A Fundamental Study of Dry and Wet Grinding from the Viewpoint of Bending Tests by Drop Weight Method

The preparation of fine powders by grinding may be accomplished by either a wet or a dry process andthe differences between these have been discussed. The difference of breaking strength in differentatmospheres affects the grindabilities. In this study, bending tests were carried out using a drop weightmethod on glass material in order to investigate the quantitative effect of water atmosphere on strength. Theinfluence of the crack length of the glass surface on the difference of fracture probability in water and in airwas also studied. As a result, it was found that the fracture probability in water was larger than that in airwhen the input energy in specimen was constant. Then, the difference of the fracture energy in water and inair increased with decreasing the crack length.