Effect of pyrolysis temperature on structure and properties of 2D-Cf/SiC composites fabricated by precursor pyrolysis

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作者：
Key Laboratory of Advanced Ceramic Fibers and Composites, National University of Defense Technology, Changsha 410073, China [1 ]
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来源：
Hangkong Cailiao Xuebao | 2006年 / 5卷 / 61-64期
关键词：
Bending strength - Carbon fibers - Fracture toughness - Infiltration - Interfaces (materials) - Mechanical properties - Microstructure - Pyrolysis - Shear strength - Silicon carbide - Two dimensional;
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摘要：
Two-dimensional carbon fiber cloth reinforced silicon carbide (2D-Cf/SiC) composites were fabricated with polycarbosilane (PCS) and divinylbenzene (DVB) as precursors and SiC as inert fillers. The effects of the pyrolysis temperature in the first cycle on the microstructure and mechanical properties of Cf/SiC composites were investigated. The results showed that increasing the first pyrolysis temperature could decrease the interfacial bonding force between carbon fiber and SiC matrix. As a result, the composites fabricated with higher pyrolysis temperature exhibit better mechanical properties. When the pyrolysis temperature of the first cycle raised from 1000°C to 1600°C, the flexural strength, shear strength and fracture toughness enhanced from 200.7 MPa, 16.8 MPa and 7.4 MPa &middotm1/2 to 200.7 MPa, 16.8 MPa and 7.4 MPa&middotm1/2, respectively.
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