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      High temperature mechanical retention characteristics and oxidation behaviors of the MoSi 2(Cr 5Si 3)–RSiC composites prepared via a PIP–AAMI combined process

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          Abstract

          In the present paper, MoSi 2(Cr 5Si 3)–RSiC composites were prepared via a combination of precursor impregnation pyrolysis (PIP) and MoSi 2–Si–Cr alloy active melt infiltration (AAMI) process. Composition, microstructure, mechanical retention characteristics, and oxidation behaviors of the composites at elevated temperature were studied. X-ray diffraction (XRD) pattern confirms that the composites mainly compose of 6H–SiC, hexagonal MoSi 2, and tetragonal Cr 5Si 3. Scanning electron microscopy (SEM) image reveals that nearly dense MoSi 2(Cr 5Si 3)–RSiC composites exhibiting three-dimensionally (3D) interpenetrated network structure are obtained when infiltrated at 2173 K, and the interface combination of the composites mainly depends on the composition ratio of infiltrated phases. Oxidation weight gain rate of the composites is much lower than that of RSiC matrix, where MoSiCr2 possesses the lowest value of 0.1630 mg·cm −2, about 78% lower than that of RSiC after oxidation at 1773 K for 100 h. Also, it possesses the highest mechanical values of 139.54 MPa (flexural strength σ f and RT) and 276.77 GPa (elastic modulus E f and RT), improvement of 73.73% and 29.77% as compared with that of RSiC, respectively. Mechanical properties of the composites increase first and then decrease with the extension of oxidation time at 1773 K, due to the cooperation effect of surface defect reduction via oxidation reaction and thermal stress relaxation in the composites, crystal growth, and thickness increase of the oxide film. Fracture toughness of MoSiCr2 reaches 2.24 MPa·m 1/2 (1673 K), showing the highest improvement of 31.70% as compared to the RT value.

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          Author and article information

          Journal
          J Adv Ceram
          Journal of Advanced Ceramics
          Tsinghua University Press and Springer-Verlag Berlin Heidelberg (USA )
          2227-8508
          2226-4108
          01 June 2019
          01 October 2019
          : 8
          : 2
          : 196-208
          Affiliations
          aCollege of Materials Science and Engineering, Hunan University, Changsha 410082, China
          bHunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology, Hunan University, Changsha 410082, China
          cHunan Province Key Laboratory for Spray Deposition Technology and Application, Hunan University, Changsha 410082, China
          Author notes
          *Corresponding author: Peng-zhao GAO, E-mail: gaopengzhao7602@ 123456hnu.edu.cn
          Article
          s40145-018-0305-1
          10.1007/s40145-018-0305-1
          Copyright © The Author(s)

          This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. See https://creativecommons.org/licenses/by/4.0/.

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