2.5维碳纤维机织酚醛树脂基摩擦材料的力学性能

Mechanical Properties of 2.5D Woven Carbon Fabric Phenolic Resin Matrix Friction Materials

以碳纤维为原料,设计织造碳纤维体积含量约50%的浅交弯联和深交联两种典型的2.5维(2.5D)机织物,优选基体材料组分和配方,采用溶液浸渍、真空辅助相结合的成型工艺,制备出新型2.5D碳纤维机织物酚醛树脂基摩擦材料。测试了预制体的密度、摩擦材料的孔隙率和密度;研究了摩擦材料弯曲、剪切性能,并分析其细观形态及破坏机理。结果表明:浅交弯联碳布密度为0.79g/cm3,深交联碳布密度为0.84g/cm3;对应的复合材料密度分别为1.44和1.37g/cm3。相同碳纤维体积含量的深交联摩擦材料的孔隙率略大于浅交弯联。在纤维体积含量相同的情况下,相较于浅交弯联摩擦材料,深交联结构具有较大的剪切强度和抗弯强度;而在弯曲载荷作用下,浅交弯联摩擦材料表现为缓慢破坏,具有较好的稳定性。

Two kinds of 2.5Dwoven fabrics(curved shallow crossing linking and deep crossing linking)were designed and weaved using carbon fibers with 50% volume content.2.5Dwoven carbon fabric reinforced phenolic resin friction materials as friction materials were prepared by solution dipping and vacuum assisted process after composition and formula optimizations.The density of the fabric preforms and the porosity and density of the friction materials were tested.For the friction materials the bending and shearing behaviors and their failure mechanism were comprehensively analyzed.The results show that the densities of the curved shallow-crossing linking and the deep crossing linking carbon fabric are 0.79 and 0.84g/cm3,and the densities of corresponding friction materials are 1.44 and 1.37g/cm3,respectively.The porosity of curved shallow crossing linking friction materials is lower than that of deep crossing linking ones in the case of the same fiber volume fraction.In addition,the deep crossing linking friction materials have higher shear strength and better flexural properties,but faster decaying and less stable,than curved linking friction materials.