHNICAL RESEARCH DIVISION;OGASAWARA, TAKESHI C/O TOKYO HEAD OFFICE |
分类号 |
C01B21/064;(IPC1-7):C01B21/064 |
主分类号 |
C01B21/064 |
代理机构 |
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主权项 |
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地址 |
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