GH864表面爆炸喷涂Cr3C2-NiCr涂层的显微组织和高温摩擦性能研究  

Study on Microstructure and High Temperature Friction Properties of CrC-NiCr Coating on GH864 Surface by Explosive Spraying

作　　者：刘文朝 牛显明[1] 李佐政 曹洋 LIU Wenzhao;NIU Xianming;LI Zuozheng;CAO Yang(College of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学材料科学与工程学院,甘肃兰州730050

出　　处：《热加工工艺》2020年第18期100-103,共4页Hot Working Technology

摘　　要：采用爆炸喷涂技术在GH864基体上制备了Cr3C2-Ni Cr/Ni Cr Al复合金属陶瓷涂层。运用HT-1000高温摩擦磨损实验机,以Si3N4陶瓷球为摩擦副对基体和涂层进行高温摩擦磨损实验。选用扫描电镜、能谱仪、X衍射等分析手段,研究了在GH864表面爆炸喷涂涂层的组织形貌、相组成及涂层和基体的高温摩擦行为。对800℃时涂层和基体摩擦性能进行研究。结果表明:该涂层组织致密呈叠层堆砌,其显微组织为Cr3C2硬质相及周围缝隙中充填的Ni Crγ相和少量的Cr3C2分解形成的Cr7C3相。涂层在高温下的磨损形式主要为磨粒磨损、疲劳磨损以及粘着磨损和氧化磨损,涂层中大量分布的具有热稳定性的Cr3C2硬质颗粒起主要的耐磨作用,复合涂层可提高GH864的高温耐磨性。Cr3C2-Ni Cr/Ni Cr Al composite cermet coatings were prepared on GH864 substrate by explosive spraying technique. Using HT-1000 high temperature friction and wear tester, Si3N4 ceramic ball was used as friction pair to carry out high temperature friction and wear test for the substrate and coating. The microstructure, phase composition and high temperature friction behavior of the coating and matrix were investigated by scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. The friction properties of the coating and matrix at 800 ℃ were investigated. The results show that the microstructure of the coating is densely stacked, and its microstructure is Cr3C2 hard phase and Ni Cr γ phase filled in the surrounding gap and a small amount of Cr7C3 phase formed by the decomposition of Cr3C2. The wear form of the coating at high temperature is mainly abrasive wear, fatigue wear, adhesive wear and oxidative wear. The heat-stabilized Cr3C2 hard particles distributed in the coating play a major role in wear resistance, and the composite coating can improve the high temperature wear resistance of GH864.

关 键 词：爆炸喷涂 Cr3C2-NiCr/NiCrAl 高温摩擦磨损 

分 类 号：TG174.44[金属学及工艺—金属表面处理]