摘要
以Mo、Ni、Si粉末为原料，利用氩弧熔覆技术，在廉价的Q235钢材表面原位合成了MoNiSi／Ni3Si金属硅化物复合涂层。应用扫描电镜、X射线衍射仪、显微硬度计对复合涂层的组织和性能进行了观察和分析。结果表明：熔覆层与基体呈冶金结合，且整个涂层组织均匀，无气孔和裂纹等缺陷；涂层由初生相MoNiSi、共晶相MoNiSi／Ni3Si和α-Fe组成；涂层的显微硬度可迭1050-1100 HV。
MoNiSi/Ni3Si metal silicide composite coating which was fabricated on the cheap substrate of Q235 steel by gas tungsten arc welding （GTAW） using Mo-Ni-Si elemental powder blends that was used for in-situ synthesis. The microstructure and properties of coating were investigated by scanning electron microscope, X-Ray dlffractometer and microhardness tester. The results show that the interface between the coating and the substrate is jointed by the strong metallurgical bonding, and the microstructure of coating is uniform without pores and cracks, which is consisted of the primary MoNiSi and eutectic MoNiSi/Ni3Si and α-Fe matrix. The microhardness can reach 1 050---1 100 HV.
出处
《铸造技术》
CAS
北大核心
2008年第8期1099-1102,共4页
Foundry Technology
关键词
金属基复合材料
氩弧熔覆
原位生成
显微组织
Metal matrix composites
Gas tungsten arc welding
In-situ reaction
Microstructure
