短炭纤维增强C和SiC双基体材料的力学性能及破坏机理  

Mechanical properties and fracture mechanism of short carbon fibre reinforced carbon and SiC dual matrix composites

作　　者：姜四洲[1] 李专[1] 熊翔[1] 肖鹏[1] 

机构地区：[1]中南大学粉末冶金国家重点实验,长沙410083

出　　处：《粉末冶金材料科学与工程》2010年第4期394-398,共5页Materials Science and Engineering of Powder Metallurgy

基　　金：湖南省科技重大专项基金资助项目(2009FJ1011-3);中南大学研究生学位论文创新基金资助(1960-71131100006)

摘　　要：以短炭纤维为增强纤维,以炭粉、Si粉和树脂为基体来源,采用温压—原位反应法制备C/C-SiC材料,研究该材料的力学性能及破坏机理。结果表明:C/C-SiC制动材料的纵向和横向抗弯强度分别为76 MPa和62 MPa,以韧性断裂为主,弯曲破坏表现为裂纹偏转、纤维桥接、纤维拔出和界面脱粘。纵向抗压强度达112 MPa,纵向压缩破坏表现为韧性断裂,以对角剪切破坏方式为主;横向抗压强度达84 MPa,横向压缩破坏主要表现为脆性断裂,以多层复合剪切破坏方式为主。材料的冲击韧性为3.1 kJ/m2。C/C-SiC braking composites were fabricated by warm compressed-in situ reacted process（WC-ISR） using short carbon fibers,graphite powder,Si powder and resin as raw materials.The mechanical properties and fracture mechanism of C/C-SiC braking composites were investigated.The values of lengthways and transverse flexural strength are 76 MPa and 62 MPa,respectively.The flexural fracture based mainly on toughness mechanism is deflection of crack,bridging of fibers,fiber pull-out and interfacial debonding.The value of lengthways compressive strength is 112 MPa,which destruction belongs to toughness fraction mechanism by shear stress and mostly destroys on the cross.The value of transverse compressive strength is 84 MPa,and the destruction belongs to brittleness fracture mechanism and destroys by multilayer complex shearing.The impact-toughness of C/C-SiC braking composites is 3.1 kJ/m2.

关 键 词：C/C-SIC 温压-原位反应法 力学性能 破坏机理 

分 类 号：TB331[一般工业技术—材料科学与工程] TH117.3[机械工程—机械设计及理论]