| 摘要 |
<p>Provided is a method for manufacturing a magnetic disc substrate enabling embedding of alumina to be reduced. The method for manufacturing a magnetic disc substrate has the following steps (1) through (4); that is, (1) a step for polishing a surface to be polished on a substrate to be polished, the surface being polished by using a polishing liquid composition A containing alumina particles and water; (2) a step for polishing the surface to be polished of the substrate obtained in step (1) by using a polishing liquid composition B containing silica particles and water, the silica particles having an average primary particle diameter (D50) of 5 to 60 nm, and the standard deviation of the primary particle diameter being less than 40 nm; (3) a step for cleaning the substrate obtained in step (2); and (4) a step for polishing the surface to be polished of the substrate obtained in step (3) using a polishing liquid composition C containing silica particles and water.</p> |
