TaC对SiC涂层高温耐烧蚀性能的影响  

Effect of TaC on high temperature ablative resistance of SiC coatings

作　　者：罗骁 陈晔松 康盼 方家 杨鑫[1] 黄启忠[1] LUO Xiao;CHEN Yesong;KANG Pan;FANG Jia;YANG Xin;HUANG Qizhong(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 430081,China)

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙430081

出　　处：《粉末冶金材料科学与工程》2023年第2期120-128,共9页Materials Science and Engineering of Powder Metallurgy

基　　金：湖南省自然科学基金面上项目(2021JJ30852)。

摘　　要：以Si粉和Ta2O5粉为原料,采用包埋反应工艺在C/C复合材料表面制备SiC涂层和SiC-TaC复合涂层,通过X射线衍射、扫描电镜和高温等离子火焰(2300℃左右)烧蚀实验,研究TaC对SiC涂层微观结构、高温耐烧蚀性能的影响和影响机理。结果表明:TaC可有效提升SiC涂层的高温耐烧蚀性能。经30 s等离子火焰烧蚀后,SiC涂层的质量烧蚀率和线烧蚀率分别为(0.1892±0.0800)mg/s和(1.3867±0.1200)μm/s,而SiC-TaC复合涂层的质量烧蚀率和线烧蚀率分别为(0.0627±0.0500)mg/s和(0.8939±0.0700)μm/s,比SiC涂层的质量烧蚀率和线烧蚀率分别降低66.86%和35.54%。SiC-TaC复合涂层的高温耐烧蚀性能提高主要与涂层的高温稳定性增强及烧蚀过程中熔融Ta2O5相的自愈合作用有关。SiC coating and SiC-TaC composite coating were prepared on the surface of C/C composites by embedding reaction process using Si and Ta2O5 powders as raw materials.The effects of TaC on the microstructure and high temperature ablation resistance of SiC coating were studied by X-ray diffraction,scanning electron microscopy and high temperature plasma flame(about 2300℃)ablation experiments.The results show that addition of TaC can effectively improve the ablation resistance of SiC coating.After ablation under plasma flame for 30 s,the mass and linear ablation rates of SiC coating are(0.1892±0.0800)mg/s and(1.3867±0.1200)μm/s,respectively.With addition of TaC phase,the mass and linear ablation rates of SiC-TaC coating are(0.0627±0.0500)mg/s and(0.8939±0.0700)μm/s,respectively,the mass and linear ablation rates of SiC-TaC coating are decreased by 66.86%and 35.54%,respectively.The improvement of high-temperature ablation resistance of SiC-TaC composite coating is mainly related to the enhancement of high-temperature stability of the coating and the self-healing cooperation of molten Ta2O5 phase during ablation.

关 键 词：包埋法 SIC涂层 SiC-TaC涂层 耐烧蚀性能 C/C复合材料 

分 类 号：TB332[一般工业技术—材料科学与工程]