【摘要】 金刚石钻头性能的优劣在很大程度上取决于包镶金刚石的胎体材料的性能。单一金属镍做胎体材料制造电镀金刚石钻头时,镀层脆硬,易影响对金刚石的包镶,需要通过使用添加剂改善胎体的性能。本文试验了在镍基镀液中加入不同量铵盐用以改变镀层的硬度和耐磨性,结果表明:随氯化铵用量(7~25 g/L)的增加,胎体的硬度和耐磨性都增加,其中当氯化铵含量为19 g/L时耐磨性最好。本文通过微机电化学分析系统测定硫酸盐的浓度、氯化铵用量、温度及pH值改变后的镀液的线性扫描极化曲线,以此分析了这几个影响因素的变化对阴极还原过程的影响,得出铵盐因影响阴极极化而改变了胎体材料的性能,增加了镍镀层的硬度和耐磨性。更多还原

【Abstract】 Performance of diamond bit depends on the performance of matrix materials which hold diamond grits to a large extent.When matrix material of diamond bit was only one metal-nickel,the matrix depositing is so hard and brittle and affect the holding strength of matrix to diamonds.Using additive can improve the performance of matrix depositing.In this paper,the hardness and wear resistance of matrix depositing with different concentration of ammonium chloride were tested.The results indicated that as the concentration of ammonium chloride(7~25 g/L) in solution increased,the deposit hardness and wear resistance were enhanced significantly.When the amount of ammonium chloride is 19 g/L,the deposit wear resistance is the best of all.After changing the concentration of main sulphate,the amount of ammonium chloride,the bath temperature and the pH value,linear scanning polarization curves of plating bath were measured by microcomputer added electrochemical analysis system.The effect of the former four factors on cathodic reduction process was analyzed.The results showed that the ammonium salt improved the deposit performance since it influenced the cathodic polarization.更多还原