Surface structures of PAN-based carbon fibers and their influences on the interface formation and mechanical properties of carbon-carbon composites

详细信息    查看全文

• 作者：Shuai Wu ; Yunqi Liu ; Yicheng Ge ; Liping Ran ; Ke Peng ; Maozhong Yi ; ^{yimaozhong@126.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：A. Carbon fibers ; A. Carbon-carbon composites (CCCs) ; B. Interface/interphase ; B. Mechanical properties
• 刊名：Composites Part A: Applied Science and Manufacturing
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：90
• 期：Complete
• 页码：480-488
• 全文大小：4144 K

文摘

Defects and microvoids in the surface region not only influenced the tensile strength and strain of carbon fibers but also affected the interface formation with pyrocarbon. The interface formation in carbon-carbon composites was closely correlated to rearrangement of carbon atoms and the evolution of surface structure of carbon fiber. Half-open elliptic microvoids or edge planes at the fiber surface were beneficial to the mechanical interlocking as well as chemical bonding with pyrocarbon, contributing to a compatible interface with high interlaminar shear strength of the composites. The closed microvoids in the surface region of carbon fiber would hardly open up to bond with pyrocarbon, which brought negative effects to the mechanical properties of composites. Carbon fiber without obvious microvoids or surface defects tended to have better tensile strain but form weak interface with pyrocarbon, leading to a better pseudo-ductility and ability to absorb more fracture energy under load.