Study on interfacial thermal stability of SiC<sub>f</sub>/TC25G composites

Sun Wu; Zhang Yuming; Yang Lina; Yang Qing; Liu Di; Wang Yumin

doi:10.7513/j.issn.1004-7638.2024.05.010

Volume 45 Issue 5

Oct. 2024

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Sun Wu, Zhang Yuming, Yang Lina, Yang Qing, Liu Di, Wang Yumin. Study on interfacial thermal stability of SiCf/TC25G composites[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(5): 74-82. doi: 10.7513/j.issn.1004-7638.2024.05.010

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Sun Wu, Zhang Yuming, Yang Lina, Yang Qing, Liu Di, Wang Yumin. Study on interfacial thermal stability of SiC_f/TC25G composites[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(5): 74-82. doi: 10.7513/j.issn.1004-7638.2024.05.010

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Study on interfacial thermal stability of SiC_f/TC25G composites

doi: 10.7513/j.issn.1004-7638.2024.05.010

Sun Wu^{1, 2
,},
Zhang Yuming²,
Yang Lina^{2
,
,},
Yang Qing²,
Liu Di¹,
Wang Yumin²

1.
School of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, Liaoning,China
2.
Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning,China

More Information

Received Date: 2024-04-16
Available Online: 2024-10-30
Publish Date: 2024-10-30

Abstract

Abstract

The prolonged exposure of TMCs to high temperatures results in severe interfacial reactions between the matrix and the fiber, leading to a degradation in the mechanical properties of the composites. In this study, SiC_f/TC25G composites were prepared using a magnetron sputtering precursor wire method followed by hot isostatic pressing process. The interface reaction and thermal stability of the composites were investigated. Specifically designed interfacial thermal stability experiments under different thermal exposure conditions were conducted based on the service temperature of TC25G titanium alloy. The resulting interfacial morphology and products of the composites under hot isostatic pressure and hot exposure were analyzed using various techniques including SEM, TEM, EPMA, XRD, and EBSD techniques. The primary product of the interface reaction layer in SiC_f/TC25G composites under hot isostatic pressure is validated as TiC, and the silicides in the reaction layer near the matrix side and the matrix precipitate in the form of (Ti, Zr)₆Si₃. As thermal exposure temperature and holding time increased, both the thickness of the interface reaction layer increases while that of the C coating decreases. Based on these observations, a growth law for SiC_f/TC25G composite was summarized. The activation energy for the growth of the interfacial reaction layer in SiC_f/TC25G composites is 50.53 kJ /mol, and the exponential factor for the reaction layer growth is 1.23×10⁻⁷ m/s^1/2.
- titanium matrix composites,
- TC25 G,
- SiC fiber,
- thermal stability,
- interfacial reaction

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References(26)

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