为改进人造金刚石的表面性能,先在其上化学镀W,再化学镀Ni-P,制备了W/Ni-P包覆人造金刚石粉末.以镀液稳定性和镀层与基体结合力为评价标准,用正交试验和单因素试验优选工艺,并用扫描电镜(SEM)、能谱仪和粒度分析仪考察了优化W/Ni-P复合镀层的组织结构和镀后粉末的粒度分布.结果表明:最优化学镀W工艺为50 WL钨酸钠,32 g/L次亚磷酸钠,25 g/L柠檬酸三钠,0.002 0WL硫脲,pH值为8.5,温度为90℃,时间为1h;最优化学镀Ni-P工艺为35 g/L硫酸镍,32 g/L次亚磷酸钠,25 g/L柠檬酸三钠,0.002 0 g/L硫脲,pH值为4.5,温度为80℃,时间为1h;优化W/Ni-P层均匀细致,与金刚石结合良好,镀覆后的金刚石粉末粒度更均匀.
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