Phase properties, polycrystalline boron

Many modifications to the existing Yajima polycarbosilanes (PCS) precursors have been reported in efforts to improve ceramic yields, phase purity and the mechanical properties . Only a few of these actually provide phase pure SiC through processing efforts alone. For example, Dow Corning work reports that thermally stable, substantially dense polycrystalline SiC fibers (>2.9 gmD vs 3.2 gmD theoretical) can be processed from polydimethylsilane-derived PCS by adding boron during the processing step. ... 

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