Polymeric liquid precursor of multi-component ZrC-SiC ceramic

Polymeric liquid ceramic precursors for the production of multi-component ZrC-SiC ceramics were prepared by reactive blending of polyzirconoxanesal, phenylacetylene-terminated polysilane and bisphenol - A type benzoxazine. The polymeric liquid precursors of ZrC-SiC ceramic have the processing capability of Precursor-Infiltration-and-Pyrolysis technique in ceramic composites fabrication. The thermal cure reactions included by the catalytic polymerisation of ethynyl groups, the ring opening polymerisation of benzoxazine rings, and the condensation of zirconate with phenolic hydroxyl and Si-H at 200-350°C. The monolithic ceramics were formed upon pyrolysis at 1000, 1200 and 1600°C in a yield of 65, 62 and 40%, respectively. X-ray diffraction and SEM-EDS results revealed that almost pure, elemental, uniformly distributed ZrC-SiC multi-component ceramic monolith was obtained through pyrolysis at 1600°C via carbothermal reduction of ZrO₂.