热处理对W芯SiC纤维结构和力学性能的影响

doi:10.13251/j.issn.0254-6051.2022.05.002

金属热处理 ›› 2022, Vol. 47 ›› Issue (5): 7-13.DOI: 10.13251/j.issn.0254-6051.2022.05.002

热处理对W芯SiC纤维结构和力学性能的影响

刘帅, 罗贤, 黄斌, 杨延清

西北工业大学材料学院, 陕西西安 710072

收稿日期:2022-02-12 修回日期:2022-04-12 出版日期:2022-05-25 发布日期:2022-06-16
通讯作者: 罗贤,副教授,博士,E-mail: luoxian@nwpu.edu.cn
作者简介:刘帅(1986—),男,博士研究生,主要研究方向为金属基复合材料,E-mail: sliu_univ@163.com。
基金资助:
陕西省自然科学基金(2021JM-061)

Influence of heat treatment on microstructure and mechanical properties of W-core SiC filaments

Liu Shuai, Luo Xian, Huang Bin, Yang Yanqing

School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an Shaanxi 710072, China

Received:2022-02-12 Revised:2022-04-12 Online:2022-05-25 Published:2022-06-16

摘要/Abstract

摘要： 通过扫描电镜、能谱仪、X射线衍射仪、拉曼光谱分析和拉伸试验等手段研究了W芯SiC纤维在低真空环境中不同热处理温度下各组成部分的组织结构和纤维力学性能的变化规律。结果表明,在相同热处理制度下,W芯比W芯SiC纤维具有更高的抗拉强度。W/SiC界面反应层和SiC沉积层在800 ℃×50 h热处理后均表现出良好的结构稳定性,这使W芯SiC纤维的抗拉强度可以保持在3.10 GPa。热处理温度进一步升高使W/SiC界面反应层厚度和界面孔洞尺寸显著增加,同时晶粒长大和表面凹坑缺陷的形成破坏了SiC沉积层的结构稳定性。在这些因素的共同作用下,W芯SiC纤维的Weibull模数经900 ℃×50 h热处理后下降至9.7,抗拉强度经1000 ℃×50 h热处理后下降至1.12 GPa。

关键词: W芯SiC纤维, 热处理, 显微结构, 力学性能

Abstract: Scanning electron microscope (SEM), energy dispersive spectrometer (EDS), X-ray diffraction (XRD), Raman spectrometer analysis and tensile test were employed to study the microstructure of the components in W-core SiC filaments and its mechanical properties after different heat treatments in a low vacuum environment. The results show that the tensile strength of the W-core is much higher than that of the W-core SiC filaments after experiencing the same heat treatment. The structural stability of the W/SiC interfacial reaction layer and the SiC deposit can be well retained after heating at 800 ℃ for 50 h, which enables the tensile strength of the W-core SiC filaments to reach 3.10 GPa. Further increasing the temperature during the heat treatment not only promotes the growth of the W/SiC interfacial reaction layer as well as the interfacial voids, but also severely damages structural stability of the SiC deposit through the coarsening of the interior columnar grains and the formation of grooves on the surface, which leads to the Weibull modulus of W-core SiC filaments after heating at 900 ℃ for 50 h and the tensile strength after heating at 1000 ℃ for 50 h decrease to 9.7 and 1.12 GPa, respectively.

Key words: W-core SiC filaments, heat treatment, microstructure, mechanical properties

中图分类号:

TB333

刘帅, 罗贤, 黄斌, 杨延清. 热处理对W芯SiC纤维结构和力学性能的影响[J]. 金属热处理, 2022, 47(5): 7-13.

Liu Shuai, Luo Xian, Huang Bin, Yang Yanqing. Influence of heat treatment on microstructure and mechanical properties of W-core SiC filaments[J]. Heat Treatment of Metals, 2022, 47(5): 7-13.

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热处理对W芯SiC纤维结构和力学性能的影响

Influence of heat treatment on microstructure and mechanical properties of W-core SiC filaments

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