真空扩散原位合成NiCoCrAlY涂层及其抗氧化性能  

NiCoCrAlY Coating of In-Situ Synthesis by Vacuum Diffusion and Its Oxidation Resistance

作　　者：杨效田[1,2] 付小月 冯力 安国升[1] 李文生[1] Yang Xiaotian;Fu Xiaoyue;Feng Li;An Guosheng;Li Wensheng(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;Wenzhou Engineering Institute of Pump&Valve,Lanzhou University of Technology,Wenzhou 325105,China)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050 [2]兰州理工大学温州泵阀工程研究院,浙江温州325105

出　　处：《稀有金属材料与工程》2020年第5期1750-1756,共7页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51674130);国家重点研发计划国际科技合作项目(2016YFE0111400);浙江省自然科学基金(LGG19E010003);中国博士后科研基金(2018-63-200618-34)。

摘　　要：采用机械混合的方法将Ni,Co,Cr,Al,Y的单质粉末按照4:2:1.5:1:0.03的比例机械混合4 h后,利用低压冷喷涂设备(GDU-3-15)在310S不锈钢基体表面沉积厚度为160μm的混合粉体涂层,将制备好的样品置于真空管式炉(TL1700)中进行热扩散原位合成合金涂层。采用扫描电子显微镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)、显微硬度计等方法对喷涂态及扩散合成的NiCoCrAlY合金涂层的显微组织、物相组成、显微硬度等进行对比研究。结果表明:冷喷涂制备的NiCoCrAlY混合粉体涂层主要以单质元素混合存在,经过1100℃,4 h真空扩散后,涂层中发生了元素的扩散和冶金反应,涂层与基体间有扩散现象发生,形成明显的冶金结合;氧化实验表明,原位扩散合成的NiCoCrAlY涂层的试样氧化增重明显低于纯基体试样,能对基体起到很好的保护作用,有效地保护了基体不被快速氧化。The mixture of Ni, Co, Cr, Al, Y powders were prepared by mechanical mixing for 4 h with the ratio of 4:2:1.5:1:0.03 of Ni, Co, Cr, Al, and Y, and the deposited mixed powder coating with a thickness of 160 μm was prepared on the 310 S stainless steel substrate by using the low-pressure cold spray equipment(GDU-3-15). The sample was placed into a vacuum tube furnace(TL1700) for thermal diffusion treatment. The microstructure, phase composition and microhardness of in-situ synthesis NiCoCrAlY alloy coatings were analyzed by scanning electron microscopy(SEM), energy dispersive spectroscopy(EDS), X-ray diffractometry(XRD) and microhardness tester, etc. The results show that the mixed powder coating of Ni, Co, Cr, Al, Y prepared by the cold spraying is mainly composed of simple elements. However, the diffusion reaction of the elements occurs in the coating after vacuum diffusion at 1100℃ for 4 h. In the meantime, there is a diffusion phenomenon between the coating and the substrate, which forms an obvious metallurgical bond. Oxidation experiments show that the NiCoCrAlY coating of in-situ synthesis exhibits significantly lower oxidation mass gain than the pure substrate, which can protects the substrate from rapid oxidation effectively.

关 键 词：冷喷涂 NiCoCrAlY合金涂层 微观组织形貌 元素扩散 界面 

分 类 号：TG174.44[金属学及工艺—金属表面处理]