ABRASIVES
Synthesis of polycrystalline diamond and production of abrasives.
Functions
Abrasives are useful for shaping and decorating components (by hand or machine). Their purpose may be to remove material (lapping, flattening, Diamond polishing etc.) or to improve or decorate the surface (Satin finish, Sandblasting, watchmaking decorations and of course Polishing).
Principle and Hardness
Abrasives must always have a Hardness greater than that of the Material to be treated. Thus, to polish a Crystal (watch glass) or a case made of Sapphire (synthetic corundum) with a Hardness of about 9 (on the Mohs scale), only Diamond (10 / Mohs) will be eligible. A wide variety of Abrasives can be used in watchmaking, such as emery, silica, certain ceramics, or Diamond. The grain size of the Abrasive and its calibration will determine the surface finish of the treated Material (fine or more pronounced Satin finish, quality of Polishing, etc.)
Different forms
Abrasives come in different forms (powders, liquids, pastes, papers, stones, wheels, pads, etc.). Abrasive in powder form is often used with a binder (liquid for pastes and suspensions, solid for stones and wheels).
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