Ma Yulin, Liu Guang, Wang Xinyu, Zhang Xupeng, Zhang Jun, Cheng Jun
Key Laborotary of Research and Application of Multiple Hard Films, Shenyang University, Shenyang 110044, China.
Northwest Institute for Nonferrous Metal Research, Shaanxi Key Laboratory of Biomedical Metal Materials, Xi'an 710016, China.
Materials (Basel). 2022 Jan 23;15(3):848. doi: 10.3390/ma15030848.
In this study, we address the effect of vacuum heat treatment on the morphology of AlO-3wt.%TiO coating, element diffusion behavior, coating hardness, and corrosion resistance. The pores, cracks, and non-liquefied particles on the as-heat treated coating surface of the vacuum-heat-treated coating were observed and compared with the as-sprayed coating using a scanning electron microscope. The diffusion behavior of the elements in the coating was demonstrated by using a line scanning of a cross-section of the coating. Hardness and corrosion-resistance test results were used to judge the effect of a vacuum heat treatment on the coating. The research results show that compared with atmospheric heat treatment, the vacuum heat treatment had less effect on the pores, cracks, and non-liquefied particles on the surface of the coating. However, in the absence of new oxide formation, the pores and cracks in the cross-section of the coating were significantly improved by the vacuum heat treatment. The surface hardness and corrosion resistance of the coating were significantly improved. The crack defects were eliminated, and the uniformity of TiO distribution was improved, which are the main factors that improved the coating performance after vacuum heat treatment. The combination of the coating and the substrate is strengthened, and an AlO and TiO interdiffusion zone is formed when the coating undergoes vacuum heat treatment, which is the main mechanism improving the performance of the AT3 coating.
在本研究中，我们探讨了真空热处理对AlO-3wt.%TiO涂层的形貌、元素扩散行为、涂层硬度和耐腐蚀性的影响。使用扫描电子显微镜观察了真空热处理涂层在热处理后的涂层表面上的孔隙、裂纹和未液化颗粒，并与喷涂后的涂层进行了比较。通过对涂层横截面进行线扫描来证明涂层中元素的扩散行为。硬度和耐腐蚀性测试结果用于判断真空热处理对涂层的影响。研究结果表明，与大气热处理相比，真空热处理对涂层表面的孔隙、裂纹和未液化颗粒的影响较小。然而，在没有形成新氧化物的情况下，真空热处理显著改善了涂层横截面中的孔隙和裂纹。涂层的表面硬度和耐腐蚀性显著提高。裂纹缺陷被消除，TiO分布的均匀性得到改善，这是真空热处理后涂层性能提高的主要因素。涂层与基体的结合得到加强，涂层在进行真空热处理时形成了AlO和TiO互扩散区，这是提高AT3涂层性能的主要机制。
