Influence of FLiNaK Salt Impregnation on Mechanical Properties of 2D Woven C/C Composite

doi:10.11901/1005.3093.2020.287

Chinese Journal of Materials Research

2021, Vol. 35

Issue (10): 778-784 DOI: 10.11901/1005.3093.2020.287

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Influence of FLiNaK Salt Impregnation on Mechanical Properties of 2D Woven C/C Composite

BAI Longteng¹^,²(

), CHENG Laifei², YANG Xiaohui¹^,²

^1.Northwestern Polytechnical University, Xi'an 710072, China
^2.Xi'an Aerospace Propulsion Institute, Xi'an 710010, China

Cite this article:

BAI Longteng, CHENG Laifei, YANG Xiaohui. Influence of FLiNaK Salt Impregnation on Mechanical Properties of 2D Woven C/C Composite. Chinese Journal of Materials Research, 2021, 35(10): 778-784.

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Abstract

Impregnating molten LiF-NaF-KF salt (46.5%-11.5%-42.0%,mole fraction, FLiNaK) into a 2D woven C/C composite was performed at 650℃ under different pressure. The mass gain, the change of density and mechanical properties of the 2D woven C/C composite after FLiNaK salt impregnation were measured. The FLiNaK salt distribution in the 2D woven C/C composite was observed by X-ray CT and SEM. The results show that the mass gain of the 2D woven C/C composite increased with the increasing impregnation pressure. FLiNaK salt distributed within open pores of the composite and fissures of fiber bundles and interlaminar fractures. The compressive strength and flexural strength of the 2D woven C/C composite increased with the increasing impregnation pressure. The coupling effect of densification induced by FLiNaK salt impregnation and residual stress formed in 2D woven C/C composite could be benefitial to the mechanical property of the C/C composite.

Key words: composite mechanical property molten salt impregnation X-ray CT

Received: 14 July 2020

ZTFLH:

TB332

Fund: National Natural Science Foundation of China(51632007)

About author: BAI Longteng, Tel: 15902965891, E-mail: blt9520@163.com

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https://www.cjmr.org/EN/10.11901/1005.3093.2020.287 OR https://www.cjmr.org/EN/Y2021/V35/I10/778

Fig.1 Pore size distribution curve of the 2D woven C/C composite

Fig.2 Mass of the 2D woven C/C composite with pressure (a), mercury intrusion with pressure (b) and density with pressure (c)

Table 1 Correlation between impregnation pressure and the corresponding pore size

Fig.3 Change of compressive strength (a, b) and flexural strength (c, d) before and after FLiNaK salt impregnation

Fig.4 Orthogonal slice and 3D reconstruction image of original the 2D woven C/C composite before impregnation (a, b); after impregnation in 0.2 MPa FLiNaK salt impregnation (c, d), in 0.4 MPa FLiNaK salt (e, f) and in 0.6 MPa FLiNaK salt (g, h)

Fig.5 SEM images of the fracture surface of the 2D woven C/C composite before impregnation (a) and after impregnation at 0.2 MPa (b), 0.4 MPa (c) and 0.6 MPa (d)

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