Crystallized glass, magnetic disc substrate and magnetic disc
AssigneeNGK Insulators, Ltd.
InventorsMasahiro Abe, Takahiro Takahashi
Life of this patent
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Abstract
A crystallized glass has a main crystal phase of petalite (Li2O.Al2O3.8SiO2) phase and lithium disilicate (Li2O.2SiO2) phase and an auxiliary crystal phase of α-quartz phase. In the crystallized glass, a crystal phase composition measured by Rietvelt method is as follows: 20 wt %≦petalite phase≦40 wt %, 25 wt %≦lithium disilicate phase≦45 wt %, and 10 wt %≦α-quartz phase≦25 wt %.
Claims6
A crystallized glass, which has a main crystal phase of petalite (Li2O.Al2O3.8SiO2) phase and lithium disilicate (Li2O.2SiO2) phase and an auxiliary crystal phase of α-quartz phase, comprising a crystal phase composition measured by Rietvelt method of:
- 20 wt %≦petalite phase≦40 wt %,
- 25 wt %≦lithium disilicate phase≦45 wt %, and
- 10 wt %≦α-quartz phase≦25 wt %.
Dependencies are inferred from the claim text.