SiC/ZrB2-SiC-B4C涂层的抗氧化和耐烧蚀性能  

Oxidation and Ablation Resistance of SiC/ZrB2-SiC-B4C Coatings for C/SiC Composites

作　　者：张宝鹏 于新民[1] 刘俊鹏[1] 刘伟 霍鹏飞[1] Zhang Baopeng;Yu Xinmin;Liu Junpeng;Liu Wei;Huo Pengfei(Aerospace Institute of Advanced Materials&Processing Technology,Beijing 100074,China)

机构地区：[1]航天特种材料及工艺技术研究所,北京100074

出　　处：《稀有金属材料与工程》2020年第12期4072-4080,共9页Rare Metal Materials and Engineering

摘　　要：采用化学气相沉积(CVD)和浆料刷涂-烧结法制备了双层SiC/ZrB2-SiC-B4C涂层,对比研究了无涂层、单层Si C涂层和双层SiC/ZrB2-SiC-B4C涂层C/SiC复合材料在1500℃下的氧化和在4.2 MW/m2热流密度下的烧蚀性能。结果表明:制备态ZrB2-SiC-B4C涂层致密、完整,表面平均粗糙度约为1μm,孔隙率约为4.2%。在1500℃氧化30 h后,SiC/ZrB2-SiC-B4C涂层C/SiC复合材料的质量损失率约为10%,涂层表面氧化膜致密,无明显裂纹。高温烧蚀20 s后,SiC/ZrB2-SiC-B4C涂层的线烧蚀率和质量烧蚀率分别为1.0±0.3μm/s和1.1±0.2 mg/s,与单层Si C涂层相比分别降低了75.0%和50.0%,SiC/ZrB2-SiC-B4C涂层烧蚀后形成的ZrO2-SiO2氧化膜可以减缓火焰对复合材料的机械剥蚀。Double-layered SiC/ZrB2-SiC-B4C coatings were fabricated by chemical vapor deposition(CVD)and slurry painting-sintering methods.The naked,single-Si C coated and SiC/ZrB2-SiC-B4C double-layered C/SiC composites were oxidized at 1500℃and ablated under a heat flux of 4.2 MW/m2.The results indicate that the slurry-painted ZrB2-SiC-B4C coating is dense and intact,which has a surface roughness Ra of^1μm and the porosity of^4.2%.After oxidation at 1500℃for 30 h,the mass loss ratio of SiC/ZrB2-SiC-B4C coated C/SiC composite is^10%.The oxidation scale on the coating surface is compact without obvious cracking.After ablating for 20 s,the linear and mass ablation rates of SiC/ZrB2-SiC-B4C coating are 1.0±0.3μm/s and 1.1±0.2 mg/s,decreased by 75.0%and 50.0%relative to those of the Si C coating,respectively.The formed ZrO2-SiO2 scale provides a protection against the mechanical erosion from the flame.

关 键 词：C/SIC复合材料 涂层 浆料刷涂 氧化 烧蚀 

分 类 号：TB306[一般工业技术—材料科学与工程]