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|Type:||Artigo de evento|
|Title:||Poly(borosilazanes) As Precursors Of Si - B - C - N Glasses: Synthesis And High Temperature Properties|
|Abstract:||Poly(borosilazanes) with Si/B molar ratios of 3 and 9 were synthesized, via hydroboration, from vinyl-substituted cyclotrisilazane, [CH2= CH(CH3)SiNH]3, and borane-trimethylamine adduct, (CH 3)3N:BH3. The poly(borosilazanes) were pyrolyzed up to 1000°C under nitrogen atmosphere, resulting in amorphous silicon boron carbonitride glasses (SiBCN). An almost complete retention of the B content was observed in these products. The high temperature behavior of SiBCN glasses was studied by X-ray diffraction and infrared spectroscopy. The glasses containing the larger amounts of boron remained amorphous to higher temperatures when compared with the parent B-free SiCN glass, which, at 1500°C, crystallizes in SiC. At 2000°C, the ceramic product derived from SiBCN was characterized as BN/SiC composite. © 2004 Elsevier B.V. All rights reserved.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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