聚晶金刚石复合片的室温去钴工艺及耐磨性研究

A study on Cobalt removal technique and wear resistance of polycrystalline diamond compact at indoor temperature

聚晶金刚石复合片(PDC)工作时,可能在内部残余钴元素的催化作用下,转化为石墨,导致复合片失效。提高PDC的性能,人们常使用强酸、强氧化剂去除PDC中残余的催化剂。文章考察了一种脱钴工艺。经实验验证,该工艺在室温下具备较高的脱钴效率,且满足工业生产环保和健康要求。脱钴深度的测试表明,脱钴深度的增加满足由菲克扩散定律所要求的时间关系。磨削测试表明,产品耐磨性能的显著提升直接决定于脱钴深度,与具体的工艺关系不大。

Polycrystalline diamond compact,or PDC,is often converted into graphite under the catalysis of residual cobalt elements,leading to the failure of PDC.To avoid the thermal failure,the strong acid and/or strong oxidation are often applied to remove the residual Cobalt from PDC.In this paper a Cobalt-removal technique,which performs significant temporal efficiency at room temperature,and compromises with industry request on environmental hazard and personnel health,was introduced.Experiments showed that the cobalt-removing efficiency of our technique satisfied to the time relation determined by Fick’s law of diffusion.Milling test indicated the improvement of wear resistance directly corresponded to Cobalt-removal depth,and had few relation to technique varieties.