影响金刚石微粉化学镀镍品质的因素  

Factors influencing quality of electroless plating nickel on diamond powder

作　　者：方莉俐[1] 程丙良 吴晓雷 郭冉冉 李怡哲 王本海 FANG Lili;CHENG Bingliang;WU Xiaolei;GUO Ranran;LI Yizhe;WANG Benhai(Zhongyuan University of Technology, Zhengzhou 450007, China)

机构地区：[1]中原工学院,郑州450007

出　　处：《金刚石与磨料磨具工程》2019年第2期26-31,共6页Diamond & Abrasives Engineering

基　　金：河南省教育厅科学技术研究重点项目(14A140024)

摘　　要：用化学镀的方法在线锯用金刚石微粉表面镀覆一层镍,通过正交试验、SEM,探究镀液配比和工艺条件对金刚石微粉化学镀结果的影响。结果表明:镀液中络合剂对化学镀增重影响的主次排序为:柠檬酸>氨水>柠檬酸钠,但去掉柠檬酸钠会降低增重;化学镀增重率与金刚石颗粒表面沉积的镍晶粒大小有关,且镀液pH为4左右时,能得到漏镀少连晶少的镀覆金刚石微粉;当溶液中不添加稳定剂时,会有镍渣生成,而添加量过多又会抑制反应进行,此时若增大分散剂的量,可以使不反应的溶液正常发生反应;随着金刚石装载量变大,增重率降低,且装载量以6 g为好;随着温度增高,增重率变大,最佳温度应选取在80～85℃。A layer of nickel is coated on the surface of diamond powder by electroless plating. The effects of the plating bath composition and plating conditions on the results of electroless plating of diamond powder are investigated by orthogonal experiments and SEM. The results show that the influence order of complexant on weight gain is as follows: citric acid > ammonia > sodium citrate, and that the weight gain will be reduced without adding sodium citrate. The weight gain rate of electroless plating is related to the nickel grain size deposited on the surface of diamond powder, and the coated diamond powder with less leakage and less continuous crystals can be obtained when pH value is about 4. Nickel slag will be formed when not adding stabilizer, and excessive addition of stabilizer will inhibit the reaction. The reaction will proceed normally if the amount of dispersant is increased at excessive stabilizer. With the increase of diamond addition, the weight gain rate decreases and the best coating would be achieved at diamond addition of 6 g. With the increase of temperature, the rate of weight gain increases and 80~85 ℃ is the optimum range.

关 键 词：金刚石微粉 化学镀镍 增重 化学动力 

分 类 号：TQ164[化学工程—高温制品工业]