Ultra-high temperature oxidation resistance of a novel (Mo,Hf, W,Ti)Si2 ceramic coating with Nb interlayer on Ta substrate |
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| Affiliation: | 1. School of Materials Science and Engineering, Central South University, Changsha 410083, Hunan, China;2. Center for Mineral Materials, School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, Hunan, China;3. Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, Hunan, China;4. State Key Laboratory of Rare Metal Special Materials, Northwest Rare Metal Research Institute, Shizuishan 753000, Ningxia, China;1. DISAT, Politecnico di Torino, Torino, Italy;2. Fraunhofer Institute for Ceramic Technologies and Systems IKTS, Dresden, Germany;3. Department of Ceramic Materials Engineering, University of Bayreuth, Bayreuth, Germany;1. School of Metallurgy, Northeastern University, No. 3-11, Wenhua Road, Heping District, Shenyang, Liaoning 110819, PR China;2. Department of Materials Science and Engineering, and Research Institute of Advanced Materials (RIAM), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, South Korea;1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, Shaanxi, China;2. School of Materials Engineering, Xi’an Aeronatical University, Xi’an 710077 China;3. Shaanxi Huaqin Technology Industry Co., Ltd, Xi’an, China;4. Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China;5. The Third Affiliated Hospital of Air Force Medical University, Xi’an 710032, Shaanxi, China;1. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, PR China;2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China;3. National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150080, PR China;4. School of Materials Science and Engineering, Anhui Polytechnic University, Wuhu 241000, PR China |
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| Abstract: | In order to solve the challenge of recyclability of tantalum substrates in high temperature oxidation environments, a novel MoSi2-WSi2-HfSi2-TiSi2 composite ceramic coating containing an Nb interlayer was prepared on the surface of tantalum substrate by a three-step method. The mix ceramic silicide coating exhibited superior performance and effective protection for 10.2 h at 1800 °C, possibly due to the formation of an outer SiO2-HfO2-HfSiO4 composite oxide film with low oxygen permeability, moderate viscosity and thermal expansion coefficient, as well as good self-healing ability. Furthermore, the coating successfully passed 537 thermal cycles from room temperature to 1800 °C. The presence of Nb interlayer significantly mitigated the thermal mismatch between the ceramic coating and the tantalum substrate, and the bidirectional diffusion of Nb element during the high temperature oxidation and thermal shock process further reduced the tendency of the coating to crack. |
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| Keywords: | Silicide Ceramic coating Nb interlayer Oxidation behavior |
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