采用复合电沉积法制备了金刚石切割线,主要工艺流程为:钢丝和金刚石粉的镀前处理,碱性预镀铜,金刚石上砂镀(铜-金刚石复合镀),加厚镀镍,后处理.通过测定镀液的阴极极化曲线以及镀层的表面形貌、力学性能和结合力等,研究了电流密度、镀液中金刚石含量、搅拌速率、电镀时间等工艺参数对金刚石上砂效果的影响.实验表明,随着镀液中金刚石含量的增大,铜-金刚石共沉积的阴极极化曲线负移,相同电位下的电流减小;低电压下,相同电位处的阴极电流随搅拌速率增大而增大,高电压下反之.随着阴极电流密度提高或施镀时间延长,金刚石上砂量呈先增后减的趋势.经200℃热处理2h后,金刚石切割线的最大拉断力和抗拉强度分别为159.7 N和2 258.8 MPa,力学性能明显改善.在电流密度5～7 A/dm2下制备的金刚石切割线,其镀层和钢基体之间的结合力良好.
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