Refractory metal silicides reinforced by in-situ formed Nb2O5 fibers and mullite nanoclusters |
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| Affiliation: | 1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;2. School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, China;1. Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150001, China;2. Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology, Harbin Institute of Technology, Harbin, 150001, China;1. School of Materials Science and Engineering, Tsinghua University, Beijing 100084, PR China;2. Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Beijing 100084, PR China;3. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, PR China;4. State Key Laboratory of New Ceramics and Fine Processing, Beijing 100084, PR China;1. Key Laboratory of Functional Materials and Applications of Fujian Province, Xiamen University of Technology, Xiamen 361024, PR China;2. The Key Laboratory for Power Metallurgy Technology and Advanced Materials of Xiamen, Xiamen University of Technology, Xiamen 361024, PR China |
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| Abstract: | There is keen interest in the use of refractory metal silicides as structural materials or thermal barrier coatings for a high temperature environment. However, a long-standing problem for these materials is their poor thermal shock property. To address this challenge, Nb-Al-SiC elements were introduced into the MoSi2 matrix and consolidated by in-situ hot pressing. We find that this treatment leads to improved performance of MoSi2 composites in high temperature thermal shock resistance and bending strength. After in-situ HPing, the Nb, Al2O3 particles, and SiC nanoclusters were uniformly dispersed in the MoSi2 matrix and inhibited the movement of dislocation, resulting in a strengthening effect. During the thermal shock process, the fragmentized oxide layer present in the surface of the pure MoSi2 alloy disappeared completely, and a dense multi-component oxide layer was formed in-situ on the surface of the MoSi2 composites. The dense multi-component oxide layer was composed of SiO2 glass, fiber-structured Nb2O5, and nano-sized mullite phases. The fiber structured and nano-sized oxide phases play an important role in strengthening the oxide layer. |
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| Keywords: | Refractory metal silicides In-situ hot pressing Thermal shock resistance Bending strength |
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