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采用消失模铸造工艺,进行了镁合金表面制备合金化/陶瓷化复合层研究。选用金属铝粉作为合金化主要元素,PbO-ZnO-Na2 O系低温玻璃粉为制备陶瓷涂层的主要材料。在真空度为-0.06 MPa,温度为800℃条件下浇注,在基体的表面形成了一定厚度合金化/陶瓷化复合层,用来提高基体的耐磨和耐蚀性。扫描电镜、线扫描分析、能谱分析用于研究复合层的微观组织结构和成分分布。与单一的表面陶瓷化相比,表面的陶瓷层和合金层形成良好的结合界面。显微硬度测试表明,从表面至基体复合层的硬度成梯状分布,硬度值的变化与单一的陶瓷层相比有一个过渡区,合金层有利于提高表面陶瓷层与基体的界面结合质量。
Using the lost foam casting process, the alloying / ceramization of magnesium alloy was studied. As the main element of alloying, aluminum powder is selected as the main material for preparing ceramic coating. Casting at a vacuum of -0.06 MPa and a temperature of 800 ° C, a certain thickness of the alloyed / ceramized composite layer is formed on the surface of the substrate to improve the wear resistance and corrosion resistance of the substrate. Scanning electron microscopy, line scan analysis and energy spectrum analysis were used to study the microstructure and composition distribution of the composite layer. Compared with a single surface ceramic, the surface of the ceramic layer and the alloy layer to form a good bonding interface. The microhardness test shows that the hardness of the composite layer from the surface to the matrix is distributed in a ladder shape, and the change of the hardness value has a transition zone compared with the single ceramic layer. The alloy layer is favorable for improving the interface bonding quality of the surface ceramic layer and the substrate.