Formation and oxidation behavior of Ni2Al3 coating on heat-resistant Ti-alloy |
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| Affiliation: | 1. São Paulo State University (UNESP), School of Veterinary Medicine and Animal Science, Botucatu 18618-000, São Paulo, Brazil;2. São Paulo State University (UNESP), College of Technology and Agricultural Sciences, Dracena 17900-000, São Paulo, Brazil;1. School of Advanced Materials Science & Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 16419, Republic of Korea;2. Visual Display Business, Samsung Electronics Co., Ltd., 129, Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16677, Republic of Korea;3. Global Technology Center, Samsung Electronics Co., Ltd., 129, Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16677, Republic of Korea |
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| Abstract: | A nickel aluminide coating process, developed on heat resistant Ti alloy by electroplating a Ni film followed by high Al activity pack cementation, forms a duplex layer structure, an outer Ni2Al3 layer and an inner TiAl3/TiAl2/TiNiAl2 layer. The coated Ti-alloy was oxidized in air for up to 3,600 ks (1,000 h) under thermal cycling between room temperature and 1023 K. A protective Al2O3 scale formed with little oxide exfoliation and the oxidation amount was 6 g/m2 after the 3,600 ks oxidation. It was found that after 3,600 ks oxidation at 1023 K the coating layer structure was essentially unchanged, similar to the as-formed, except that the TiAl3 layer had changed to TiAl2. |
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