激光熔覆Ti基NiAlSi合金涂层的组织及高温抗氧化性能研究 |
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引用本文: | 张清郁,原涛. 激光熔覆Ti基NiAlSi合金涂层的组织及高温抗氧化性能研究[J]. 粉末冶金技术, 2018, 36(5): 331. DOI: 10.19591/j.cnki.cn11-1974/tf.2018.05.002 |
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作者姓名: | 张清郁 原涛 |
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作者单位: | 1.河南工业贸易职业学院机电工程系, 郑州 450053 |
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摘 要: | 通过激光熔覆工艺在Ti4合金表面生成了NiAlSi涂层,分析了涂层物相组成、显微组织结构及在860℃时的抗氧化性能。研究结果表明:Ti4合金和涂层的结合部位形成了熔合线,可以推断涂层和钛合金之间形成了良好的冶金结合状态,且在涂层的底部区域形成了众多的柱状晶,涂层中包含了Ti5Si3与Al3Ni2两种主要成分。涂层的耐高温氧化性能优于钛合金,经过40 h的高温氧化处理后,粉末涂层的质量增加值是2.19 mg·cm-2,比Ti4合金的耐高温氧化性能提高了12倍左右。在860℃下进行40 h氧化处理,涂层与氧化膜之间保持紧密结合状态,未看到有脱落情况出现,氧化膜的主要成分是Al2O3。
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关 键 词: | 激光熔覆 钛合金 涂层 显微组织 高温氧化 |
收稿时间: | 2018-04-24 |
Study on microstructures and high temperature oxidation resistance of Ti-based NiAlSi alloy by laser cladding |
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Affiliation: | 1.Department of Mechanical and Electrical Engineering, Henan Industrial and Trade Vocational College, Zhengzhou 450053, China2.Department of Mechanical Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China |
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Abstract: | The NiAlSi coating on Ti4 alloy surface was generated by laser cladding, the phase composition, microstructures, and oxidation resistance at 860 of the Ti℃ -based NiAlSi alloy were analyzed. The results show that, the fusion line is present at the interface of Ti4 ally and coating, which can be deduced that there is a good metallurgical combination between titanium alloy and coating. The numerous columnar crystals are formed in the coating bottom, and the major components of coating are composed of Ti5Si3 and Al3Ni2. The coating has higher oxidation resistance than titanium alloy. After high-temperature oxidation treatment for 40 h, the mass increase of coating is 2.19 mg·cm-2, which is about 12 times higher than that of Ti4 alloy. After the oxidation treatment for 40 h at 860℃, the combination between coating and oxide film remains tied closely without peeling, and the main component of oxide film is Al2O3. |
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