Mechanical properties of short carbon fiber reinforced ZrB2-SiC ceramic matrix composites

作者：Yang Feiyu^*; Zhang Xinghong; Han Jiecai; Du Shanyi

来源：Materials Letters, 2008, 62(17-18): 2925-2927.

DOI：10.1016/j.matlet.2008.01.076

• zirconium diboride
• short carbon fiber
• microstructure
• mechanical properties

A ZrB2-20 vol.% SiC based ceramic matrix composite containing 20 vol.% short carbon fibers was top pressed at 2000 degrees C and 30 MPa for 1 h. The microstructure and mechanical properties of the composite were investigated. The fracture toughness was 6.56 MPa.m(1/2), which is 54% higher than that of ZrB2-20 vol.% SiC composite. The toughening mechanisms were fiber debonding, fiber pull-out and crack deflection. Moreover, it was found that a graphitization transition layer between fiber and matrix led to the decreased in flexural strength. The results presented here point to a potential way for improving the fracture toughness of ultra-high temperature ceramics.

• 出版日期2008-6-30
• 单位哈尔滨工业大学