Microstructure and mechanical behaviors of T700 carbon fiber reinforced C/SiC composites via precursor infiltration and pyrolysis

详细信息    查看全文

• 作者：Xin Ma^a ; ^b ; Si&rsquo ; an Chen^b ; Min Mei^c ; Yong Li^b ; Guangde Li^d ; Haifeng Hu^b ; ^{hfhu_nudt@nudt.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Xinbo He^a ; Xuanhui Qu^a
• 关键词：Tow-spreading technology ; C/SiC composites ; Interfaces ; Mechanical properties
• 刊名：Materials Science & Engineering A
• 出版年：2016
• 出版时间：1 June 2016
• 年：2016
• 卷：666
• 期：Complete
• 页码：238-244
• 全文大小：4261 K

文摘

A new tow-spreading technology was employed to spread T700SC 12 K fibers to a width of 12 mm, based on which plain weave carbon cloth with a low areal density of 100 g/m² and the thickness of 0.1 mm was obtained. 2D C/SiC composites reinforced by such T700 carbon cloth, together with T300 3 K plain weave carbon cloth (200 g/m² areal density) for comparison, were prepared by precursor infiltration and pyrolysis process. Chemical vapor deposition pyrocarbon (PyC) interphase was also used to modify the surface structures of both fiber reinforcements. The mechanical behaviors of the composites were predominantly affected by the in situ strength of carbon fibers as well as the relationship between the surface characteristics of carbon fibers and the material interface. T300 composites failed in a brittle mode, whereas T700 composites displayed a non-brittle fracture behavior. Mechanical properties of both composites were improved by PyC interphase. T700 composites with PyC interphase had a homogenous fiber-matrix structure and exhibited the optimum mechanical property, with the flexural strength, flexural modulus and shear strength of 425±23 MPa, 37±3 GPa and 24±2 MPa, respectively.