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首页> 外文会议>International conference on high temperature materials chemistry >HIGH TEMPERATURE PYROLYSIS OF PRECERAMIC POLYMERS TO MICROPOROUS AMORPHOUS CERAMICS
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HIGH TEMPERATURE PYROLYSIS OF PRECERAMIC POLYMERS TO MICROPOROUS AMORPHOUS CERAMICS

机译：高温聚合物对微孔非晶陶瓷的高温热解

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Pyrolysis of preceramic polymer precursor (PCP's) as a route to nonoxide ceramics has been studied for over thirty years. Typically, however, the emphasis has been on structural applications as ceramic fibers, coatings or as infiltration media for monolithic or ceramic-fiber reinforced ceramics. This paper presents data on five methods recently discovered for the synthesis of microporous nonoxide ceramics, with surface area up to 780m~2/gm and micropore volume up to 0.28cm~3/gm, by PCP pyrolysis. Pyrolysis of pure PCP's in ammonia produces microporous materials stable over a pyrolysis temperature range of 500-1000 deg C, whereas pyrolysis of pure PCP's in inert gas yields microporous materials only over a limited range of pyrolysis temperatures from about 425-625 deg C. Micropore neck closure is postulated as the mechanism limiting temperature stability.
机译：将培养聚合物前体（PCP）的热解作为一条向非氧化物陶瓷的途径进行了三十多年。然而，通常，重点在于结构应用作为陶瓷纤维，涂层或作为整体或陶瓷 - 纤维增强陶瓷的渗透介质。本文介绍了最近为合成微孔壬氧化物陶瓷的五种方法的数据，表面积高达780m〜2 / gm，微孔体积高达0.28cm〜3 / gm，通过PCP热解。氨氨纯PCP的热解产生微孔材料在500-1000℃的热解温度范围内稳定，而纯PCP在惰性气体中的热解仅在约425-625℃微孔的有限的热解温度范围内产生微孔材料颈部闭合被假设为限制温度稳定的机制。

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