摘要
以Ni和Si元素粉末为原料,利用10kW CO2连续激光器在GH864表面激光熔覆制得了Ni-Si金属硅化物涂层,并分别加入Nb,Ti等合金元素,对涂层性能进行改善。用扫描电镜、能谱仪、X射线衍射和显微硬度计等手段分析涂覆层的微观组织、相组成和显微硬度,并对涂层在1mol/L的H2SO4溶液中的耐蚀性能进行评价。结果表明,涂层和基体呈良好的冶金结合,涂层宏观质量完好,无裂纹、气孔等缺陷。合金元素Nb的添加可以提高涂层的硬度,Ti使涂层硬度有所下降,但涂层整体硬度比基体高2～3倍。添加合金元素后的涂层均具有良好的耐蚀性。
The in-situ synthesis of NbC/Ni3Si composite coating on the nickel-matrix superalloy substrate is prepared by 10kW CO2 continuous cladding laser with Si and Ni powders as raw material. And the performance of the coating is improved by addition of the Nb and Ti as additives. The microstructures, phrase composition and microhardness of the cladding zone are analyzed by using SEM, EDS, XRD and microhardness tester, and the properties of corrosion resistance of the cladding layers are tested in 1 mol/L H2SO4 solution. The experimental results show that an excellent bonding between the coating and the substrate is ensured by the strong metallurgical interface. The quality of coating is very well and free from cracks and pores. The hardness of the cladding is improved by Nb addition, and decreased by Ti addition, but the whole hardness is 2-3 times more than that the substrate. The cladding layers with the alloy elements possess good corrosion resistance.
出处
《有色金属》
CAS
CSCD
北大核心
2008年第4期40-43,共4页
Nonferrous Metals
基金
甘肃省科技攻关项目(2GS057-A52-001-03)
