摘要:
对比研究(NH4)2HPO4和NH4H2PO4两种不同电解质对碳纤维电化学改性效果的影响。通过拉丁方试验,研究了各改性参数对纤维表面改性效果的影响程度,采用XPS、AFM、BET技术对纤维表面化学组成、形貌及其比表面积的变化进行了表征分析。结果表明:以(NH4)2HPO4为电解质处理时改性效果主要受相对电流密度的影响,而以NH4H2PO4为电解质时电解液浓度是最主要的影响因素;在(NH4)2HPO4电解液中,纤维表面氧化刻蚀温和,改性效果显著,层间剪切强度可提高到79.8MPa,而在NH4H2PO4电解液中,纤维表面受到较强烈氧化刻蚀,本体强度损失较大,复合材料层间剪切强度仅能提高到70.8MPa。
Abstract:
The effects of electrochemical treatment of carbon fibers in different aqueous phosphate were investigated. The Latin square experiment was used to optimize the treatment parameters. The chemical components, morphology and specific area of fibers surface were characterized by using XPS, AFM and BET technique.The results indicate that the specific current density and the electrolyte concentration are the significant factors in fiber surface treatment in (NH4)2HPO4 and NH4H2PO4 solutions, respectively. The effect of modification is very outstanding in (NH4)2HPO4 solution because the oxidation and corrosion are moderate, and the ILSS of its composite is increased to 79.8 MPa. Whereas the effect of modification is difficult to control in NH4H2PO4 solution due to the drastic oxidation and corrosion, the tensile strength of the bulk fiber is damaged greatly and the ILSS of its composites is increased only to 70.8 MPa.
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