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Research Article | Open Access

Rare earth monosilicates as oxidation resistant interphase for SiCf/SiC CMC: Investigation of SiCf/Yb2SiO5 model composites

Xirui LVa,bMengkun YUEc,dXue FENGc,dXiaoyan LIc,dYumin WANGeJiemin WANGaJie ZHANGa( )Jingyang WANGa( )
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
AML, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China
Center for Mechanics and Materials, Tsinghua University, Beijing 100084, China
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
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Graphical Abstract


Model composites consisting of SiC fiber and Yb2SiO5 were processed by the spark plasma sintering (SPS) method. The mechanical compatibility and chemical stability between Yb2SiO5 and SiC fiber were studied to evaluate the potential application of Yb monosilicate as the interphase of silicon carbide fiber reinforced silicon carbide ceramic matrix composite (SiCf/SiC CMC). Two kinds of interfaces, namely mechanical and chemical bonding interfaces, were achieved by adjusting sintering temperature. SiCf/Yb2SiO5 interfaces prepared at 1450 and 1500 ℃ exhibit high interface strength and debond energy, which do not satisfy the crack deflection criteria based on He–Hutchison diagram. Raman spectrum analyzation indicates that the thermal expansion mismatch between Yb2SiO5 and SiC contributes to high compressive thermal stress at interface, and leads to high interfacial parameters. Amorphous layer at interface in model composite sintered at 1550 ℃ is related to the diffusion promoted by high temperature and DC electric filed during SPS. It is inspired that the interfacial parameters could be adjusted by introducing Yb2Si2O7–Yb2SiO5 interphase with controlled composition to optimize the mechanical fuse mechanism in SiCf/SiC CMC.


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Journal of Advanced Ceramics
Pages 702-711
Cite this article:
LV X, YUE M, FENG X, et al. Rare earth monosilicates as oxidation resistant interphase for SiCf/SiC CMC: Investigation of SiCf/Yb2SiO5 model composites. Journal of Advanced Ceramics, 2022, 11(5): 702-711.








Web of Science






Received: 03 August 2021
Revised: 03 November 2021
Accepted: 03 December 2021
Published: 21 March 2022
© The Author(s) 2021.

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