高韧性炭/炭复合材料的制备及研究

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (5): 1928-1936.

所属专题：陶瓷

高韧性炭/炭复合材料的制备及研究

张泽¹, 张明瑜¹, 方婉娴¹, 徐平¹, 曾晨¹, 高莹², 苏哲安¹, 黄启忠¹

1.中南大学轻质高强结构材料国家级重点实验室,长沙 410083;
2.北京中材人工晶体研究院有限公司,北京 100018

收稿日期:2024-01-14 修订日期:2024-03-18 出版日期:2024-05-15 发布日期:2024-06-06
通信作者: 张明瑜,博士,教授。E-mail:zhangmingyu@csu.edu.cn
作者简介:张泽(1998—),男,硕士研究生。主要从事热解炭、碳化硅化学气相沉积的研究。E-mail:920513885@qq.com
基金资助:
国家自然科学基金(U19A2088);长沙市重大项目(kh2103012)

Preparation and Research of High-Toughness C/C Composites

ZHANG Ze¹, ZHANG Mingyu¹, FANG Wanxian¹, XU Ping¹, ZENG Chen¹, GAO Ying², SU Zhean¹, HUANG Qizhong¹

1. National Key Laboratory of Science and Technology on High-Strength Structural Materials, Central South University, Changsha 410083, China;
2. Beijing Sinoma Synthetic Crystals Co., Ltd., Beijing 100018, China

Received:2024-01-14 Revised:2024-03-18 Online:2024-05-15 Published:2024-06-06

摘要/Abstract

摘要： C/C复合材料是一种高性能新型复合材料,但是脆性大、韧性差的缺点限制了其广泛应用。因此,本研究利用化学气相渗透(CVI)法,设计并制备了三种C/C复合材料,基体炭分别为粗糙层、光滑层以及粗糙层/各向同性层带状结构热解炭,研究了C/C复合材料的微观结构、沉积机理、断裂行为和增韧机制。结果表明,三种C/C复合材料的抗弯强度分别为189.1、191.5、233.5 MPa。粗糙层和带状结构炭基体的C/C复合材料为假塑性断裂,而光滑层炭基体的C/C复合材料则是明显的脆性断裂。与粗糙层炭基体的C/C复合材料相比,带状结构炭基体的C/C复合材料通过不同结构热解炭之间的界面滑动,使得应变量增加了约70%,韧性得到了提升。因此,通过控制CVI工艺参数,实现带状结构热解炭制备,可以有效优化C/C复合材料的韧性。

关键词: C/C复合材料, 化学气相渗透, 层间滑动, 断裂模式, 带状结构, 高韧性

Abstract: C/C composites are a new type of high-performance composites, but their shortcomings of high brittleness and poor toughness limit their wide application. Therefore, in this study, three kinds of C/C composites were designed and prepared using the chemical vapor infiltration (CVI) method with matrix carbon: rough layer, smooth layer, and rough layer/isotropic layer band-structured pyrolytic carbon(PyC), respectively. And the microstructures, fracture behaviors, and toughening mechanisms of C/C composites were investigated. The results indicate that the flexural strength of the three C/C composites is 189.1, 191.5, and 233.5 MPa, respectively. The C/C composites with rough layer and band-structured carbon matrix are pseudoplastic fractures. In contrast, the C/C composites with smooth layer carbon matrix are brittle fractures. Compared to the C/C composites with rough layer carbon matrix, the C/C composites with band-structured carbon matrix show a significant increase in toughness through interfacial sliding between the different structured pyrolytic carbon, which increases strain amount by about 70%. Therefore, the toughness of C/C composites can be effectively optimized by controlling the parameters of the CVI process to achieve band-structured pyrolytic carbon preparation.

Key words: C/C composite, chemical vapor infiltration, interlayer sliding, fracture mode, band-structure, high-toughness

中图分类号:

TB332

张泽, 张明瑜, 方婉娴, 徐平, 曾晨, 高莹, 苏哲安, 黄启忠. 高韧性炭/炭复合材料的制备及研究[J]. 硅酸盐通报, 2024, 43(5): 1928-1936.

ZHANG Ze, ZHANG Mingyu, FANG Wanxian, XU Ping, ZENG Chen, GAO Ying, SU Zhean, HUANG Qizhong. Preparation and Research of High-Toughness C/C Composites[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(5): 1928-1936.

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高韧性炭/炭复合材料的制备及研究

Preparation and Research of High-Toughness C/C Composites

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