Effect of Process Conditions on Wet-rotating Disc Milling for Exfoliation of Hexagonal Boron Nitride

Abstract

Hexagonal boron nitride (h-BN) as laminated layered particle was exfoliated with a wet-rotating disc milling process by changing various process conditions, such as rotating speed, disc clearance, solids loading, flow rate and flow pass. The particle size distribution showed that the lateral size of h-BN particles milled by wet-rotating disc milling was depended on the flow rate and solids loading, and was relatively as similar as that of raw h-BN particles with controlling the process conditions of wet-rotating disc milling. Furthermore, the sedimentation test of milled h-BN particles indicated that the sedimented cake height ratio of milled h-BN particles was higher with increasing the rotating speed and flow pass and decreasing the disc clearance. Also, thickness of h-BN particles was decreased with increasing the sedimented cake height ratio. These various evaluations indicated that the wet-rotating disc milling led to exfoliation of h-BN particles effectively.