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为解决由于热膨胀系数不同而引起的涂层脱落问题,采用溶胶-凝胶法制备玻璃涂层,涂覆于Ni-Cr-Fe金属载体表面。通过XRD和SEM表征载体和涂层的微观结构,超声振动、热冲击和拉伸实验,评价Ni-Cr-Fe金属载体与玻璃涂层的结合能力。实验结果表明,金属载体表面预处理可以提高载体的几何表面积,载体在900℃高温氧化5 h,出现成簇浮凸状形貌。制备的玻璃涂层均匀、致密,厚度约7.8μm,呈非晶态结构。在超声振动实验中脱落率小于20%,热冲击实验中脱落率小于10%,玻璃涂层具有较高的结合强度。
In order to solve the problem of coating loss due to the different thermal expansion coefficient, a glass coating was prepared by sol-gel method and coated on the surface of the Ni-Cr-Fe metal carrier. The microstructure, ultrasonic vibration, thermal shock and tensile test of the support and the coating were characterized by XRD and SEM, and the bonding ability of the Ni-Cr-Fe metal support and the glass coating was evaluated. The experimental results show that the metal carrier surface pretreatment can improve the geometric surface area of the carrier, the carrier oxidized at 900 ℃ for 5 h, and cluster-like appearance appears. The prepared glass coating is uniform and dense, with a thickness of about 7.8 μm and an amorphous structure. In the ultrasonic vibration experiment shedding rate of less than 20%, thermal shock test shedding rate of less than 10%, glass coating has a high bonding strength.