US2003125183A1PendingUtilityA1
Glass-ceramic composition for recording disk substrate
Priority: Jul 6, 1999Filed: Dec 4, 2002Published: Jul 3, 2003
Est. expiryJul 6, 2019(expired)· nominal 20-yr term from priority
G11B 5/73921C03C 10/0027C03C 3/097
44
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Claims
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 SiO 2 , from 3 to 15 wt % of Al 2 O 3 , from 3 to 15 wt % of Li 2 O, from 0.2 to 5 wt % of P 2 O 5 , and from 0.1 to 0.8 wt % of ZrO 2 .
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . 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 SiO 2 , from 3 to 15 wt % of Al 2 O 3 , from 3 to 15 wt % of Li 2 O, from 0.2 to 5 wt % of P 2 O 5 , and from 0.1 to 0.8 wt % of ZrO 2 .
2 . A glass ceramics composition as claimed in claim 1 , wherein said glass ceramic composition consisting essentially, expressed in terms of weight percent on the oxide basis, of
from 0.1 to 5 wt % of CaO.
3 . A glass ceramics composition as claimed in claim 1 , wherein said glass ceramic composition consisting essentially, expressed in terms of weight percent on the oxide basis, of
from 0.1 to 5 wt % of K 2 O.
4 . A glass ceramics composition as claimed in claim 1 , wherein said glass ceramic composition consisting essentially, expressed in terms of weight percent on the oxide basis, of
from 0.1 to 5 wt % of Sb 2 O 3 .
5 . A glass ceramics composition as claimed in claim 1 , wherein said glass ceramic composition consisting essentially, expressed in terms of weight percent on the oxide basis, of
from 0.1 to 15 wt % of B 2 O 3 .
6 . A glass ceramics composition as claimed in claim 1 , wherein said glass ceramic composition consisting essentially, expressed in terms of weight percent on the oxide basis, of
from 0.1 to 12 wt % of MgO.
7 . A glass ceramics composition as claimed in claim 1 , wherein said glass ceramic composition consisting essentially, expressed in terms of weight percent on the oxide basis, of
from 0.1 to 5 wt % of BaO.
8 . A glass ceramics composition as claimed in claim 1 , wherein said glass ceramic composition consisting essentially, expressed in terms of weight percent on the oxide basis, of
from 0.1 to 5 wt % of ZnO.
9 . A glass ceramics composition as claimed in claim 1 , wherein said glass ceramic composition consisting essentially, expressed in terms of weight percent on the oxide basis, of
from 0.1 to 5 wt % of Nb 2 O 5 .
10 . A glass ceramics composition as claimed in claim 1 , wherein said glass ceramic composition consisting essentially, expressed in terms of weight percent on the oxide basis, of
from 0.1 to 5 wt % of Ta 2 O 5 .
11 . A glass ceramics composition as claimed in claim 1 , wherein said glass ceramic composition consisting essentially, expressed in terms of weight percent on the oxide basis, of
from 0.1 to 5 wt % of La 2 O 3 .
12 . 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 SiO 2 , from 3 to 15 wt % of Al 2 O 3 , from 3 to 15 wt % of Li 2 O, from 0.2 to 5 wt % of P 2 O 5 , and from 0.1 to 0.8 wt % of ZrO 2 .
13 . A recording disk substrate as claimed in claim 12 , wherein said glass ceramic composition consisting essentially, expressed in terms of weight percent on the oxide basis, of
from 0.1 to 5 wt % of CaO.
14 . A recording disk substrate as claimed in claim 12 , wherein said glass ceramic composition consisting essentially, expressed in terms of weight percent on the oxide basis, of
from 0.1 to 5 wt % of K 2 O.
15 . A recording disk substrate as claimed in claim 12 , wherein said glass ceramic composition consisting essentially, expressed in terms of weight percent on the oxide basis, of
from 0.1 to 5 wt % of Sb 2 O 3 .
16 . A recording disk substrate as claimed in claim 12 , wherein said glass ceramic composition consisting essentially, expressed in terms of weight percent on the oxide basis, of
from 0.1 to 15 wt % of B 2 O 3 .
17 . A recording disk substrate as claimed in claim 12 , wherein said glass ceramic composition consisting essentially, expressed in terms of weight percent on the oxide basis, of from 0.1 to 12 wt % of MgO.
18 . A recording disk substrate as claimed in claim 12 , wherein said glass ceramic composition consisting essentially, expressed in terms of weight percent on the oxide basis, of
from 0.1 to 5 wt % of BaO.
19 . A recording disk substrate as claimed in claim 12 , wherein said glass ceramic composition consisting essentially, expressed in terms of weight percent on the oxide basis, of
from 0.1 to 5 wt % of ZnO.
20 . A recording disk substrate as claimed in claim 12 , wherein said glass ceramic composition consisting essentially, expressed in terms of weight percent on the oxide basis, of
from 0.1 to 5 wt % of Nb 2 O 5 .
21 . A recording disk substrate as claimed in claim 12 , wherein said glass ceramic composition consisting essentially, expressed in terms of weight percent on the oxide basis, of
from 0.1 to 5 wt % of Ta 2 O 5 .
22 . A recording disk substrate as claimed in claim 12 , wherein said glass ceramic composition consisting essentially, expressed in terms of weight percent on the oxide basis, of
from 0.1 to 5 wt % of La 2 O 3 .
23 . A recording disk substrate as claimed in claim 12 , wherein the glass ceramic includes crystalline phase of quartz.
24 . A recording disk substrate as claimed in claim 12 , wherein the glass ceramic includes crystalline phase of lithium disilicate.Join the waitlist — get patent alerts
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