CXV. An interferometric investigation of the abrasion hardness properties of diamond

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Abstract
The abrasion properties of several diamonds have been investigated using a multiple beam interferometric technique. The cube, dodecahedron and octahedron planes were abraded in various directions using a special micro abrasion tester. Abrasion only occurred in directions parallel to crystallographic axes; that is in four directions on cube planes and in two on dodecahedron planes, whereas no abrasion at all was produced on either natural or cleavage octahedron planes. Not all these directions were equally favourable; although it was found that an exact orientation reduced the vector effect. Taking the most favourable direction in each case the dodecahedron surfaces were easier to abrade than the cube surfaces. In addition the interferograms show that the abrading wheel moved in both lateral and longitudinal directions whilst abrading and at the same time probably suffered elastic deformation. It can be seen that the sides of an abrasion were highly polished and that there was no large scale deformation of the surrounding surface.

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