Aluminizing of TiAl-Based Alloy Using Thermal Spray Coating
Aluminizing of TiAl-Based Alloy Using Thermal Spray Coating
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DOI：
10.4028/www.scientific.net/msf.654-656.1884
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发表时间：
2010-06
期刊：
影响因子：
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通讯作者：
T. Sasaki;T. Yagi;Takehiko Watanabe
中科院分区：
文献类型：
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作者：
T. Sasaki;T. Yagi;Takehiko Watanabe
对TiAl基合金(49.1 at%Al)进行了热喷涂和1100℃扩散处理的渗铝处理，研究了扩散时间对渗层中TiAl金属间化合物相形成和渗铝TiAl基合金抗氧化性能的影响。在最外表面形成的涂层由富铝金属间化合物T2iAl5组成，并含有孔洞。另一方面，在最外层和衬底之间形成了由TiAl2和TiAl组成的中间层。最外层的厚度随着扩散时间的增加而减小，而中间层的厚度随着扩散时间的增加而增加。此外，随着中间层的生长，涂层/基材界面由波浪型转变为线型。渗铝涂层在900℃下所有扩散次数下均表现出良好的抗氧化性。
Aluminizing the surface of a TiAl-based alloy (49.1 at% Al) was carried out by thermally spraying a pure aluminum coating and subsequent diffusion treatment at 1100°C. The influence of the diffusion time for the formation of Ti-Al intermetallic phases in the coating layers and the oxidation resistance of the aluminized TiAl-based alloys were investigated. The layer formed on the outermost surface was comprised of the Al-rich intermetallic T2iAl5 and contained pores. On the other hand, an intermediate layer consisting of TiAl2 and TiAl was formed between the outermost layer and the substrate. The thickness of the outermost layer decreased as the diffusion time increased, while the thickness of the intermediate layer increased. In addition, the coating/substrate interface changed from a wavy to a linear form with the growth of the intermediate layer. The aluminized coating showed good oxidation resistance at 900°C for all diffusion times.