【摘要】 冷等离子体（O₂）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。更多还原

【Abstract】 The surface of carbon liners prepared from polyacrylonrtmle (PAN) preeusor is continuously treated by means of cold plasma. The interlaminar shear strength of carbon fibers reinforced epoxy composite is increased from about 58.8MPa to about 98MPa. The results are caused by four aspects:(1) The reactivity is increased between fiber surface and matrix due to the incrementof amount of -COOH, and on fiber surface.2) The surface constituent is changed by plasma trertment to improve the wetting properties of fiber surface. The contact angle θbetween water and carbon fiber is decreased from 75° to 61°.(3) Electronic micrographs of the surface of earbon fiber show that the surface striation and surface roughness are changed fo increment after fiber surface etched by plasma. It increases adhesive interface and effect of mechanical interlocking.(4) The strength of carbon fiber is decreased very little(about 1.5%) by this treating method.The analysis of the fracture morphology by the use of scanning electron microscopy(SEM) indicates that dcbonding and fiber pulling-out between fiber and matrix don’t appear in the carbon (?) ubfirced composite. All of these results show that adhesion between fiber and matrix is very strong. In additon,the plasma treatment technology is very simple and the cost is very low. This treatment process does not produce any environmental pollution and has a more brilliant foreground for engineering applications.更多还原