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以聚硅碳硅烷(PSCS)与乙酰丙酮锆为原料合成聚锆碳硅烷(PZCS),采用先驱体转化法制备了Si-Zr-C-O纤维.通过元素分析、扫描电镜(SEM)、X射线衍射(XRD)和俄歇电子能谱(AES)等分析测试手段研究了Si-Zr-C-O纤维的组成结构及其耐高温抗氧化性能.结果表明:Si-Zr-C-O纤维的元素组成为SiC1.24HxO0.56Zr0.0129,平均强度2.5GPa,平均直径11μm,纤维表面光滑平坦,没出现孔洞、裂纹、沟槽等缺陷,直径均匀.该纤维耐超高温性能良好,在1450和1600℃处理后,强度保留率分别为72%和36%,1800℃处理后Si-Zr-C-O纤维的化学式为SiC0.99HxO0.1Zry,纤维氧含量大大降低;纤维抗氧化性能良好,空气中1000℃热处理20h后,强度保留率为71.2%,热处理100h后,强度保留率为50%.
Si-Zr-CO fibers were prepared by precursor conversion method using polycarbosilane (PSCS) and zirconium acetylacetonate as raw materials. The structure and properties of Si-Zr-CO fibers were characterized by elemental analysis, scanning electron microscopy The structure of Si-Zr-CO fiber and its high temperature oxidation resistance were studied by X-ray diffraction (XRD) and Auger electron spectroscopy (AES). The results show that the elemental composition of Si-Zr-CO fiber is SiC1. 24HxO0.56Zr0.0129, with an average strength of 2.5GPa and an average diameter of 11μm, the fiber surface is smooth and flat, no defects such as holes, cracks and grooves are formed and the diameter is uniform.The fiber has excellent performance at ultra-high temperature and after treated at 1450 and 1600 ℃, The strength retention rate was 72% and 36% respectively. The chemical formula of Si-Zr-CO fiber was SiC0.99HxO0.1Zry after 1800 ℃ treatment, the fiber oxygen content decreased greatly. The fiber had good oxidation resistance. After heat treatment in air at 1000 ℃ for 20h, Strength retention rate of 71.2%, 100h after heat treatment, the strength retention rate of 50%.