Synthesis of a TiCN-SiC polyhedron and elongated crystals nanopowder at low nitrogen concentration

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• 作者：A. Engstr&ouml ; m^a ; ^{apbtboy@hotmail.com} ; J. Mouzon^b ; ^{johanne.mouzon@ltu.se} ; J.M. Có ; rdoba^c ; ^{jmcordoba@icmse.csic.es} ; R. Tegman^a ; ^{ragnar.tegman@chemrec.se} ; M-L. Antti^a ; ^{marta-lena.antti@ltu.se}
• 关键词：Nanocomposites ; Nanocrystalline materials ; Powder technology
• 刊名：Materials Letters
• 出版年：2012
• 期刊代码：59_0167577x
• 类别：ms
• 出版时间：15 August, 2012
• 卷：81
• 期：Complete
• 页码：148-150
• 文件大小：565 K

摘要

At room temperature diluted TiCl₄ and CCl₄ were reduced by sodium particles and mixed with a polycarbomethylsilane (PCS) solution to yield a precursor. It was dried and subsequently annealed at 1300 掳C, 1400 掳C and 1450 掳C in a tube furnace using argon with 10 ppm N₂. After the 1450 掳C annealing a nanocrystalline powder of TiC_0.5N_0.5-SiC polyhedron and elongated crystals was obtained. At the low nitrogen concentration during annealing a gradual nitration is proposed. It is promoted by carbon gaseous species, precursor oxidation, a sufficient temperature and a summarised nitrogen surplus compared to the titanium and carbon amount.