Inorganic composition article
AssigneeKabushiki Kaisha Ohara
InventorsKOHEI OGASAWARA, SAYA KIKKAWA, TOSHITAKA YAGI
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Abstract
Provided is an inorganic composition article which contains, as a main crystal phase, at least one selected from an α-cristobalite and an α-cristobalite solid solution, and is obtained by strengthening crystallized glass containing, in terms of oxide mass %, 50.0%-75.0% of SiO2, 3.0%-10.0% of Li2O, 5.0% to 15.0% (exclusive of 15.0%) of Al2O3, 0% to 10.0% (exclusive of 0%) of B2O3, and 0% to 10.0% (exclusive of 0%) of P2O5, wherein a mass ratio SiO2/(B2O3+Li2O) is 3.0-10.0. A thickness (DOLzero) of a compressive stress layer on a surface is 8.0%-25.0% of a plate thickness of the inorganic composition article, and a center tensile stress (CT) is 70 MPa-120 MPa.
Claims8
An inorganic composition article comprising,
- as a main crystal phase, one or more selected from α-cristobalite and an α-cristobalite solid solution, wherein,
- the inorganic composition article is obtained by strengthening a crystallized glass,
- a thickness (DOLzero) of a compressive stress layer on the surface is 8.0% to 25.0% of a sheet thickness of the inorganic composition article,
- a central tensile stress (CT) is 70 MPa to 120 MPa, and
- in the crystallized glass, in mass % in terms of oxides,
- a content of a SiO2 component is 50.0% to 75.0%,
- a content of a Li2O component is 3.0% to 10.0%,
- a content of an Al2O3 component is 5.0% or more and less than 15.0%,
- a content of a B2O3 component is more than 0% and 10.0% or less,
- a content of a P2O5 component is more than 0% and 10.0% or less, and
- a mass ratio SiO2/(B2O3+Li2O) is 3.0 to 10.0.
An inorganic composition article comprising,
- as a main crystal phase, one or more selected from α-cristobalite and an α-cristobalite solid solution, wherein,
- the inorganic composition article is obtained by strengthening a crystallized glass,
- a thickness (DOLzero) of a compressive stress layer on the surface is 8.0 μm to 500 μm,
- a central tensile stress (CT) is 70 MPa to 120 MPa, and
- in the crystallized glass, in mass % in terms of oxides,
- a content of a SiO2 component is 50.0% to 75.0%,
- a content of a Li2O component is 3.0% to 10.0%,
- a content of an Al2O3 component is 5.0% or more and less than 15.0%,
- a content of a B2O3 component is more than 0% and 10.0% or less,
- a content of a P2O5 component is more than 0% and 10.0% or less, and
- a mass ratio SiO2/(B2O3+Li2O) is 3.0 to 10.0.
Dependencies are inferred from the claim text.