反应等离子喷涂TiC-SiC复合涂层及其热稳定性  

Reactive plasma sprayed TiC-SiC composite coatings and its thermal stability

作　　者：潘浩宇 穆佳雨 穆林杰 丁一鸣 邱彦 秦艳芳 宋劲松 PAN Haoyu;MU Jiayu;MU Linjie;DING Yiming;QIU Yan;QIN Yanfang;SONG Jinsong(School of Mechanical Engineering,Suzhou University of Science and Technology,Suzhou 215009,China;Hebei Petroleum University of Technology Industrial Technology Center,Chengde 067000,China)

机构地区：[1]苏州科技大学机械工程学院,江苏苏州215009 [2]河北石油职业技术大学工业技术中心,河北承德067000

出　　处：《材料科学与工艺》2024年第4期48-56,共9页Materials Science and Technology

基　　金：江苏省大学生创新创业项目(202210332014Y);江苏省高等学校自然科学研究面上项目(422111401)。

摘　　要：具有强共价键结合的碳化物和硅化物是高温防护涂层重要的候选材料,但单相材料通常难以达到良好的综合性能。为提高单相TiC陶瓷的高温性能,本文以Ti、石墨粉及SiC为原料,采用反应等离子喷涂制备了TiC-SiC复合涂层,利用XRD和SEM对涂层物相组成、结构及形貌进行了研究,并对比分析了涂层的显微硬度及其Weibull分布特点。研究表明:Ti粉与石墨粉间发生反应合成TiC,沉积涂层以TiC、SiC为主相;Ti-C-5wt.%SiC制备涂层的平均显微硬度(1070.8HV0.2)略低于Ti-C-20wt.%SiC制备的涂层(1127HV0.2),但其硬度分散性系数β和相关系数R均高于Ti-C-20wt.%SiC复合粉制备的涂层,这源于Ti-C-5wt.%SiC制备涂层相对均匀的显微结构。另外,900~1100℃热冲击性能及1000℃氧化性能的测试结果表明,Ti-C-5wt.%SiC制备的涂层具有更为优异的抗热冲击性和抗氧化性,这是由于该涂层具有较高的致密性,极大延缓了氧气进入涂层的时间。Carbides and silicides with strong covalent bonds are important candidate materials for high temperature protective coatings,but it is difficult for single⁃phase material to achieve good comprehensive properties.In order to improve the high temperature performance of single TiC ceramics,TiC-SiC composite coatings were prepared by reactive plasma spraying technology with raw materials of Ti,SiC and graphite powders.This study features an examination of the phase composition,microstructure and morphology of coatings by SEM and XRD,as well as a comparative analysis of the micro⁃hardness and the Weibull distribution.The results show that the Ti powder reacts with graphite powder then forms TiC and the as⁃sprayed coatings main phases are consisted of TiC and SiC.According to the micro⁃hardness and the Weibull distribution curves of composite coatings,the average micro⁃hardness(1070.8HV0.2)of the coating sprayed with Ti-C-5wt.%SiC powders is slightly lower than that of the coating(1127HV0.2)prepared with Ti-C-20wt.%SiC powders.However,the dispersion coefficientβand correlation coefficient R of the coating sprayed with Ti-C-5wt.%SiC powders are higher than that of the coating fabricated by Ti-C-20wt.%SiC powders and this can be explained by relatively uniform microstructure of the coating fabricated by Ti-C-5wt.%SiC powders.Besides,based on the test results of 900~1100℃thermal impact and 1000℃oxidation resistance of coatings,the coating fabricated with Ti-C-5wt.%SiC powders presents better heat impact resistance and oxidation resistance due to its relatively high compactness which can reduce the opportunities and efficiencies of exposure to the oxygen at high temperature.

关 键 词：反应等离子喷涂 TiC-SiC 复合涂层 WEIBULL分布 热稳定性 

分 类 号：TB383[一般工业技术—材料科学与工程]