以不同酚醛树脂制备的C/C-SiC复合材料的力学性能  

Mechanical properties of C/C-SiC composites prepared with different phenolic resin

作　　者：秦明升[1] 肖鹏[1] 熊翔[1] 李专[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2008年第6期346-351,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：国家高新技术研究发展计划资助项目(2006AA03Z560)

摘　　要：选用热固性酚醛树脂A和热塑性酚醛树脂B分别与短炭纤维、石墨粉、硅粉、碳化硅按一定比例混合后,采用温压-原位反应法,制得具有不同树脂炭基体的C/C-SiC复合材料的试样1和2,并对其力学性能进行研究,以期优化该复合材料的成分配方和进一步提高其技术性能。结果显示:试样1在垂直于纤维层方向的压缩载荷及弯曲载荷作用下,未出现纤维拔出、脱粘等现象,界面结合较强,呈现脆性断裂,压缩强度σ⊥=60.7MPa,弯曲强度σb=34.5MPa;而在平行于纤维层的压缩载荷作用下,纤维与基体存在剪切作用,出现纤维脱粘,呈现韧性断裂,σ//=52.6MPa。试样2由于纤维的分散性不好,大量聚集在一起,在压缩和弯曲载荷作用下,均存在纤维的拔出和脱粘现象,界面结合较差,材料呈现韧性断裂,强度较低,σ⊥=45.8MPa,σ//=19.4MPa,σb=16.1MPa。The thermoset phenolic resin A and thermoplastic phenolic resin B were used to mix with short carbon fibre, graphite, silicon and carborundum in suitable proportion respectively, then samples 1 and 2 of C/C-SiC composite were prepared by warm moulding and in-situ reaction process; and the mechanical properties of the two C/C-SiC composite samples with different matrixes were researched for optimizing its composition coordinating and exploring further C/C-SiC braking material with high performance. The research shows that the fiber in sample 1 has no pull out and disadhesive phenomena under vertical compression stress and bending stress, the interface intensity is stronger between fibres and matrix, whose destruction belongs to brittleness fracture, compressive strength σ⊥=60.7 MPa, σb= 34.5 MPa. But sample 1 has the disadhesive phenomenon of fibres because of the shearing stress under the parallel compression stress, whose destruction belongs to toughness fracture, σ∥=52.6 MPa. Sample 2 exists the phenomena of pull out and disadhesion of fibres, because the fibres are bad in dispersion, and get together in mass as well as the interface intensity is worse between fibres and matrix, whose destruction belongs to toughness fracture and whose intensity is so low as σ⊥=45.8 MPa, σ∥=19.4 MPa, σb =16.1 MPa.

关 键 词：C/C-SIC 树脂炭 力学性能 界面强度 

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]