先驱体浸渍裂解C/SiCN复合材料的拉伸行为与基体开裂机制

doi:10.15541/jim20200109

无机材料学报 ›› 2020, Vol. 35 ›› Issue (11): 1227-1233.DOI: 10.15541/jim20200109

所属专题：结构陶瓷论文精选(2020)

先驱体浸渍裂解C/SiCN复合材料的拉伸行为与基体开裂机制

李旭勤¹, 谭志勇², 成来飞³, 周灵柯¹, 高健¹

1. 成都工业学院材料与环境工程学院, 成都 611730;
2. 北京临近空间飞行器系统工程研究所, 北京 100076;
3. 西北工业大学超高温结构复合材料重点实验室, 西安 710072

收稿日期:2020-03-03 修回日期:2020-03-24 出版日期:2020-11-20 网络出版日期:2020-05-10
作者简介:李旭勤(1985-), 女, 讲师. E-mail: zslxq1130@qq.com.
基金资助:
国防科技重点实验室基金(6142911180101); 金属材料磨损控制与成型技术国家地方联合工程研究中心2019年开放基金(HKDNM2019021); 成都工业学院校博士基金(2019RC005); 国家科技重大专项(2017-VI-0007-0077); National Defense Science and Technology Key Laboratory Fund Project (6142911180101); Metal and Materials Wear Control and Forming Technology National and Local Joint Engineering Research Center 2019 Open Fund Project (HKDNM2019021); Chengdu Technological University PhD Fund (2019RC005); National Science and Technology Major Project (2017-VI-0007-0077)

Tensile Behaviors and Matrix Cracking Mechanism of C/SiCN Composite Prepared by Precursor Infiltration Pyrolysis Method

LI Xuqin¹, TAN Zhiyong², CHENG Laifei³, ZHOU Lingke¹, GAO Jian¹

1. School of Materials and Environmental Engineering, Chengdu Technological University, Chengdu 611730, China;
2. Beijing Institute of Nearspace Vehicle's Systems Engineering, Beijing 100076, China;
3. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xian 710072, China

Received:2020-03-03 Revised:2020-03-24 Published:2020-11-20 Online:2020-05-10
About author:LI Xuqin(1985-), female, lecturer. E-mail: zslxq1130@qq.com

摘要/Abstract

摘要： 采用先驱体浸渍裂解法制备陶瓷基复合材料过程中会形成基体裂纹和孔隙, 基体开裂和裂纹演化机制是工艺设计和性能优化的依据。本研究采用真空旋转浸渍-裂解法制备了无界面相的纤维束C/SiCN复合材料, 分析了该材料的拉伸性能和基体裂纹增殖现象, 讨论了浸渍裂解次数和热处理温度对基体裂纹的影响规律。研究结果表明: 当热处理温度为1000~1400 ℃时, 该复合材料的化学组成变化较小; 热处理温度达到1600 ℃时, 先驱体转化的SiCN基体分解, C含量降低, SiC含量升高。随浸渍裂解次数由1次增加到4次, 该复合材料的平均拉伸强度分别提升14.19%、38.83%和63.47%, 同时基体裂纹间距和裂纹开口距离均逐渐减小, 基体纤维结合增强, 断口纤维拔出减少。热处理温度从1000 ℃升高到1400 ℃, C/SiCN拉伸强度缓慢增大; 热处理温度为1600 ℃时, SiCN基体由无定形的SiC_xN_4-_x四面体向SiC晶体转变, 基体与纤维脱粘, 二者结合强度降低, 同时基体体积收缩使C纤维损伤, 导致该复合材料拉伸强度陡然下降30.0%。

关键词: C/SiCN复合材料, 先驱体浸渍裂解工艺, 强度, 开裂, 失效机制

Abstract: Significant matrix cracks and residual pores may form within ceramic matrix composite which was prepared by polymer infiltration and pyrolysis (PIP) method. Explore the matrix cracking mechanism and the crack evolution behavior would benefit the design and performance optimization of the composite. A spinning PIP process in vacuum was adopted to prepare mini C/SiCN composite without weak interphase. The tensile properties and the matrix crack evolution phenomena were analyzed. The influences of PIP cycles and heat-treatment temperatures were discussed. Results showed that the compositions are essentially the same for the samples heat-treated at 1000-1400 ℃. While the heat-treatment temperature rises to 1600 ℃, the precursor-derived SiCN matrix decomposes, with the carbon content decreased and SiC content increased significantly. As PIP cycles increased from 1 to 4, the average tensile strength of the composite increased by 14.19%, 38.83%, and 63.47%, respectively. The matrix crack spacing and crack opening distance gradually decreased, and the bonding between matrix and fiber was enhanced, leading to little fiber pull-out. When the heat-treatment temperature increased from 1000 ℃ to 1400 ℃, the tensile strength of the composite changed slightly. In contrast, when heat-treatment temperature roses to 1600 ℃, the SiCN matrix was transformed from amorphous SiC_xN_4-_x tetrahedron structural units to SiC crystals. Then the matrix and the fiber debonded, resulting in their bonding strength weakened. As a result, the tensile strength of the C/SiCN composite decreased by 30.0%, due to a combined effect of interfacial debonding and fiber damage.

Key words: C/SiCN composite, precursor infiltration pyrolysis, strength, cracking, failure mechanism

中图分类号:

TB332

李旭勤, 谭志勇, 成来飞, 周灵柯, 高健. 先驱体浸渍裂解C/SiCN复合材料的拉伸行为与基体开裂机制[J]. 无机材料学报, 2020, 35(11): 1227-1233.

LI Xuqin, TAN Zhiyong, CHENG Laifei, ZHOU Lingke, GAO Jian. Tensile Behaviors and Matrix Cracking Mechanism of C/SiCN Composite Prepared by Precursor Infiltration Pyrolysis Method[J]. Journal of Inorganic Materials, 2020, 35(11): 1227-1233.

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先驱体浸渍裂解C/SiCN复合材料的拉伸行为与基体开裂机制

Tensile Behaviors and Matrix Cracking Mechanism of C/SiCN Composite Prepared by Precursor Infiltration Pyrolysis Method

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