采用高速电弧喷涂技术制备FeNiCrTiB/Cr3C2耐高温金属陶瓷复合涂层。利用光学显微镜、扫描电镜、X射线衍射等手段研究涂层的组织结构以及氧化产物,并与传统锅炉用钢20G钢对比,分析涂层的抗氧化机理。结果表明:FeNiCrTiB/Cr3C2涂层为典型的层状结构,且涂层上分布着少量的孔隙和氧化物;650℃氧化200h后涂层的氧化质量增量为1.58mg·cm-2,远小于20G钢的氧化质量增量(24.85mg·cm-2);涂层在氧化过程中生成致密的具有保护性的铁、铬的复合氧化膜,阻塞氧的扩散通道,阻止进一步氧化,从而提高涂层的抗高温氧化性能。 Preparation of FeNiCrTiB / Cr3C2 high temperature cermet composite coating by high speed arc spraying. The microstructure and oxidation products of the coating were studied by means of optical microscope, scanning electron microscope and X-ray diffraction. Compared with the conventional steel 20G steel for boiler, the anti-oxidation mechanism of the coating was analyzed. The results show that the FeNiCrTiB / Cr3C2 coating is a typical layered structure with a small amount of pores and oxides distributed on the coating. The oxidation mass increment of the coating at 650 ℃ for 200h is 1.58mg · cm-2, which is much smaller than 20G steel oxidation mass increment (24.85mg · cm-2); coating in the oxidation process to generate a dense protective iron and chromium composite oxide film, block oxygen diffusion channels to prevent further oxidation, thereby enhancing the coating Layer of high temperature oxidation resistance.