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    高速电弧喷涂FeNiCrTiB/Cr3C2涂层的组织结构及其高温氧化行为

    Microstructure and High Temperature Oxidation Resistance of FeNiCrTiB/Cr3C2 Coating Deposited by High Velocity Arc Spray

      摘要
    • 摘要: 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200 h后涂层的氧化质量增量为1.58 mg·cm-2, 远小于20G钢的氧化质量增量(24.85 mg·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。

       

      Abstract: The metal-ceramic composite coating FeNiCrTiB/Cr3C2 with high temperature corrosion resistance was prepared by high velocity arc spray (HVAS). The optical microscopy, scanning electron microscopy and X-ray diffraction were used to analyze microstructure and oxidation products of the coating. The high temperature oxidation resistance of FeNiCrTiB/Cr3C2 coating was compared with that of bare 20G steel. The high temperature oxidation mechanism of the coating was investigated. The results showed that microstructure of HVAS FeNiCrTiB/Cr3C2 coating was the typical layer structure. Some pores and oxides were distributed on coating. After oxidation in 650 ℃ for 200 h, the weight gain of the FeNiCrTiB/Cr3C2 coating was 1.58 mg·cm-2, which was much less than that of the bare 20G steel (24.85 mg·cm-2). The formation of the compact Fe, Cr composite oxides was responsible for the protection of the coating from further oxidation.

       

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