石墨纤维表面冷等离子体处理的研究

本文较为系统、全面地研究了各种气氛冷等离子体对石墨纤维(GrF)的表面处理。GrF经活性冷等离子体处理后,GrF和树脂基体间的粘结能力大为改善。不仅石墨纤维复合材料(GrFRP)的层间剪切强度(ILSS)提高250%以上,而且GrFRP的抗拉强度(S)和杨氏模量(M)也分别提高40%和10%。在GrFRP的ILSS与GrF被处理时间(t)之间存在着指数关系ILSS=A+CeB/t。我们认为:GrFRP的层间剪切破坏主要发生在GrF的外表面层中。活性冷等离子体处理通过改变GrF的表面层结构提高了GrF表面层的抗剪能力,使得GrFRP的ILSS得到大幅度提高。

THE SURFACE TREATMENT OF GRAPHITE FIBERS WITH COLD-PLASMA

The surface treatment of graphite fibers with Ar,N2,O2-plasma was studied.It was found,after the surfase of the graphite fibers was treated with O2-plasma,the intelaminar shear strength (ILSS) of Graphite Fiber Reinforcecl Plastics (GrFRP) was increased by over 250% and the tensile strength (S) and Young's modulus were increased by 40% and 10%,respectively.It was also found that the relationship between the time of the sutfase treatment of the graphite fiber and the ILSS of the GrFRP was surfase treatemnt of thr graphite fiber and the ILSS of the CrFRP wasILSS=A+Ce-B/t.We found that the shearing fracture of the GtFRP appeared in the surface layer of the graphite fiber.After the graphite fiber surface was treated by O2-plasma,the resistence of the surface layer to shearing stress was greatly raised by improving the layer structure,which made the ILSS of the GrFRP increased greatly.