The pyrolytic conversion of perhydropolysilazane into silicon nitride

Abstract Polymeric precursors to ceramics have the potential to enable production of ceramic articles in novel forms, with novel microstructures, and improved properties. The polymer-to-ceramic conversion process is not sufficiently understood for this approach to be widely utilised. Perhydropolysilazane converts to high purity silicon nitride (Si 3 N 4 ), and has been shown to be a useful coating and matrix precursor. The conversion of PHPS to Si 3 N 4 is being examined by Solid State, Magic Angle Spinning (MAS) NMR spectroscopy and other techniques. This paper summarises the results to date of this investigation.