Effect of heat treatment on the microstructure and tensile strength of KD-II SiC fibers

被引:81
作者
Cao, Shiyi [1 ]
Wang, Jun [1 ]
Wang, Hao [1 ]
机构
[1] Natl Univ Def Technol, Sci & Technol Adv Ceram Fibers & Composites Lab, Changsha 410073, Hunan, Peoples R China
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2016年 / 673卷
基金
中国国家自然科学基金;
关键词
A; Microstructure; A. Tensile strength; B. SiC fiber; C; Heat-treatment; D. Grain growth; SILICON-CARBIDE FIBER; HI-NICALON; SIC/SIC COMPOSITES; CREEP RESISTANCE; ATMOSPHERES; STABILITY; MECHANISM; BEHAVIOR; CARBON;
D O I
10.1016/j.msea.2016.07.066
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
KD-II SiC fibers, a new type of SiC fibers, were heat treated at elevated temperatures for 1 h in an Ar atmosphere. The microstructure and mechanical properties of the fibers before and after annealing were investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Raman spectroscopy and tensile tests, et al. The results show that the as-received fibers consisted of beta-SiC nano-crystals, free carbon and a small amount of amorphous intergranular SiCxOy phase. With increasing heat treatment temperature, significant growth of beta-SiC grains, ordering of free carbon and decomposition of SiCxOy phase occurred and the fiber surfaces became coarser with development of new defects, such as pores and large SiC particles. It was also found that KD-II SiC fibers maintained high strength with heat treatment at temperatures up to 1500 degrees C, exceeding which a sharp strength degradation wa&observed. The strength degradation and microstructural evolution of the fibers due to heat treatment were correlated, and it can be concluded that the beta-SiC grains growth, residual tensile stresses as well as surface flaws were the dominating factors for the fiber strength degradation after exposure at high temperatures. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:55 / 62
页数:8
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