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In the present paper, MoSi2(Cr5Si3)-RSiC composites were prepared via a combination of precursor impregnation pyrolysis (PIP) and MoSi2-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 MoSi2, and tetragonal Cr5Si3. Scanning electron microscopy (SEM) image reveals that nearly dense MoSi2(Cr5Si3)-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 σf and RT) and 276.77 GPa (elastic modulus Ef 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·m1/2 (1673 K), showing the highest improvement of 31.70% as compared to the RT value.


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High temperature mechanical retention characteristics and oxidation behaviors of the MoSi2(Cr5Si3)-RSiC composites prepared via a PIP-AAMI combined process

Show Author's information Peng-zhao GAOa,b,c( )Lei CHENGa,b,cZheng YUANa,b,cXiao-pan LIUa,b,cHan-ning XIAOa
College of Materials Science and Engineering, Hunan University, Changsha 410082, China
Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology, Hunan University, Changsha 410082, China
Hunan Province Key Laboratory for Spray Deposition Technology and Application, Hunan University, Changsha 410082, China

Abstract

In the present paper, MoSi2(Cr5Si3)-RSiC composites were prepared via a combination of precursor impregnation pyrolysis (PIP) and MoSi2-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 MoSi2, and tetragonal Cr5Si3. Scanning electron microscopy (SEM) image reveals that nearly dense MoSi2(Cr5Si3)-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 σf and RT) and 276.77 GPa (elastic modulus Ef 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·m1/2 (1673 K), showing the highest improvement of 31.70% as compared to the RT value.

Keywords:

MoSi2(Cr5Si3)-RSiC composites, precursor impregnation pyrolysis and MoSi2-Si-Cr alloy active melt infiltration (PIP-AAMI), high temperature mechanical characteristic, oxidation behavior
Received: 14 July 2018 Revised: 03 November 2018 Accepted: 15 November 2018 Published: 13 June 2019 Issue date: June 2019
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Publication history
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Publication history

Received: 14 July 2018
Revised: 03 November 2018
Accepted: 15 November 2018
Published: 13 June 2019
Issue date: June 2019

Copyright

© The author(s) 2019

Acknowledgements

This work is supported by the National Natural Science Foundation of China (Grant Nos. 51372078 and 51302076), Natural Science Foundation of Hunan Province of China (Grant No. 12JJ4054), Natural Science Foundation of Hunan Province (Grant No. 2018JJ4011), Jiangsu Province Innovative Talent Plan 2016, China, and Yancheng City 515 Talent Plan, China.

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