氮化硅改性聚酰亚胺复合涂层的耐热蚀性能研究  

Study on Heat-Corrosion Resistance of Silicon Nitride Modified Polyimide Composite Coatings SI

作　　者：司诚毅 樊小强 朱旻昊[1,2] Cheng-yi;FAN Xiao-qiang;ZHU Min-hao(Key Laboratory of Advanced Technologies of Materials(Ministry of Education),School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031,China;Tribology Research Institute,School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学先进材料教育部重点实验室,四川成都610031 [2]西南交通大学机械工程学院摩擦学研究所,四川成都610031

出　　处：《材料保护》2023年第5期76-82,共7页Materials Protection

基　　金：国家自然科学基金(52075458和U2141211)资助。

摘　　要：为满足高温条件下高分子复合涂层的应用需求,推进高分子有机复合涂层在高温防护领域的实际应用,选择聚酰亚胺(PI)为树脂基体,通过加入纳米Si_(3)N_(4)改性增强其耐热性,研究硅烷偶联剂KH550与不同含量的Si_(3)N_(4)对涂层表面状态以及耐热性能的影响。实验结果表明:加入10%(质量分数)Si_(3)N_(4)的改性复合涂层的玻璃化转变温度(T_(g))达到495℃,高于纯PI涂层的T_(g)(483℃)。加入KH550后,一方面KH550在Si_(3)N_(4)表面引入氨基官能团使其与PI分子链交联,另一方面KH550直接与PI分子相互作用提升涂料的黏度,使Si_(3)N_(4)分散性及涂层与基体的结合力均有显著提升。此外,分别制备不同含量Si_(3)N_(4)的PI复合涂层并进行比较,发现10%Si_(3)N_(4)的PI复合涂层的耐热性以及表面质量最优。In order to meet the application requirements of polymer composite coating under high temperature conditions and promote the practical application of polymer organic composite coating in the field of high temperature protection,polyimide(PI)was selected as the resin matrix,and the heat resistance was modified and enhanced by adding nano-Si_(3)N_(4).Moreover,the effects of silane coupling agent KH550 and different content of Si3 N4 on the surface state and heat resistance of the coating were studied.Results showed that the glass transition temperature(T_(g))of the composite coating with 10%(mass fraction)Si_(3)N_(4)increased to 495℃,which was higher than that of pure PI coating(483℃).After the addition of KH550,on one hand,KH550 introduced amino functional groups on the Si_(3)N_(4)surface to cross-link it with the PI molecular chain;on the other hand,KH550 directly interacted with PI molecules to enhance the viscosity of the coating,so that the disper-sion of Si_(3)N_(4)and the binding force of the coating and the substrate were significantly improved.Besides,the PI composite coatings with differ-ent contents of Si_(3)N_(4)were prepared for comparison,and it could be found that the PI composite coating with 10%Si_(3)N_(4)exhibited the optimal heat resistance and surface quality.

关 键 词：聚酰亚胺 SI3N4 复合涂层 抗热蚀性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]