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采用溶胶-凝胶法在铝合金表面制备无机耐磨陶瓷涂层,考察了不同配比的SiO2溶胶对涂层表面质量、显微硬度以及与基体的界面结合情况的影响,并研究了陶瓷涂层的形成机制。结果表明,当SiO2溶胶的配比中,正硅酸乙酯与水、乙醇的摩尔比为1∶1∶10时,得到的涂层表面平整紧实,显微硬度最高。微观分析发现涂层和基体发生了一定程度的化学反应,涂层中出现了AlN、Al3SiCr、Al0.7Fe3Si0.3等新相,表明界面出现过渡层。溶胶与陶瓷粉体制备的复合涂料,使得涂层能在较低温度下完成烧结,从而在铝合金表面得到致密的陶瓷涂层。
The inorganic wear resistant ceramic coating was prepared on the surface of aluminum alloy by sol-gel method. The effects of different proportions of SiO2 sol on the surface quality, microhardness and interfacial bonding with the substrate were investigated. Layer formation mechanism. The results show that when the molar ratio of TEOS to water and ethanol is 1: 1: 10, the resulting coating has a smooth and compact surface with the highest microhardness. The microscopic analysis shows that the coating and the substrate undergo a certain degree of chemical reaction, and new phases such as AlN, Al3SiCr and Al0.7Fe3Si0.3 appear in the coating, indicating a transition layer at the interface. Sol and ceramic powder composite coatings, making the coating can be sintered at lower temperatures to obtain a dense ceramic coating on the surface of the aluminum alloy.