Oxidation behaviour and microstructure of a dense MoSi2 ceramic coating on Ta substrate prepared using a novel two-step process |
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| Affiliation: | 1. School of Materials Science and Engineering, Central South University, Changsha, Hunan, 410083, China;2. Center for Mineral Materials, School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, Hunan, China;3. Key Laboratory of Non-ferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha, 410083, China;4. Department of Materials Engineering, Rensselaer Polytechnic Institute, Troy, New York, 12180, USA;1. School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, PR China;2. Key Laboratory of No-ferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha, Hunan 410083, PR China;1. School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, China;2. Key Laboratory of Non-ferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha, Hunan 410083, China;1. School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, PR China;2. Key Laboratory of No-ferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha, Hunan 410083, PR China;3. School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, PR China;1. School of Metallurgy and Environment, Central South University, Changsha, Hunan 410083, China;2. School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, China;3. School of Materials and Metallurgy, Northeastern University, Shenyang, Liaoning 110004, China;4. Key Laboratory of Advanced Materials Manufacturing Technology of Liaoning Province, Shenyang University, Shenyang, Liaoning 110044, China;5. Department of Mechanical and Industrial Engineering, Ryerson University, Toronto, Ontario M5B 2K3, Canada |
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| Abstract: | Tantalum (Ta) alloys are important ultra-high-temperature structural materials owing to their excellent high-temperature mechanical properties and processability. However, they exhibit poor high-temperature oxidation resistance. In this study, a dense MoSi2 ceramic coating was prepared on a Ta substrate using an innovative multi-arc ion plating process and halide activated pack cementation in order to improve its ultra-high-temperature oxidation resistance. This ceramic coating exhibited a low roughness space arithmetic (287.1 ± 26.3 nm) and a dense structure. The relationship between the thickness of the coating and the duration of pack-cementation at 1250 ℃ was parabolic. The coating had a service life of more than 12 h at 1750 ℃, and showed excellent high-temperature oxidation resistance because of the uniform and dense structure of the coating and the rapid formation of a dense SiO2 layer with low O2 permeability during high-temperature oxidation. |
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| Keywords: | Tantalum Silicide coating Multi-arc ion plating Pack cementation |
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