Nano-diamond is formed by use of the free carbon generated by explosion with negative oxygen balance, under the action of pressure and temperature created by the detonation waves. DND diamond has excellent wear resistance, corrosion resistance and thermal conductivity, high dispersion stability and super-smooth polishing. Applied in polishing and grinding hard drive, magnetic head, precious stones, ceramic, glass and hard alloy. Also applied in oil or lubricant additive, which can significantly improve friction performance and extend life span.