<strong>FLiNaK</strong>熔盐浸渗对<strong>2D C/C</strong>复合材料力学性能的影响

doi:10.11901/1005.3093.2020.287

材料研究学报

2021, Vol. 35

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

研究论文

本期目录 | 过刊浏览

FLiNaK熔盐浸渗对2D C/C复合材料力学性能的影响

白龙腾¹^,²(

), 成来飞², 杨晓辉¹^,²

^1.西北工业大学西安 710072
^2.西安航天动力研究所西安 710010

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

引用本文:

白龙腾, 成来飞, 杨晓辉. FLiNaK熔盐浸渗对2D C/C复合材料力学性能的影响[J]. 材料研究学报, 2021, 35(10): 778-784.
Longteng BAI, Laifei CHENG, Xiaohui YANG. Influence of FLiNaK Salt Impregnation on Mechanical Properties of 2D Woven C/C Composite[J]. Chinese Journal of Materials Research, 2021, 35(10): 778-784.

全文: PDF(3749 KB) HTML

摘要:

在650℃不同压力下将熔融的LiF-NaF-KF盐(46.5%-11.5%-42.0%，摩尔分数，FLiNaK)浸渗入2D C/C复合材料中，测试2D C/C复合材料的增重率、密度和力学性能的变化并用X射线断层扫描(X-ray CT)和扫描电子显微镜(SEM)观察FLiNaK熔盐的分布，研究了FLiNaK熔盐浸渗对2D C/C复合材料力学性能的影响。结果表明，FLiNaK熔盐分布在2D C/C复合材料开放的孔隙中、纤维束中和相邻层的裂缝中；随着浸渗压力的提高2D C/C复合材料的增重率增大、压缩强度和弯曲强度提高。FLiNaK熔盐浸渗产生的“二次增密”作用和2D C/C复合材料中残余应力的耦合效应，使其力学性能提高。

关键词 ：复合材料, 力学性能, 熔盐, 浸渗, X射线CT

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

收稿日期: 2020-07-14

ZTFLH:

TB332

基金资助:国家自然科学基金(51632007)

作者简介: 白龙腾，男，1984年生，硕士

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https://www.cjmr.org/CN/10.11901/1005.3093.2020.287 或 https://www.cjmr.org/CN/Y2021/V35/I10/778

图1 2D C/C复合材料的孔隙分布

图2 2D C/C复合材料的熔盐浸渗量与浸渗压力的关系、进汞量与浸渗压力的关系以及密度与浸渗压力的关系

表1 浸渗压力与浸渗孔径的关系

图3 FLiNaK熔盐浸渗后材料的压缩强度和弯曲强度的变化

图4 2D C/C复合材料在浸渗前、在0.2 MPa FliNaK、0.4 MPa FliNaK和0.6 MPa FliNaK中浸渗后的二维切片和三维重构图像

图5 2D C/C复合材料在浸渗前和不同压力下浸渗后的断口形貌

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