Exo-electron Emission from Abrasive Grains

This paper describes the exo-electron emission phenomena from the various abrasive grains which are practically used in the grinding wheel or as the lapping powder. The effects of the heat-treatment and the fracture of the test grains on the exo-electron emission were examined. The main results obtained are as follows: (1) Al2O series grains gave a strong emission intensity, specially the white-alumina grain a stronger intensity, and the alumina grain, the single crystal grain and the zirconia alumina grain an intermediate intensity. But SiC series grains gave no emission. (2) In the glow curves the emission intensity from the grains after the heat-treatment remarkably decreased. And the emission intensity increased again from the grains which were fractured after the heat-treatment. (3) In the experiments which the emission intensity from grains fractured at a constant condition was measured, the relation between the size of the test grain and the emission intensity is proportional. (4) The emission decay curve obtained with the fractured grain showed the same inclination such as the decay curve from the mechanically deformed metal surface.