Preparation of Non-Oxide Ceramics by Pyrolysis of Organometallic Precursors

摘要

Molecular precursors to non-oxide ceramics are finding increasing interest forapplications where conventional processing methods fail to provide the ceramic product in the required purity, microstructure and/or final form. The thermoplasticity, volatility, solubility, and/or molecular-level homogeneity of such precursor systems can provide, for example: high surface area powders of pure phases or of homogeneous nanocomposites; thin films and coatings by CVD and by pyrolysis of solution-applied precursor films; and continuous ceramic fiber < 10 micro in diameter. Selected examples from our research on precursors to AlN, Si3N4 and SiC, including the synthesis of new precursors and solid state NMR studies of the precursor-to ceramic conversion process, will be used to illustrate the potential advantages of this approach to non-oxide ceramics. ceramic films, coatings, CVD, SiC, AlN, Si3N4, molecular precursors