Inorganic composition items

The inorganic composition article with controlled CT and DOLzero addresses the cracking issue of conventional glass by enhancing mechanical strength and crack resistance, suitable for protective applications in harsh environments.

JP7893832B2Active Publication Date: 2026-07-22OHARA INC
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
OHARA INC
Filing Date
2023-12-21
Publication Date
2026-07-22

AI Technical Summary

Technical Problem

Conventional chemically strengthened glass is prone to cracking into small fragments when dropped on rough surfaces due to high central tensile stress and insufficient compressive stress layer thickness, posing a risk in harsh environments.

Method used

An inorganic composition article comprising crystallized glass with a controlled central tensile stress (CT) of 70-120 MPa and a compressive stress layer thickness (DOLzero) of 8-25% of the plate thickness, primarily composed of α-cristobalite and α-cristobalite solid solutions, with specific oxide content ratios to enhance mechanical strength and resistance to cracking.

Benefits of technology

The composition provides enhanced impact resistance, reducing the likelihood of glass fragmentation into small chips and improving crack resistance, making it suitable for protective applications in harsh environments.

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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.
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