铝基钛坯涂层的制备及其高温抗氧化性能

Preparation of Al-based Coatings of Titanium Ingot and Its High Temperature Oxidation Resistance

将Al粉、Sn粉、SiO_2粉、苯丙乳液、聚乙烯醇和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保温时间对涂层高温抗氧化性的影响。采用光学显微镜、场发射扫描电镜、能谱分析仪和X射线衍射仪研究喷涂和未喷涂表面的微观形貌、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在热加工过程中产生表面氧化,在过渡层中形成了具有良好防护作用的Al2O3-Ti Al相和Ti Al3-Ti相,且较适宜的处理温度为1050℃保温时间为8 h。

High temperature oxidation resistant coatings were prepared by mixing Al powder, Sn powder, SiO_2 powder, styrene acrylic emulsion, polyvinyl alcohol and sodium carboxymethyl cellulose according to the determined ratio. The effects of heat treatment temperature and holding time on anti-oxidation properties were discussed. The microstructure of the coated surface and uncoated surface, elements diffusion and interface phase structure were analyzed by light microscope, field emission scanning electron microscopy, energy spectrum analysis instrument and X-ray diffraction instrument. The results show that the aluminum based high temperature oxidation coating effectively prevents surface oxidation scale forming on the surface of titanium ingot during thermal processing. Al_2O_3-TiAl and TiAl3-Ti phase with good protective properties are formed in the transition layer, and it is worthy to note that good oxidation resistant effect is achieved when heat treatment temperature is 1050 ° and holding time is 8 h.