Abstract
Breakage behavior of fine single particles of five minerals and two coals in a size range from 88 /gmm to 1 μm was investigated by compression tests. Strength of the particles varies with particle size and their relation is similar to that of coarser particles previously given by Yashima ea. Specific fracture energy has a tendency to increase with decreasing particle size. Particles under a few micrometres deformed to a considerable extent without fracture. It may suggest even brittle materials deformed plastically. Local plastic deformation was also observed in fractured coarser particles. Critical sizes of this elastic/partially-plastic behavior and of partially-plastic/fully-plastic behavior were estimated based on theory of elasticity and microscopic observation of the particles after compression.
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