Glass-ceramic composition for recording disk substrate
OwnerHideki Nagata, Hideki Kawai +3inventors
InventorsHideki Nagata, Hideki Kawai, Toshiharu Mori, Hiroshi Yuki, Kazuhiko Ishimaru
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Abstract
A glass ceramics composition for recording disk substrate consists essentially, expressed in terms of weight percent on the oxide basis, of from 65 to 80 wt % of SiO2, from 3 to 15 wt % of Al2O3, from 3 to 15 wt % of Li2O, from 0.2 to 5 wt % of P2O5, and from 0.1 to 0.8 wt % of ZrO2.
Claims24
A glass ceramics composition for recording disk substrate consisting essentially, expressed in terms of weight percent on the oxide basis, of
- from 65 to 80 wt % of SiO2,
- from 3 to 15 wt % of Al2O3,
- from 3 to 15 wt % of Li2O,
- from 0.2 to 5 wt % of P2O5, and
- from 0.1 to 0.8 wt % of ZrO2.
A recording disk substrate made of glass ceramic, wherein the glass ceramics composition for recording disk substrate consisting essentially, expressed in terms of weight percent on the oxide basis, of
- from 65 to 80 wt % of SiO2,
- from 3 to 15 wt % of Al2O3,
- from 3 to 15 wt % of Li2O,
- from 0.2 to 5 wt % of P2O5, and
- from 0.1 to 0.8 wt % of ZrO2.
Dependencies are inferred from the claim text.