Method of manufacturing a magnetic recording disk using glass substrate

Abstract

A glass substrate manufacturing method advantageously applicable to magnetic recording disk glass substrates, LCD glass substrates, photomask glass substrates, or optical memory glass substrates. The glass substrate is formed by chemically strengthening a glass substrate by immersing the glass substrate in a chemical reinforcement solution heated and then ion exchanging ions on the surface layer of the glass substrate with ions in the chemical reinforcement solution; removing the substrate from the chemical reinforcement solution and then annealing it to a temperature higher than the crystallization temperature of a molten salt; rapidly cooling the glass substrate at a rate at which the crystallization of the molten salt deposited on the surface of the glass substrate is prevented; and then cleaning the surface of the glass substrate. Moreover, the glass substrate is formed by chemically strengthening a glass substrate by immersing the glass substrate in a chemical reinforcement solution heated and then ion exchanging ions on the surface layer of the glass substrate with ions in the chemical reinforcement solution; and removing the substrate from the chemical reinforcement solution and then cleaning the surface of the glass substrate with a cleaning agent containing acid.