利用激光熔覆技术在45钢表面制备出不同成分配制的原位自生镍基金属陶瓷复合涂层,涂层表面质量良好。涂层在连续变温条件下高温氧化动力学分析表明,涂层成分不同时,稳定氧化阶段持续时间及剧烈氧化速度均有一定差异。此外,不同成分涂层高温氧化后,氧化层表面形貌、质量及氧化物尺寸、分布均有差别。总体来看,激光熔覆表面处理大大提高了材料表面的高温氧化抗力。
Abstract
In-situ synthesized Ni-base metal-ceramic composite coatings with different proportion of composition were fabricated on 45 steel surface by laser cladding. The main ceramic phase was TiB2 in the coating and its surface quality was fairly good. Analysis of high temperature oxidation kinetics of the coatings in continuous changing temperature showed that the stable oxidation remaining time and the violent oxidation speed was a certain different from each other as the coating composition changing. In addition, the surface morphology quality, size and distribution of the oxide production were different from each other as a result of the changing of the coating composition. In general, the high temperature oxidation resistance of the material surface improved greatly through laser cladding surface modification.
关键词
激光熔覆 /
涂层 /
连续变温 /
高温氧化
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Key words
laser cladding /
coating /
continuous temperatu /
high temperature oxi
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参考文献
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脚注
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基金
国家自然科学基金资助项目(59701001)
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