ポリオルガノボロシラザンの合成と超耐熱ボロシリコンカーボナイトライドへの転換(<ゲストエディターによる特集>有機-無機変換プロセス)

概要

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Polyorganoborosilazanes with a wide range of B/Si/C ratios were synthesized by co-ammonolysis of various organochlorosilanes and borontrichloride. By pyrolysis of SiMe_2Cl_2-based or SiHC_2H_5Cl_2-based polyorganoborosilazane with limited B/Si/C ratios in an inert atmosphere, amorphous borosilicon carbonitrides stable at 1880℃ were prepared. The amorphous structure of borosilicon carbonitride was closely related to distributions of B-N bonds, substituent groups on Si atoms and contents of B and C atoms in the preceramic polymers. Three-dimensional BCN networks in the ceramics maintained amorphous structures up to higher temperatures. These prepared ceramics were not only thermally stable, but the oxidation resistance is also excellent at 1700℃ in dry air and at 1500℃ under reduced pressures.
2006-06-01