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Optimized Sealing Process and Real-Time Monitoring of Glass-to-Metal Seal Structures

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Crack-resistant Al2O3-SiO2 glasses.

Gustavo A Rosales-Sosa¹, Atsunobu Masuno¹, Yuji Higo²

¹Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8505, Japan.

Scientific Reports

|April 8, 2016

Summary

Researchers developed new aluminum oxide-silicon dioxide (Al2O3-SiO2) glasses that are both hard and crack-resistant. These advanced materials overcome limitations in conventional glasses, offering improved durability for various applications.

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Area of Science:

Materials Science
Glass Science and Technology
Ceramic Engineering

Background:

Achieving glasses with both high hardness and crack resistance is a significant challenge in glass science.
Commercial glasses often exhibit a trade-off between hardness and crack resistance, limiting their performance.
Conventional oxide glasses typically show increased crack formation with higher atomic packing density.

Purpose of the Study:

To fabricate and characterize binary aluminum oxide-silicon dioxide (Al2O3-SiO2) glasses.
To investigate the relationship between atomic packing density and mechanical properties (hardness, elastic moduli, crack resistance).
To identify compositions that yield hard and damage-tolerant glasses.

Main Methods:

Fabrication of colorless and transparent Al2O3-SiO2 glasses with varying compositions (30 ≤ x ≤ 60) using aerodynamic levitation.
Measurement of elastic moduli and Vickers hardness.
Evaluation of indentation cracking resistance.

Main Results:

Elastic moduli and Vickers hardness increased monotonically with increasing Al2O3 content and atomic packing density.
Indentation cracking resistance significantly improved, increasing approximately sevenfold with atomic packing density.
The mullite composition (60Al2O3 • 40SiO2) exhibited exceptional cracking resistance, high elastic moduli, and Vickers hardness.

Conclusions:

Binary Al2O3-SiO2 glasses can be engineered to possess both high hardness and excellent crack resistance.
Atomic packing density is a key factor in enhancing mechanical properties, including damage tolerance.
Specific aluminosilicate compositions, like mullite, offer a pathway to developing superior hard and damage-tolerant glasses.