Modification of perhydropolysilazane with aluminum hydride: Preparation of poly(aluminasilazane)s and their conversion into Si–Al–N–C ceramics

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• 作者：Ryoji Toyoda ; Satoshi Kitaoka ; Yoshiyuki Sugahara
• 关键词：Precursors-organic ; Composites ; X-ray methods ; Carbides ; Nitrides
• 刊名：Journal of the European Ceramic Society
• 出版年：2008
• 出版时间：2008
• 年：2008
• 卷：28
• 期：1
• 页码：271-277
• 全文大小：529 K

文摘

Perhydropolysilazane (PHPS) was modified with trimethylamine–alane adduct, AlH₃·NMe₃, with two nominal Si/Al molar ratios (1 and 5), and the resulting poly(aluminasilazane)s were pyrolyzed under an N₂ atmosphere. Poly(aluminasilazane) with a nominal Si/Al molar ratio of 5 (PAS5) was insoluble because of the formation of cross-link points via dehydrocoupling. In the system with a nominal Si/Al molar ratio of 1 (PAS1), on the contrary, AlH₃·NMe₃ cleaved the Si–N bonds in addition to forming Al–N bonds, drastically modifying the Si–N backbone of PHPS. In addition, a large portion of aluminium was lost in the PAS1 preparation. Thermogravimetric analysis revealed that PAS5 exhibited a ceramic yield of 78 % up to 900 °C, while the ceramic yield for PAS1 was 61 % . The XRD patterns of the pyrolyzed residues from PAS1 and PAS5 suggest the formation of a 2H wurtzite-type compound and silicon nitride.