热震对Si-SiC涂层C/C复合材料力学行为的影响Influence of thermal shock on the mechanical behavior of Si-SiC coated carbon/carbon composites

J. Mater. Sci. Technol. ›› 2009, Vol. 25 ›› Issue (02): 251-253.

热震对Si-SiC涂层C/C复合材料力学行为的影响Influence of thermal shock on the mechanical behavior of Si-SiC coated carbon/carbon composites

Qiangang Fu; Hejun Li^†; Yongjie Wang; Kezhi Li and Lu Wei

收稿日期:2008-06-20 修回日期:2008-09-01 出版日期:2009-03-28 发布日期:2009-10-10
通讯作者: 李贺军
基金资助:
国家自然科学基金;国家自然科学基金;国家自然科学基金;国家自然科学基金;国家自然科学基金;国家自然科学基金;国家自然科学基金;国家自然科学基金

Influence of Thermal Shock on the Mechanical Behavior of Si-SiC Coated Carbon/Carbon Composites

Qiangang Fu, Hejun Li^†, Yongjie Wang, Kezhi Li and Lu Wei

C/C Composites Research Center, Northwestern Polytechnical University, Xi0an 710072, China

Received:2008-06-20 Revised:2008-09-01 Online:2009-03-28 Published:2009-10-10
Contact: Hejun Li
Supported by:
the National Natural Science Foundation of China under grant Nos. 50802075 and 90716024,
the “111” Project, China under grant No. 08040

摘要/Abstract

摘要：

采用两步包埋法在C/C复合材料表面制备了Si-SiC涂层，研究了空气环境下1773K↔室温热震对涂层C/C复合材料力学性能和断裂行为的影响。结果表明，1773K↔室温热震5，10和15次后，涂层C/C复合材料的弯曲强度分别增加4.29%, 15.00% and 24.20%；热震过程中涂层C/C韧性逐渐增加；纤维和基体间界面结合弱化以及残余热应力的消除是热震后涂层C/C复合材料力学性能提高的主要原因。

关键词: 碳/碳复合材料;涂层;力学行为

Abstract:

Si-SiC coating was prepared on the surface of carbon/carbon (C/C) composites by a two-step technique of pack cementation, and the influences of thermal shock between 1773 K and room temperature in air on the mechanical property and fracture behavior of the coated C/C were studied. The results show that, after thermal shock between 1773 K and room temperature for 5, 10 and 15 times, the flexural strength of coated composites increases by 4.29%, 15.00% and 24.20%, respectively. The toughness of the coated C/C enhances gradually during the thermal shock test. The improvement of the mechanical property after the thermal shock test is primarily caused by the weakening of the fiber-matrix interface and the reduction of residual thermal stresses by thermal shock.

Key words: Carbon/carbon composites, Coating, Mechanical behavior

fu 李贺军王永杰李克智魏璐. 热震对Si-SiC涂层C/C复合材料力学行为的影响Influence of thermal shock on the mechanical behavior of Si-SiC coated carbon/carbon composites[J]. J. Mater. Sci. Technol., 2009, 25(02): 251-253.

Qiangang Fu,Hejun Li,Yongjie Wang,Kezhi Li,Lu Wei. Influence of Thermal Shock on the Mechanical Behavior of Si-SiC Coated Carbon/Carbon Composites[J]. J Mater Sci Technol, 2009, 25(02): 251-253.

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