Random chopped fibers in reaction bonded SiC composite: Morphology, etching and reinforcing properties

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• 作者：Shuang Li ; ^{shuangli1981@gmail.com} ; Yumin Zhang ; Jiecai Han ; Yufeng Zhou
• 关键词：Electron microscopy ; Mechanical characterization ; Ceramics ; Casting ; Sintering
• 刊名：Materials Science and Engineering ; A
• 出版年：2012
• 期刊代码：61_09215093
• 类别：ms
• 出版时间：15 August, 2012
• 卷：551
• 期：Complete
• 页码：104-109
• 文件大小：1346 K

摘要

Random chopped fibers were introduced into SiC/C slurry to improve the mechanical behaviors of reaction bonded SiC ceramics. The distribution, morphology and chemical properties of the siliconized carbon fiber were investigated. The effect of fiber fraction on mechanical behaviors of the reaction bonded silicon carbide composite was studied. The siliconization reaction led to a dense layer of nano and micron SiC particles on the fiber surface. Based on the morphology changes in the acid etching test, a structural model of the siliconized fiber was proposed. The fracture toughness and the flexural strength of the composite were improved by the random chopped fiber, reaching the peak values of 5.1 MPa m^0.5 and 416 MPa, respectively, at the fiber fraction of 30 vol.%.