| 摘要 |
PURPOSE:To finely polish a crystallized glass by performing lap-polishing in the polishing liquid in which the fine anhydrous alumina powder having a surface area per volume of 130m<2>/g or less and a spherical particle size of 320Angstrom or less is suspended. CONSTITUTION:The ground surface of a photocerum made of crystallized glass to be polished is attached onto the surface of a polisher, and revolved under the working condition, for example, of a revolution number of 60rpm, lap load of 0.5kg/cm<2>, and a load of 3kg/cm<2>, and polishing is carried out for 30min, dripping the polishing liquid continuously at a rate of 100cc/hr. Therefore, the formation of projections and concaved parts on the surface of the crystallized glass can be prevented, and the superior surface roughness in 20Angstrom or so can be obtained. |
