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Si3N4/SiC nanocomposite powder from a preceramic polymeric network based on poly(methylsilane) as the SiC precursor

机译:基于聚甲基硅烷作为SiC前驱体的陶瓷前聚合物网络中的Si3N4 / SiC纳米复合粉末

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摘要

Si3N4/SiC nanocomposite powders were obtained from a preceramic polymeric network based on poly(methylsilane) as the in situ quasi-stoichiometric SiC source. These powders were constituted of nanosized SiC particles homogeneously distributed in the Si3N4 particulate matrix. beta-SiC whiskers were grown at 1400 °C in the pores of the matrix. At 1600 °C, the alpha -> beta Si3N4 phase transition took place, but no elemental silicon from Si3N4 decomposition was detected, evidencing the protective effect of the SiC phase.
机译:从基于聚(甲基硅烷)作为原位准化学计量SiC源的陶瓷前聚合物网络获得了Si3N4 / SiC纳米复合粉末。这些粉末由均匀分布在Si3N4颗粒基质中的纳米级SiC颗粒组成。 β-SiC晶须在1400°C的基质孔中生长。在1600°C时,发生了α->βSi3N4相变,但未检测到Si3N4分解产生的元素硅,证明了SiC相的保护作用。

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