| 摘要 |
PURPOSE:To produce a substrate of which smoothness and cleanliness are improved on the surface by adhering high-purity >=99.0% Al with the prescribed thickness to the surface of a blank plate prior to mechanical or chemical surface smoothing processing to the blank plate or after the surface smoothing processing. CONSTITUTION:After planning the Al alloy blank plate by a required method and executing thermal correction for the purposes of the removal of distortion, etc., mechanical or chemical surface smoothing processing is applied to adjust the surface and to finish the objective magnetic disc substrate. Prior to or after the surface smoothing processing, high purity >=99.0% Al is adhered to the surface of the blank plate to form the high-purity Al layer with the prescribed thickness on the surface of the blank plate. The adhesion of the high-purity Al to the blank plate surface is generally performed by various methods such as physical and chemical vapor deposition methods, but the physical vapor-deposition method such as vacuum vapor deposition, ion plating method and sputtering method is properly adopted. |
