| 摘要 |
PURPOSE:To obtain an alpha-alumina for abrasives, excellent in the abrading speed and the persistence of the abrasive action, little in scratch, extremely good in the roughness of the surface, and capable of being utilized for the abrasion of mirror surfaces. CONSTITUTION:The alpha-alumina for the abrasives has an average particle size (D50) of 0.5-3mum, a 90% volume particle diameter (D90) of <=10mum, a BET specific surface area of 3-7m<2>/g, an linseed oil-absorption volume of 25-6cc/100g, and a pressmolded bulk density of 1.4-1.8g/cm<3> under a pressure of 300-kg/cm<2>. |
