纳米晶多晶体金刚石超细微粉在表面技术中的应用

Nano-polycrystal Diamond Superfine Powders and Its Application in Surface Techniques

纳米晶多晶体金刚石超细精微粉是一种用动态法爆炸合成的金刚石,它与用静态法压机合成的单晶体金刚石不同,颗粒由纳米晶织构体组成,呈不规则形状,表面凹凸不平,而后者颗粒呈多面体单晶状,表面光滑,棱边平直。作为磨粒,多晶体金刚石具有更多的切削刃,切削效率高。作为复合镀层中的增强粒子,它与镀层金属的接触面更大、机械结合力更强,使用时不易剥落,优势明显。在国外,它广泛应用于硬质合金、人工晶体、玉石、红宝石、蓝宝石和钻石等各种材料的表面精细加工领域中,以及作为电镀和化学镀的增强相。

A sort of nano polycrystal diamond superfine powders was synthesized with an explosion shock method, one of dynamic ways. It is different with singlecrystal diamond which synthesized by static pressure way. The polycrystal diamond gains are composed of many nanon sized texture subcrystals. The grains have irregular shapes and their surfaces are rough; Nevertheless the singlecrystal diamond grains have regular polyhedra shapes and theirsurfaces are smooth. As a sort of grains, the polycrystal diamond has more cutting edges and so it has higher abrasive efficiency. As a sort of strengthen grains in composited electroplating and chemical plating, it has obviously superiority, for the touch area with the plating matel is more wide, the binding force is more powerful, so it was hardly stripped from the coatings. At aborad, usually it is used in fine grind and polich process on the surfaces of hard allowys, jades, sapphies, diamonds and many synthetic crystals, it is also used in electroplating and chemical plating as a sort of strengthen grains.