Related Experiment Video
Updated: Apr 28, 2026
04:41
Optimized Sealing Process and Real-Time Monitoring of Glass-to-Metal Seal Structures
Published on: September 2, 2019
6.8K
Pressure-induced changes in interdiffusivity and compressive stress in chemically strengthened glass
Mouritz N Svenson1, Lynn M Thirion, Randall E Youngman
1Section of Chemistry, Aalborg University , Aalborg 9000, Denmark.
ACS Applied Materials & Interfaces
|June 10, 2014
Summary
High pressure alters glass atomic structure, impacting properties. Compressing glass before or after ion exchange significantly enhances its strength and hardness, offering new possibilities for stronger materials.
Area of Science:
- Materials Science
- Solid State Chemistry
- Geophysics
Background:
- Glass properties are tunable via atomic structure manipulation under compression.
- Chemical strengthening via ion exchange (K(+)-for-Na(+)) is crucial for advanced glass applications.
- The combined effects of high pressure and ion exchange on glass properties are not well understood.
Purpose of the Study:
- To investigate the influence of isostatic compression on the mechanical properties of ion-exchanged glass.
- To understand the relationship between pressure-induced structural changes and alkali ion diffusion.
- To explore how compression affects the chemical strengthening of sodium-magnesium aluminosilicate glass.
Main Methods:
- Isostatic compression of bulk glass samples up to 1 GPa at elevated temperatures using a specialized gas pressure chamber.
- Performing ion exchange (K(+)-for-Na(+)) treatment before and after compression.
- Analyzing changes in alkali interdiffusivity, compressive stress, diffusion profiles, and mechanical hardness.
Main Results:
- Compression prior to ion exchange decreased Na(+)-K(+) interdiffusivity, increased compressive stress, and slightly enhanced hardness.
- Compression after ion exchange altered potassium-sodium diffusion profiles and significantly increased glass hardness.
- Observed changes are attributed to structural modifications in network-modifier environments and overall network densification.
Conclusions:
- Isostatic compression significantly influences the outcomes of chemical strengthening in aluminosilicate glasses.
- Understanding pressure-induced structural changes is key to optimizing glass properties for demanding applications.
- This research provides insights into tailoring glass mechanical performance through combined pressure and ion exchange treatments.
More Related Videos
Related Concept Videos
01:09Thermal Stress
2.5K
If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
2.5K
01:24Stress-Strain Diagram - Brittle Materials
4.5K
Brittle materials, including glass, cast iron, and stone, exhibit unique characteristics. They fracture without considerable change in their elongation rate, indicating that their breaking and ultimate strength are equivalent. Such materials also show lower strain levels at the point of rupture. The failure in brittle materials predominantly results from normal stresses, as evidenced by the rupture created along a surface perpendicular to the applied load. These materials do not display...
4.5K
01:21Plastic Behavior
809
A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
809
01:24Stress Concentrations
834
Stress concentration is when stress intensifies near discontinuities such as holes or abrupt cross-sectional changes in a structural member. This localized stress can often surpass the average stress within the member. The stress distribution in flat bars, either with a circular hole or varying widths connected by fillets, can be determined experimentally using a photoelastic method. The results are based on ratios of geometric parameters like the ratio of the hole's radius to the smaller...
834
01:13Stress Concentrations
813
The concept of stress concentration is crucial for understanding how materials respond under bending stresses, particularly when there are irregularities or discontinuities in the material's geometry. Normally, stress in a symmetric member subjected to pure bending is assumed to be uniformly distributed across the entire cross-section. However, this assumption does not hold when there are variations in the cross-sectional geometry or the presence of notches and holes.
The stress...
The stress...
813
01:22Problem Solving on Stress and Strain
1.9K
Stress is a quantity that describes the magnitude of a force that causes deformation, generally defined as internal force per unit area. When forces pull on an object and cause its elongation, like the stretching of an elastic band, it is called tensile stress. When forces cause the compression of an object, it is known as compressive stress. When an object is being squeezed uniformly from all sides, like a submarine in the depths of the ocean, we call this kind of stress bulk stress (or volume...
1.9K