等离子喷涂TiB_(2)-SiC复合涂层及其热稳定性研究  

The plasma sprayed TiB_(2)-SiC composite coating and its thermal stability

作　　者：秦艳芳 张馨 刘校龙 卢金斌 何继宁[2] QIN Yanfang;ZHANG Xin;LIU Xiaolong;LU Jinbin;HE Jining(School of Mechanical Engineering,SUST,Suzhou 215009,China;School of Materials Science and Engineering,Hebei University of Technology,Tianjin 300132,China)

机构地区：[1]苏州科技大学机械工程学院,江苏苏州215009 [2]河北工业大学材料科学与工程学院,天津300132

出　　处：《苏州科技大学学报（自然科学版）》2021年第2期31-37,共7页Journal of Suzhou University of Science and Technology（Natural Science Edition）

基　　金：苏州科技大学校级青年项目(342031401);苏州科技大学科研启动经费项目(332011401)。

摘　　要：利用喷雾干燥重构微米级TiB_(2)-SiC喷涂团聚粉,借助等离子喷涂成功制备了TiB_(2)-SiC复合涂层。结果表明,包覆结构可减缓SiC高温分解,获得TiB_(2)、SiC主相共存的复合涂层。通过显微硬度测定及Weibull分布发现,当SiC质量分数为5%时,复合涂层的平均显微硬度为1088.8 Hv_(0.2),分散性系数β为9.2,均高于含20 wt%SiC制备的涂层,表明其具有更稳定的性能和结构。通过900℃和1000℃高温热冲击性及抗氧化性能测定发现,TiB_(2)-5 wt%SiC制备的复合涂层具有更为优异的抗热冲击性能和抗高温氧化性能。In this paper,micron scale TiB_(2)-SiC agglomerate powders were reconstructed by spray drying,and the TiB_(2)-SiC composite coatings were successfully prepared by plasma spraying.The results show that the cladding structure of TiB_(2)-SiC agglomerates can slow down the high decomposition of SiC.Accordingly,the as-sprayed composite coatings are TiB_(2) and SiC main phases co-existence.Based on the microhardness measurement and Weibull distribution of composite coatings,it is found that when the mass fraction of SiC is 5 wt%SiC,the average microhardness of composite coating is 1088.8 Hv_(0.2) and the dispersion coefficientβis 9.2.Both of them are higher than the coating containing 20 wt%SiC,which indicates that it has more stable properties and structure.The composite coating prepared by TiB_(2)-5 wt%SiC has better thermal shock resistance and high temperature oxidation resistance through the determination of thermal shock resistance at 900℃and 1000℃.

关 键 词：等离子喷涂 TiB_(2)-SiC 高温涂层 WEIBULL分布 热稳定性 

分 类 号：TB383[一般工业技术—材料科学与工程] TB33