High rigidity glass-ceramic substrate for a magnetic information storage medium
AssigneeKabushiki Kaisha Ohara
InventorsNaoyuki Goto, Kousuke Nakajima, Junko Ishioka
Life of this patent
Estimating the term…
Abstract
A high rigidity glass-ceramic substrate for a magnetic information storage medium has a ratio of Young's modulus to specific gravity within a range from 37 to 63 and comprises Al2O3 within a range from 10% to less than 20%. Predominant crystal phases of the glass-ceramic substrate consist of (1) cordierite or cordierite solid solution and (2) one or more crystals selected from the group consisting of Spinel crystal, Spinel crystal solid solution, enstatite, enstatite solid solution, β-quartz and β-quartz solid solution.
Claims8
A high rigidity glass-ceramic substrate for a magnetic information storage medium having a ratio of Young's modulus to specific gravity within a range from 37 to 63, which comprises Al2O3 within a range from 10% to less than 20%, wherein the predominant crystal phases consist of (1) cordierite or cordierite solid solution and (2) one or more crystals selected from the group consisting of Spinel crystal, Spinel crystal solid solution, enstatite, enstatite solid solution, β-quartz and β-quartz solid solution.
Dependencies are inferred from the claim text.