SiBN3C Ceramic workpieces by pressureless pyrolysis without sintering aids: preparation, characterization and electrical properties

Abstract

For the first time, additive-free solids of the polymer-derived amorphous ceramic SiBN₃C have been achieved. Green bodies made by cold pressing of partially cross-linked N-methylpolyborsilazane powders have shrunk isotropically, and thus have retained their shape after calcination at 1400 °C. The chemical, physical and thermal properties of the bodies are virtually the same as of conventionally synthesized SiBN₃C powders or of SiBN₃C fibers. With respect to their electrical properties SiBN₃C bodies can be classified as good semiconductors.