发明名称 |
Boron-containing ceramics through the chemical conversian of borane-containing polymers |
摘要 |
A process for producing boron-containing ceramics such as boron carbide and boron nitride comprises pyrolyzing a blend of a precarbonaceous polymer such as polyacrylonitrile and a boron-containing polymer such as that formed by the reaction of a borane with a Lewis base. Pyrolyzation in an inert atmosphere yields boron carbide while pyrolyzation in a reactive gas burns away the precarbonaceous polymer and yiels a ceramic comprising the reaction product of boron and the pyrolyzation gas. Boron nitride ceramics are formed by pyrolyzing the preceramic blend in ammonia.
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申请公布号 |
US4832895(A) |
申请公布日期 |
1989.05.23 |
申请号 |
US19870082761 |
申请日期 |
1987.08.07 |
申请人 |
HOECHST CELANESE CORPORATION |
发明人 |
JOHNSON, ROBERT E. |
分类号 |
C04B35/563;C04B35/583;C04B35/622;D01F9/10 |
主分类号 |
C04B35/563 |
代理机构 |
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代理人 |
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地址 |
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