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以Al-TiC混合粉末为原材料,采用激光表面合金化技术,在电解镍基材表面原位合成了TiC增强Ni3Al基复合涂层,分析了涂层的显微组织结构,通过溶解热力学计算研究了TiC的溶解及析出规律,对比了原始TiC粉末与原位析出TiC颗粒的形貌特征。结果表明:涂层主要由金属陶瓷相TiC及金属间化合物Ni3Al组成,激光表面合金化过程中,原始TiC粉末在Ni-Al合金熔体中发生溶解,然后在合金熔池中重新凝固析出,以原位增强颗粒的形式弥散分布于Ni3Al金属间化合物基体上,原位析出的TiC增强颗粒尺寸显著小于原始TiC粉末。
TiC reinforced Ni3Al-based composite coating was synthesized in-situ on the surface of electrolytic nickel substrate with Al-TiC mixed powder as raw material by laser surface alloying technique. The microstructure of the coating was analyzed and the microstructure of the coating was analyzed by thermodynamic calculation TiC dissolution and precipitation law, compared the original TiC powder and TiC precipitated in situ morphology. The results show that the coating mainly consists of the cermet phase TiC and the intermetallic compound Ni3Al. During the laser surface alloying, the original TiC powder dissolves in the Ni-Al alloy melt and then re-solidifies in the molten pool The in-situ enhanced particles dispersedly distributed on the Ni3Al intermetallic matrix. The size of in-situ precipitated TiC particles was significantly smaller than that of the original TiC powders.