| 摘要 |
This glass substrate for a HDD achieves a recording density of at least 600 Gb/sq in, and, as glass components shown in mol%, includes SiO2: 60-70%, Al2O3: 2-8%, Li2O: 0.1-7%, Na2O: 4-10%, MgO: 7-14%, CaO: 2-8%, TiO2: 0.1-4%, Nb2O5: 0.1-4%, and SiO2+Al2O3+B2O3: 65-80%, Li2O+Na2O+K2O: 7-17%, MgO+CaO+SrO+BaO+ZnO: 10-20%, Al2O3/SiO2: 0.03-0.13, (TiO2+Nb2O5)/SiO2: 0.01-0.05. |
