烧结温度对C/C-ZrC-SiC复合材料性能的影响  

Effect of sintering temperature on mechanical performance and ablation resistance of C/C-ZrC-SiC composites

作　　者：刘雪 欧阳海波[1] 李翠艳[1] 黎桂标 董继杰 黄剑锋[1] LIU Xue;OU Yanghaibo;LI Cuiyan;LI Guibiao;DONG Jijie;HUANG Jianfeng(School of Materials Science and Engineering,Shaanxi University of Science&Technology,Xi’an 710021,China)

机构地区：[1]陕西科技大学材料科学与工程学院,西安710021

出　　处：《固体火箭技术》2020年第3期326-332,共7页Journal of Solid Rocket Technology

基　　金：国家自然科学基金(51402177);陕西省科技新星项目(2016KJXX-07);咸阳市科学技术研究计划项目(2018k02-15)。

摘　　要：以葡萄糖作为碳源,硅溶胶作为硅源,氧氯化锆作为锆源,采用水热共沉积-碳热还原法制备了C/C-ZrC-SiC复合材料,研究了材料的烧结温度对C/C-ZrC-SiC复合材料的微观形貌、力学性能和耐烧蚀性能的影响。结果表明,烧结温度对水热共沉积制备C/C-ZrC-SiC复合材料的性能影响显著。水热共沉积制备的C/C-ZrO2-SiO2陶瓷在1600℃下烧结,可获得C/C-ZrC-SiC复合材料,ZrC和SiC陶瓷相颗粒粒径约为500 nm,在基体中均匀分布。1600℃烧结的C/C-ZrC-SiC复合材料表现出最佳的力学性能和抗烧蚀性能,其最大弯曲强度为173.8 MPa,质量烧蚀率和线烧蚀率分别为1.28×10-4g/(cm2·s)和1.67μm/s。过高的烧结温度导致晶粒粗大、孔隙缺陷增多,使得复合材料力学性能恶化、抗烧蚀性能大幅降低。Taking Glucose as the carbon source,silica sol as the silica source as well as zirconium oxychloride as the zirconiumsource,the C/C-ZrC-SiC composites were prepared by hydrothermal co-deposition and carbothermal reduction.The effects of sinte-ring temperature on micromorphology,mechanical properties and ablation resistance of C/C-ZrC-SiC composites were investigated.The results show that the sintering temperature has a significant effect on the properties of C/C-ZrC-SiC composites prepared by hy-drothermal co-deposition.The C/C-ZrO2-SiO2 ceramics obtained by hydrothermal co-deposition can be carbon-thermally reduced toobtain C/C-ZrC-SiC composites at 1600℃.Particle size of the ceramic phase particles of ZrC and SiC is about 500 nm,and thoseparticles are evenly distributed in the matrix.The mechanical properties and ablation resistance of C/C-ZrC-SiC composites at1600℃are up to the best,the maximum bending strength of C/C-ZrC-SiC composites is 173.8 MPa,and the line ablation rate is 1.67μm/s,and the mass ablation rate is 1.28×10-4g/(cm2·s).Too high sintering temperatures can lead to coarse grains,changein pore structure,and deteriorate mechanical properties and ablation resistance.

关 键 词：C/C-ZrC-SiC复合材料 烧结温度 微观结构 力学性能 抗烧蚀性能 

分 类 号：V435[航空宇航科学与技术—航空宇航推进理论与工程]