A high-strength, stable engineering stress distribution glass and its preparation method and apparatus

By heating a single-sided area of ​​the glass to create a temperature gradient and controlling the cutoff temperature of secondary ion exchange, the problem of unstable glass strength in the prior art is solved, and the high strength stability and fracture strength are improved, as well as the microhardness and Weber modulus are enhanced.

CN118047547BActive Publication Date: 2026-06-30SHAANXI UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHAANXI UNIV OF SCI & TECH
Filing Date
2024-02-02
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

The existing secondary ion exchange method treats the glass as a whole at high temperature, which leads to unstable glass strength, large differences in strength within the same batch of glass, and complex control process, making it difficult to achieve both high strength and stability.

Method used

By employing a single-sided glass heating method, a temperature gradient is created inside the glass by setting the temperature values ​​of both the hot and cold sides. This controls the cutoff temperature point for secondary ion exchange, allowing secondary ion exchange to occur only in a small area on the glass surface, thus forming an accurate engineering stress distribution.

Benefits of technology

It achieves improved stability and fracture strength of glass, increased microhardness, enhanced Weber modulus, reduced sensitivity to surface defects, reduced strength dispersion, and a simple and controllable process.

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Abstract

This invention provides a high-strength, stable engineering stress-distribution glass, its preparation method, and apparatus. One side of a glass sample that has undergone a single ion exchange is cooled to a low temperature, while the other side is brought into contact with the molten salt surface. The ion exchange temperature cutoff depth inside the glass is determined by the molten salt temperature. A second ion exchange is then performed to obtain the high-strength, stable engineering stress-distribution glass. This invention simplifies and controls the secondary ion exchange process for glass, achieving both increased glass strength and improved glass stability.
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