发明名称 |
Process for production of cubic boron nitride |
摘要 |
In synthesizing cubic boron nitride from hexagonal boron nitride under high temperature and high pressure conditions, if water is incorporated into the raw material in an amount of at least 3% by weight, cubic boron nitride of a higher purity in the form of smaller crystallites than in conventional products can be obtained under lower temperature and lower pressure conditions than in conventional methods. When graphitic hexagonal boron nitride is used as the raw material, the temperature and pressure necessary for synthesis can be reduced to about 600 DEG C. and 50 Kbar, respectively.
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申请公布号 |
US4016244(A) |
申请公布日期 |
1977.04.05 |
申请号 |
US19750543430 |
申请日期 |
1975.01.23 |
申请人 |
HITACHI, LTD. |
发明人 |
SUSA, KENZO;KOBAYASHI, TOSHIO;TANIGUCHI, SATOSHI;ISHII, MITSURU |
分类号 |
C01B21/064;C04B35/5831;(IPC1-7):C01B35/14 |
主分类号 |
C01B21/064 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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