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以Ni-Mo-Si-C-Ti混合粉末为原料,利用等离子熔敷技术在Q235基材表面原位合成了以MoSi_2和TiC为增强相,以γ-(Ni,Fe)为主要基体相的耐磨抗高温氧化复合涂层。利用XRD、OM、SEM、EDS分析了涂层及氧化膜的显微结构和相组成,测试了涂层在1000℃恒温氧化条件下的抗氧化性能。结果表明:涂层组织致密、细小,具有快速凝固显微组织特征,与基材呈良好的冶金结合;涂层显微组织为不规则块状初生相MoSi_2和颗粒状TiC金属陶瓷初生相弥散分布于强韧性良好的γ-(Ni,Fe)过饱和固溶体基体上;涂层氧化膜主要组成相为SiO_2、TiO_2和少量Fe_2O_3,氧化动力学曲线近似符合抛物线规律,复合涂层具有良好的抗高温氧化性能。
Using Ni-Mo-Si-C-Ti mixed powder as raw material, MoSi_2 and TiC as reinforcing phases and γ- (Ni, Fe) as main matrix phases were synthesized on the surface of Q235 substrate by plasma deposition Wear resistant high temperature oxidation composite coating. The microstructure and phase composition of the coating and the oxide film were analyzed by XRD, OM, SEM and EDS. The oxidation resistance of the coating at 1000 ℃ was tested. The results show that the microstructure of the coating is dense and fine, with the characteristics of rapid solidification microstructure and good metallurgical bonding with the substrate. The microstructure of the coating is the disperse distribution of the primary phase of irregular massive primary phase MoSi_2 and granular TiC cermet On the super tough solid γ- (Ni, Fe) supersaturated solid solution matrix, the main phase of coating oxide film is SiO_2, TiO_2 and a small amount of Fe_2O_3, the oxidation kinetic curve approximates the parabolic law, and the composite coating has good anti-high temperature Oxidation performance.