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用CrFe、FeAl、Ti和304不锈钢粉末为涂层原材料,在哈氏合金表面利用火焰喷涂和激光原位合成技术制备了Cr-Fe-Al-Ti-C复合涂层。借助光学显微镜、X射线衍射仪、扫描电镜和显微硬度仪等分别对复合涂层表面宏观形貌、微观组织结构以及显微硬度进行了分析。结果表明,复合粉末CrFe、FeAl和Ti质量比为2∶2∶1时,涂层表面较光整,无气孔、裂纹和过熔等缺陷。激光原位合成含有Cr2O3、Al2O3、Cr7C3、SiC等硬质陶瓷相的3种复合涂层组织弥散均匀分布,无凹坑和裂纹等缺陷,复合涂层与基材形成了良好的冶金结合。3种复合涂层的显微硬度值较基材均有显著提高,最高达974.9HV0.2,约为基材硬度的4倍。
Cr-Fe-Al-Ti-C composite coatings were prepared on the surface of Hastelloy by flame spraying and laser in-situ synthesis using CrFe, FeAl, Ti and 304 stainless steel powders as coating raw materials. The surface morphology, microstructure and microhardness of the composite coatings were analyzed by optical microscope, X-ray diffraction, scanning electron microscopy and microhardness tester respectively. The results show that when the mass ratio of CrFe, FeAl and Ti is 2: 2: 1, the surface of the coating is relatively smooth, without defects of pores, cracks and over-melting. Laser in-situ synthesis of three kinds of composite coatings containing Cr2O3, Al2O3, Cr7C3, SiC and other hard ceramic phases were distributed evenly without defects such as pits and cracks, and the composite coating formed a good metallurgical bond with the substrate. The microhardness values of the three kinds of composite coatings are significantly higher than the substrate, up to 974.9HV0.2, about 4 times the hardness of the substrate.