【摘要】 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MoSi₂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MoSi₂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SiO₂、TiO₂和少量Fe₂O₃,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。更多还原

【Abstract】 A wear and high temperature oxidation resistant composite coating with MoSi₂ and Ti C as reinforcing phase,γ-（ Ni,Fe） as matrix phase was in situ fabricated on Q235 low carbon steel substrate by plasma cladding technology with Ni-Mo-Si-C-Ti mixed alloy powders as precursor material. The microstructure and phases composition of the coating and the oxidation film were analyzed by XRD,OM,SEM and EDS. High temperature oxidation resistance of the coating was tested under 1000℃ isothermal oxidation test condition. The results show that microstructure of the coating is dense and fine. The coating is metallurgically bonded to the Q235 low carbon steel substrate. Primary MoSi₂ irregular blocks and primary Ti C particles are evenly dispersed in the γ-（ Ni,Fe） supersaturated solid solution matrix which has good strength and toughness. The oxidation film is mainly composed of SiO₂,TiO₂ and a small amount of Fe₂O₃. The oxidation kinetics curve of the oxidation film is approximately fitted to the parabolical law,which implies that the coating has excellent high temperature oxidation resistant.更多还原