Application of zirconium in preparation of polycarbosilane derived ceramics

来源期刊：中国有色金属学报(英文版)2000年第6期

论文作者：谢征芳 陈朝辉 李永清 郑文伟 胡海峰 肖加余

文章页码：783 - 787

Key words：active filler; zirconium (Zr); polycarbosilane (PCS); ceramics

Abstract: The metallic zirconium (Zr) powder as active filler was applied in polycarbosilane (PCS) preceramic precursor derived ceramics. It was found that the addition of Zr decreases the porosity of the green compact and, since Zr can react with N2to produce nitride, the ceramic productivity is increased. The ceramic productivity will be 100% when the volume fraction of Zr/PCS is 44%. Zr also enhances the three-point bending strength of the ceramic with the strength of 104MPa when the volume fraction of Zr/PCS is 60%. However, the addition of Zr in PCS can not restrain the linear shrinkage upon pyrolysis, the linear shrinkage increases with increasing the volume fraction of Zr/PCS. Phase composition was analyzed using X-ray diffraction (XRD). Fracture surfaces of the specimens after three-point bending tests were examined on the scanning electron microscope