| 摘要 |
PURPOSE:To improve smoothness of surfaces without strain by abrading polycrystal ferrite to be used for magnetic heads with a suspension in pure water of magnesium oxide fine powder with a particle size of 0.001-0.05mum. CONSTITUTION:A polisher made from a predetermined material is constituted to be rotatable in a suspension in pure water of magnesium oxide fine powder, and a rotary member on which objects to be abraded are hooked is attached to the surface of the polisher, then the objects are abraded while being rotated. It is proper to use MgO fine powder with a particle size of 0.001-0.05mum, and the processing efficiency is improved by using a suspension in pure water of MgO fine powder in an alkaline region and also making the ratio of MgO fine powder 0.5-20 percent, by volume. In addition, a good surface condition is obtained if the iodine absorption in the MgO fine powder is kept in the range of 40- 120mg/g. |
