Mechanical properties of 3D fiber reinforced C/SiC composites

Yongdong Xu, Laifei Cheng, Litong Zhang, Hongfeng Yin, Xiaowei Yin

科研成果: 期刊稿件文章同行评审

102 引用 (Scopus)

摘要

High toughness and reliable three dimensional textile carbon fiber reinforced silicon carbide composites were fabricated by chemical vapor infiltration. Mechanical properties of the composite materials were investigated under bending, shear, and impact loading. The density of the composites was 2.0-2.1 g cm-3 after the three dimensional carbon preform was infiltrated for 30 h. The values of flexural strength were 441 MPa at room temperature, 450 MPa at 1300°C, and 447 MPa at 1600°C. At elevated temperatures (1300 and 1600°C), the failure behavior of the composites became some brittle because of the strong interfacial bonding caused by the mis-match of thermal expansion coefficients between fiber and matrix. The shear strength was 30.5 MPa. The fracture toughness and work of fracture were as high as 20.3 MPa m1/2 and 12.0 kJ·m-2, respectively. The composites exhibited excellent uniformity of strength and the Weibull modulus, m, was 23.3. The value of dynamic fracture toughness was 62 kJ·m-2 measured by Charpy impact tests.

源语言英语
页(从-至)196-202
页数7
期刊Materials Science and Engineering: A
300
1-2
DOI
出版状态已出版 - 28 2月 2001

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