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冷等离子体(O_2)连续处理碳纤维表面,能使复合材料层间剪切强度从600公斤/厘米~2左右提高到1000公斤/厘米~2左右,所以能得到比较好的处理效果是由四方面因素促成的:其一表面的—COOH、—C—OH和>C=0等含氧基团量的增加,提高了与基体反应能力;其二表面组份变化,改善了表面的浸润性,使对水的接触角由75℃降为61℃;其三碳纤维表面经等离子体刻蚀之后,沟槽加深,粗糙度变大,扩大了粘结界面和机械联结效应;其四这种处理方法纤维本身强度损失较少。由材料破坏断口电镜分析表明,纤维与基体之间没有脱粘和拔出现象产生,证明纤维与基体间界面粘结是良好的。另外此种处理方法工艺简单,费用低,处理过程没有公害物产生,故工业应用前景较大。
Cold plasma (O_2) continuous treatment of carbon fiber surface, the shear strength of the composite layer can be increased from about 600 kg / cm ~ 2 to about 1000 kg / cm ~ 2, so get a better treatment effect is from four aspects Factors contributed to: one of the surface -COOH, -C-OH and> C = 0 and other oxygen-containing groups increased, and improve the reaction with the matrix; the second surface composition changes to improve the surface of the infiltration, So that the water contact angle from 75 ℃ to 61 ℃; the three carbon fiber surface by plasma etching, the groove deepens, the roughness becomes larger, expanding the bonding interface and the mechanical coupling effect; the fourth of this treatment Fiber strength loss less. Electron microscopy analysis of the fracture surface shows that there is no debonding and pulling-out phenomenon between the fiber and the matrix, which proves that the interface bonding between the fiber and the matrix is good. In addition, this treatment process is simple, low cost, there is no pollution generated during the treatment process, so the industrial application of the larger prospects.