Fundamental Study for Comparison of Dry and Wet Grinding Using Bending Tests of Glass

Fine powders are prepared by dry or wet grinding process, and there are many mechanical properties which have direct effects upon the grindability of solids, e. g., breaking properties are related to the grindability and the breaking strength is affected by the grinding atmospheres. In this work, ball mill grinding and bending test were carried out using glass material in order to investigate the difference between dry and wet grinding. It was found that the wet strength of glass is less than the dry one, and that the crack length in water is larger than that in air. Therefore a wet grinding process is preferable for grinding powders with a high strength.