2D SiC/SiC复合材料电阻率对服役环境的响应特性

doi:10.15541/jim20210138

无机材料学报 ›› 2022, Vol. 37 ›› Issue (4): 420-426.DOI: 10.15541/jim20210138

所属专题：【结构材料】陶瓷基复合材料

2D SiC/SiC复合材料电阻率对服役环境的响应特性

魏婷婷¹(), 高希光²(), 宋迎东²^,³

1.航空工业金城南京机电液压工程研究中心, 南京 211106
2.南京航空航天大学能源与动力学院, 江苏省航空动力系统重点实验室, 南京 210016
3.南京航空航天大学能源与动力学院, 机械结构力学及控制国家重点实验室, 南京 210016

收稿日期:2021-03-09 修回日期:2021-05-20 出版日期:2022-04-20 网络出版日期:2021-05-25
通讯作者: 高希光, 教授. E-mail: gaoxiguang@nuaa.edu.cn
作者简介:魏婷婷(1994-), 女, 硕士. E-mail: weitingtingd@163.com
基金资助:
国家重点研发计划(2017YFB0703200);国家自然科学基金(51575261);国家自然科学基金(51675266);江苏高校优势学科建设工程资助项目

Response of 2D SiC/SiC Composites Resistivity to Service Environments

WEI Tingting¹(), GAO Xiguang²(), SONG Yingdong²^,³

1. AVIC Jincheng Nanjing Engineering Institute of Aircraft System, Nanjing 211106, China
2. Jiangsu Province Key Laboratory of Aerospace Power System, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
3. State Key Laboratory of Mechanics and Control Mechanical Structures, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Received:2021-03-09 Revised:2021-05-20 Published:2022-04-20 Online:2021-05-25
Contact: GAO Xiguang, professor. E-mail: gaoxiguang@nuaa.edu.cn
About author:WEI Tingting (1994-), female, Master. E-mail: weitingtingd@163.com
Supported by:
National Key Research and Development Program of China(2017YFB0703200);National Natural Science Foundation of China(51575261);National Natural Science Foundation of China(51675266);Priority Academic Program Development of Jiangsu Higher Education Institutions

摘要/Abstract

摘要：

研究针对不同服役环境下2D SiC/SiC复合材料的电阻率特性进行了研究。从1300 ℃降至室温的无氧环境中, 复合材料的电阻率随温度降低而增大; 借助曲线拟合, 建立了电阻率与温度之间的映射关系。在1300 ℃空气环境中氧化20和60 h后, 由于PyC界面层和SiC基体的氧化, 复合材料的导电性显著降低; 以SiO₂的含量定量表征氧化程度, 建立了电阻率与氧化损伤之间的映射关系。复合材料的电阻率和应力随应变的变化趋势相似, 电阻率变化率和刚度随应变的变化趋势相反。在线性阶段, 基体开裂数量极少, 刚度几乎不变, 电阻率缓慢增大; 在非线性阶段, 基体开裂数量增加较快, 造成刚度降低, 电阻率快速增大; 后半段的基体裂纹数量缓慢增多, 刚度和电阻率变化率趋于平稳。

关键词: 陶瓷基复合材料, 电学特性, 高温特性, 机械性能, 损伤力学

Abstract:

The resistivity characteristics of 2D SiC/SiC composites were studied experimentally. In the oxygen-free environment, the resistivity increases when temperature decreases. With curve fitting, the mapping relationship between resistivity and temperature is established. After oxidation at 1300 ℃ in the air for 20 and 60 h, the conductivity of composites is greatly reduced due to the oxidation of the PyC interface and the SiC matrix. The degree of oxidation was characterized by the content of SiO₂, and the quantitative relationship between resistivity and oxidative damage was obtained. The changes in resistivity and stress with strain are similar. In the linear segment of stress-strain curve, with few matrix cracks the stiffness is almost unchanged, and the resistivity increases slowly. In the non-linear section, the resistivity rate and stiffness increase quickly because crack increases rapidly. They eventually stabilize when the increase in cracks slows down.

Key words: ceramic-matrix composites, electrical property, high-temperature property, mechanical property, damage mechanics

中图分类号:

TB332

魏婷婷, 高希光, 宋迎东. 2D SiC/SiC复合材料电阻率对服役环境的响应特性[J]. 无机材料学报, 2022, 37(4): 420-426.

WEI Tingting, GAO Xiguang, SONG Yingdong. Response of 2D SiC/SiC Composites Resistivity to Service Environments[J]. Journal of Inorganic Materials, 2022, 37(4): 420-426.

图/表 13

图1 2D SiC/SiC复合材料试验件的微观结构

Fig. 1 Microstructures of 2D SiC/SiC composites specimen (a) Surfaces; (b) Side face; (c) Cross section

图2 2D SiC/SiC复合材料的SEM照片(a)和EDS元素占比分析结果(b); C元素(c)、O元素(d)及Si元素(e)的面扫描图

Fig. 2 SEM image (a) and EDS analysis (b) of the 2D SiC/SiC composites with surface scans of C (c), O (d) and Si (e)

表1 2D SiC/SiC复合材料样品

Table 1 Details of the 2D SiC/SiC composites specimens

Number	Temperature/℃	Holding time/h	Dimension/mm
T1	1300	-	120×8
T2	1300	20	60×8
T3	1300	60	60×8
T4	-	-	120×12

图3 高温惰性气体环境箱示意图

Fig. 3 Diagram of the high-temperature system under inert gas environment

图4 2D SiC/SiC复合材料样品的单向拉伸试验装置

Fig. 4 Equipment of uniaxial tensile experiment of 2D SiC/SiC composites specimen

图5 2D SiC/SiC复合材料单向拉伸样品

Fig. 5 2D SiC/SiC composites specimen

图6 2D SiC/SiC复合材料电阻率与温度的关系曲线

Fig. 6 Resistivity-temperature response of the 2D SiC/SiC composites

图7 氧化后2D SiC/SiC复合材料表面和侧面的微观形貌

Fig. 7 Microstructures of the 2D SiC/SiC composites specimen after oxidation (a) Surface; (b) Side face

图8 氧化后2D SiC/SiC复合材料横截面的SEM照片和EDS元素面分析结果

Fig. 8 SEM image and EDS analysis of the cross-section of the 2D SiC/SiC composites specimen after oxidation

图9 2D SiC/SiC复合材料电阻率与SiO2含量的关系曲线

Fig. 9 Relationship between resistivity and SiO2 content of the 2D SiC/SiC composites

图10 2D SiC/SiC复合材料电阻率与应力-应变的关系曲线

Fig. 10 Response of resistivity and stress to strain of the 2D SiC/SiC composites

图11 2D SiC/SiC复合材料的电阻率变化率和刚度与应变的关系曲线

Fig. 11 Response of resistivity-rate and stiffness to strain of the 2D SiC/SiC composites

图12 2D SiC/SiC复合材料的断口形貌

Fig. 12 Fracture micromorphologies of the 2D SiC/SiC composites specimen

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2D SiC/SiC复合材料电阻率对服役环境的响应特性

Response of 2D SiC/SiC Composites Resistivity to Service Environments

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