纳米ZrO2激光重熔涂层组织与性能分析

Analysis of microstructure and nanostructured ZrO2 laser glazed coating

关键词:  纳米氧化锆涂层  激光重熔  比能量  表面形貌  热震性能

Key words:  nanostructured ZrO₂ coating  laser glazing  specific energy  surface morphology  thermal shock resistance

摘要:

采用金相试验、扫描电镜试验、热震试验和显微硬度试验对不同激光重熔工艺下的Y₂O₃部分稳定ZrO₂纳米陶瓷涂层组织与性能进行研究.重点分析了涂层重熔宽度与深度、表面形貌、显微硬度和热震性能随激光比能量的变化规律.结果表明,ZrO₂纳米陶瓷涂层的重熔深度和宽度随着激光比能量的增大而增加;涂层的表面成形与激光比能量密切相关;涂层的显微硬度随激光比能量的增大而升高;激光比能量对涂层热震性能的影响十分明显,当激光比能量为37.2 J/mm²时重熔涂层的热震性能最好。

Abstract:

The nanostructured ZrO₂ laser glazed coating was produced with different glazing processing parameters.Experiments were done to investigate the microstructure and properties.The investigation methods include optical and scan electron microscopy test, microhardness test and thermal shock test.In addition, the change rules of microstructure and properties were discussed.The results show that the depth, width and microhardness of the coating increase with the laser specific energy being increased.Microstructure test and thermal shock test show that the surface morphology and thermal shock resistance of the coating have relation to the laser specific energy.When the specific energy is about 37.2 J/mm², the laser glazed coating exhibits the best thermal shock resistance.