氩气气氛热处理对 Shicolon-II SiC 纤维机械性能和微观结构演变的影响

doi:10.15541/jim20250052

摘要/Abstract

摘要： 碳化硅纤维因其优异的力学性能和高温特性, 成为陶瓷基复合材料的理想增强材料。由于不同型号纤维在组分和制备工艺上的差异,有必要进行单独研究。本研究系统探讨了Shicolon-II纤维在1300 ~ 1700 °C氩气热处理条件下力学性能、表面微观结构和成分的演变规律。Shicolon-II纤维由小尺寸的β-SiC晶粒、SiC_xO_y非晶相及少量石墨微晶组成。在1300 °C氩气气氛处理后,纤维的单丝拉伸强度保持在3.62 GPa（保留率为98.32%）,而在1500 °C氩气气氛处理后,强度下降至2.87 GPa（保留率为78.08%）。纤维力学性能的下降可归因于非晶相的分解和β-SiC晶粒的生长。抗蠕变性能是复合材料长期性能的关键因素。在1400 °C以上温度处理,由于β-SiC晶粒的生长,纤维的高温抗蠕变性能显著增强。这项研究为第二代纤维的高温应用提供了有价值的理论依据。

关键词: Shicolon-II SiC纤维, 热处理, 力学性能, 微观结构

Abstract: Silicon carbide fibers are considered ideal reinforcing materials for ceramic matrix composites due to their excellent mechanical properties and high-temperature performance. Different types of fibers necessitate individual investigation due to variations in their composition and fabrication processes. This study presents a comprehensive investigation into the evolution of the mechanical properties, surface microstructure, and composition of Shicolon-II fibers subjected to argon heat treatment at temperatures ranging from 1300 °C to 1700 °C. The Shicolon-II fibers are composed of small-sized β-SiC grains, SiC_xO_y amorphous phase, and a minor amount of graphite microcrystals. Following treatment in an argon atmosphere at 1300 °C, the fibers maintain a monofilament tensile strength of 3.62 GPa, corresponding to a retention of 98.32% retention. This strength diminishes to 2.87 GPa, equating to a retention of 78.08%, after treatment at 1500 °C. The reduction in the mechanical properties of the fibers can be ascribed to the decomposition of the amorphous phase and the growth of β-SiC grains. Furthermore, creep resistance is an essentialfactor influencing the long-term performance of composite materials. After treatment at temperatures above 1400 °C, the high-temperature creep resistance of the fibers is significantly enhanced due to the growth of β-SiC grains. This study offers valuable theoretical insights into the high-temperature applications of second-generation fibers, contributing to an enhanced understanding of their performance under extreme conditions.

Key words: Shicolon-II SiC fibers, heat treatment, mechanical properties, microstructure

中图分类号:

TQ343

袁旺, 胡建宝, 周亮, 阚艳梅, 张翔宇, 董绍明. 氩气气氛热处理对 Shicolon-II SiC 纤维机械性能和微观结构演变的影响[J]. 无机材料学报, DOI: 10.15541/jim20250052.

YUAN Wang, HU Jianbao, Zhou Liang, KAN Yanmei, ZHANG Xiangyu, DONG Shaoming. Effect of Argon Atmosphere Heat Treatment on Mechanical Properties and Microstructural Evolution of Shicolon-II SiC Fibers[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20250052.

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