C_f/Cu/C复合材料的抗弯性能

Flexural property of C_f/Cu/C composites

分别以无纬布/网胎/铜网(A型)和网胎/铜网型(B型)预制体为增强体,采用化学气相渗透和树脂浸渍-炭化法增密制备以热解炭/树脂炭为基体的3种炭纤维混杂铜网增强炭基体(C_f/Cu/C)复合材料,热解炭在热解炭/树脂炭基体中的体积分数分别为38%(M1)、29%(M2)、19%(M3)。选用Instron3369型材料试验机测试材料的抗弯强度。研究预制体类型和热解炭含量对复合材料力学性能的影响。结果表明,预制体类型和热解炭含量是影响复合材料抗弯强度的重要因素。在垂直和平行方向上,A型预制体及B型预制体试样的抗弯强度都随热解炭含量的降低而降低。且对同一试样,垂直方向的抗弯强度均优于平行方向上的抗弯强度,但差异较小;A型C_f/Cu/C复合材料较B型C_f/Cu/C复合材料有更高的抗弯强度。弯曲断裂时,炭纤维从热解炭和树脂炭层中拔出,断口呈台阶状。

Using non-woven fabric/fibre web/copper mesh(A-type)and fibre web/copper mesh(B-type)as reinforcements,three kinds of Cf/Cu/C composites were prepared by chemical vapor infiltration and impregnation-carbonization with resin carbon method.The percentage of pyrolytic carbon were 38%(M1),29%(M2),19%(M3)in the matrix.Respectively the flexural property of the composite was measured on Instron-3369 mechanical testing machine.The effects of type of preform and pyrolytic carbon content on mechanical property were investigated.The results show that with the decrease of pyrolytic carbon content,the flexural strength of A-type and B-type composites decreases gradually in vertical and parallel direction.For the same specimen,the flexural strength of Cf/Cu/C composites in the vertical direction is better than that of parallel direction,but the difference is small.Compared with B-type Cf/Cu/C composites,A-type Cf/Cu/C composites have better mechanical property.When the bending is carried out,carbon fibers from pyrolytic carbon and resin carbon layers are pulled out,and fracture morphology is step-like.