A STUDY ON THE MIRROR-LIKE GRINDING OF MGO SINGLE-CRYSTAL WITH VARIOUS DIAMOND WHEELS

In recent years, MgO single crystals of brittle materials have been us ed widely in materials of high-temperature superconductivity, thin-fil m substrates and laser parts, but it is difficult to grind such crysta ls because of their brittleness and crack generation. Therefore, a sup er-abrasive diamond wheel is required for the mirror-like grinding of these materials. An optimum in-process electrolytic dressing system wa s constructed and the characteristics of the mirror-like grinding of M gO single crystals were studied with various metal-bonded super-abrasi ve diamond wheels. It is found that a finer super-abrasive wheel is pr efable in obtaining the mirror-like grinding and surface grinding with out cracks, with MgO single crystals. (C) 1997 Elsevier Science S.A.