Surface Oxidation of Carbon Fiber and Its Influence on the Properties of Carbon Fiber Reinforced BN-Si3N4 Composites
Toray T300 PAN-based carbon fibers were surface oxidized in air at 300,400 and 500 ℃.The composition of surface was determined by X-ray photoelectron spectrometry (XPS),and the monofilaments of original carbon fiber and surface oxidized carbon fibers were tensile tested at room temperature.Three-dimensional carbon fiber reinforced BN-Si3N4 matrix composites were prepared by precursor infiltration and pyrolysis using a hybrid precursor mixed by borazine and perhydropolysilazane.With the increase of the oxidation temperature,the content of size on the surface of fiber reduces,and the tensile strength of carbon fiber declines.Carbon fiber oxidized at 400 ℃ has a 93% residual strength and the fiber oxidized at 500 ℃ is seriously decayed.The composite reinforced by original carbon fibers exhibits excellent mechanical properties,including high flexural strength (182.3 MPa) and good toughness; while the composite reinforced by 400 ℃ oxidized carbon fibers is weak (only 102.4 MPa) and brittle.The distinct difference of mechanical properties between the two composite is attributed to the change of the interfaces between carbon fibers and nitride matrices.
Carbon fiber Surface oxidation Mechanical properties Composite
Bin Li Chang-Rui Zhang Feng Cao Si-Qing Wang Ying-Bin Cao Bang Chen
State Key Laboratory of Advanced Ceramic Fibers & Composites,College of Aerospace & Materials Engineering,National University of Defense Technology,Changsha 410073,PR China
国际会议
The Fifth China International Conference on High-Performance Ceramics (第五届先进陶瓷国际研讨会(CICC-5))
长沙
英文
901-904
2007-05-10（万方平台首次上网日期，不代表论文的发表时间）