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Preceramic polymer pyrolysis

Part 1 Pyrolytic properties of polysilazanes

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Abstract

The physicochemical behaviour of characterized polysilazanes has been examined during their pyrolytic transformation into amorphous silicon-based ceramics. Selected polysilazanes bearing different substituents at silicon and nitrogen were synthesized by ruthenium catalysed dehydrocoupling of Si-H bonds with N-H bonds. The relationships between the structure and chemical content of polymers and their pyrolysed ceramic compositions and yields are discussed. Possible reactions occurring during pyrolysis are described in terms of a set of mechanisms based on known behaviour of silazane monomers. The decomposition product patterns at different temperature levels and the compositions of the final ceramics suggest specific kinetically or thermodynamically controlled thermolysis pathways. Additional chemical reactivity has been observed when the amorphous ceramic products at 800° C are heated and crystallized at 1600° C.

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Author notes

  1. Kenneth B. Schwartz

    Present address: Raychem Corporation, Corporate Technology, 300 Constitution Drive, 94025-1164, Menlo Park, California, USA

  2. Richard M. Laine

    Present address: Department of Material Science and Engineering, University of Washington, 98195, Seattle, Washington, USA

Authors and Affiliations

  1. SRI International, 94025, Menlo Park, California, USA

    Yigal D. Blum, Kenneth B. Schwartz & Richard M. Laine

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Blum, Y.D., Schwartz, K.B. & Laine, R.M. Preceramic polymer pyrolysis. J Mater Sci 24, 1707–1718 (1989). https://doi.org/10.1007/BF01105695

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