摘要
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-C-O fibers were obtained from polyzirconocarbosilane（PZCS）, which was synthesized by the reaction of polysilacarbosilane（PSCS） and Zr（AcAc）4.The high-temperature resistance and oxidation resistance performance of Si-Zr-C-O fibers were examined by measurements of X-ray diffraction（XRD）, scanning electron microscope（SEM）, auger electron spectroscopy（AES） and element analysis.The surface of Si-Zr-C-O fibers is smooth, and do not exhibit obvious disfigurements.The average diameter of the fibers is 11 μm, the average tensile strength is 2.5 GPa.Si-Zr-C-O fibers have good high-temperature-resistant performance.Processing at 1450 and 1600 ℃, the tensile strength retention rate is 72% and 36% respectively.The chemical formula of Si-Zr-C-O fibers is SiC0.99HxO0.1Zry after processing at 1800 ℃, the oxygen content of the fibers decreases obviously.Si-Zr-C-O fibers also have good oxidation-resistance properties.After processing for 20 h at 1000 ℃ in the air, the tensile strength retention rate is 71.2%, after processing for 100 h, the tensile strength retention rate is 50%.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2010年第5期418-424,共7页
Acta Chimica Sinica
基金
国防科技大学预研项目(No.JC-06-01-05)
国防科技大学CFC重点实验室基金(No.9140C8201020901)
国防基础科研项目(No.A2820060068)资助项目
