热处理对铝基钛坯涂层高温抗氧化性能的影响

Effect of heat treatment on the oxidation resistance of Al-based coatings of titanium ingot

摘要:

将Al粉、Sn粉、SiO₂粉、苯丙乳液、聚乙烯醇、羧甲基纤维素等原料,按照一定配比制备铝基高温抗氧化涂层,探讨不同热处理温度和热处理时间对涂层高温抗氧化性的影响。分别选用金相显微镜、场发射扫描电镜、能谱分析仪和X射线衍射仪等研究裸露面和喷涂面的金相组织、涂层的微观形貌、元素扩散和相组成。结果表明,铝基高温抗氧化涂层能够阻止钛坯热加工过程中表面氧化皮的产生,扩散层夹层形成了具有良好防护作用的Al₂O₃-TiAl和TiAl₃-Ti相,且涂层在1050 ℃,8 h防护效果较好。

Abstract:

High temperature oxidation resistance coating were prepared by a certain ratio of Al powder, Sn powder, SiO2 powder, styrene acrylic emulsion, polyvinyl alcohol, sodium carboxymethyl cellulose mixed. The effects of different heat treatment temperature and heat treatment time on antioxidant properties were discussed. The microstructure of the exposed surface and spraying surface, coating microstructure, elements diffusion and interface phase structure were analyzed by optical microscope, field emission scanning electron microscopy, energy spectrum analysis instrument and X-ray photoelectron, respectively. The results show that aluminum high temperature oxidation coating effectively prevent surface oxide production formed on the surface of titanium ingot during thermal processing, Al₂O₃-TiAl and TiAl₃-Ti phase with a good protective effect are formed in the interlayer, it is worthy noted that the excellent heat treatment temperature and holding time are 1050 ℃ and 8 h, respectively.