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在GH4169表面通过激光熔覆制备不同成分配比的Mo Si2-Ni Cr Si B复合涂层,利用扫描电镜对熔覆层的微观组织进行观察,测试了熔覆层的显微硬度及高温抗氧化性能。结果表明:添加不同比例的镍基合粉末制备的Mo Si2-Ni Cr Si B复合涂层试样与基体形成良好的冶金结合,无明显的裂纹、空洞,且随镍基合金粉末的添加,熔覆层组织与基体的结合越来越紧密,树枝晶状的硅钼相与合金相交错分布。添加不同比例镍基合金粉末时复合涂层的显微硬度比基体都有所提高,最高可达540 HV0.2,是基体硬度的1.2倍,随镍基合金粉末的增多,复合涂层硬度降低,最多会降低11%。添加10%的镍基合金粉末时试样的高温抗氧化性能最好。
On the surface of GH4169, the Mo Si2-Ni Cr Si B composite coating with different compositions was prepared by laser cladding. The microstructure of cladding layer was observed by scanning electron microscopy. The microhardness and high temperature oxidation resistance performance. The results show that the MoSi2-Ni Cr Si B composite coating prepared by adding different proportions of nickel-based powder has a good metallurgical bond with the matrix without obvious cracks and voids. With the addition of nickel-based alloy powder, the melting Cladding organizations and the substrate more and more close, dendritic silicon molybdenum phase and alloy staggered distribution. The microhardness of the composite coating increases with the addition of different proportions of nickel-based alloy powder, up to 540 HV0.2, which is 1.2 times that of the matrix. With the increase of nickel-based alloy powder, the hardness of the composite coating decreases , Will be reduced by up to 11%. When adding 10% Ni-based alloy powder, the samples have the best high-temperature oxidation resistance.