Effect of texture vehicle and diamond on SNR and surface topography of media

Abstract

The mechanical texturing process is that which is utilized to generate circumferential texture patterns on the NiP surface using a pliable tape while supplying a lubricant and diamond slurry. We investigate the texture surface roughness, texture parameter δ/ λ, texture scratch defects, orientation ratio (OR) and signal to noise ratio (SNR) performances of disks prepared by three combinations of thermally heat-treated diamond (THT) and ultra-dispersed diamond (UDD) with coolants labeled A1 and M1. Experimental results show that the substrates textured with UDD/M1 slurry can create a disk surface with the highest parameter δ/ λ, which results in the highest OR and SNR, as compared to substrates textured with THT/A1 and THT/M1 slurries. By increasing the texture coolant concentration from 5 to 25%, the zeta potential, diamond size, texture roughness, texture scratch pixel count, parameter δ/ λ, OR and SNR increase dramatically. The UDD diamond and 10 wt% M1 coolant showed the best performance with respect to lower surface finish ( Ra), lower scratches and higher SNR.