中文摘要：

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。

英文摘要：

Cr-Fe-Al-Ti-C composite coatings were prepared by flame spraying and laser in situ synthesis technology on surface of Hastelloy alloy by use of CrFe , FeAl, Ti and 304 stainless steel powder as coating raw materials .The macromorphology , microstructure and micro-hardness of composite coatings were investigated by means of optical microscopy , X-ray diffractometer , scanning election microscopy , micro-hardness tester respectively .The results show that surface of the composite coating is smooth and there is no defects of porous , cracks and over-melten when the powder mass ratio of CrFe , FeAl and Ti is 2∶2∶1.Three kinds of composite coatings prepared by laser in situ synthesis contain Cr2 O3 , Al2 O3 , Cr7 C3 and SiC hard ceramic phases .The microstructure of the composite coatings distributes dispersedly and evenly and there are no pits and cracks .A good metallurgical bonding is formed between the composite coatings and substrate .Compared with the substrate, the microhardness of the three kinds of composite coatings increase significantly .The highest hardness of the composite coatings is up to 974.9 HV0.2, which is about 4 times as much as that of substrate .