3D Glass Ceramic Articles Dimensional Precision Control
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Solution Overview
Problem
Conventional methods for forming 3D glass ceramic articles face challenges in achieving precise dimensional control and maintaining shape integrity during the ceramming process, particularly for thin glass articles, due to volume changes and distortions during crystallization, which leads to costly and inefficient production with short mold life.
Innovation Solution
The process involves nucleating the glass article before placing it in a mold, where it is rapidly heated to a crystallization temperature under pressure, allowing quick crystal growth and minimizing deformation, while maintaining a low crystal phase content to maintain viscosity for shaping, and subsequent cooling and ion exchange strengthening for enhanced mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If glass articles are cerammed using conventional methods, then glass ceramic articles are formed, but dimensional precision and shape integrity deteriorate due to volume changes and distortions during crystallization
Solution Approach 1:
The glass article is nucleated before being placed in the mold, creating a controlled crystal nucleus structure in advance. This preliminary nucleation allows subsequent crystallization to proceed in a controlled manner, minimizing uncontrolled volume changes and distortions that would otherwise occur during the ceramming process
Solution Approach 2:
The process utilizes controlled changes in temperature and crystal phase content parameters. By rapidly heating to crystallization temperature and maintaining low crystal phase content during shaping, then increasing crystal content after shaping, the method controls viscosity changes to maintain dimensional precision while achieving complete crystallization
2Stability of the object's composition
If glass articles are cerammed with high crystal phase content, then complete crystallization is achieved, but viscosity decreases causing deformation and loss of shape control
Solution Approach 1:
Nucleation is performed before molding to establish crystal nuclei in advance. This allows the glass to have sufficient viscosity during shaping while ensuring complete crystallization will occur later, as the nuclei provide templates for crystal growth after the shaping operation is complete
Solution Approach 2:
The process dynamically adjusts crystal phase content at different stages: maintaining low crystal phase content during shaping to preserve viscosity and shape control, then increasing crystal phase content after shaping to achieve complete crystallization and final mechanical properties
3Productivity
If rapid crystallization is performed, then production efficiency is improved, but dimensional distortion increases
Solution Approach 1:
By pre-nucleating the glass before molding, the crystallization process is initiated in advance with controlled nucleus formation. This allows rapid subsequent crystallization without excessive distortion because the nuclei provide controlled growth points rather than allowing uncontrolled crystallization to begin during shaping
Solution Approach 2:
The process uses rapid temperature changes to achieve fast crystallization kinetics. By rapidly heating to crystallization temperature and controlling the thermal profile, complete crystallization is achieved in short timeframes while maintaining dimensional control through the pre-established nucleus structure and controlled crystal phase content
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method results in 3D glass ceramic articles with improved dimensional precision, reduced distortion, and enhanced mechanical strength, including compressive stress, central tension, and depth of compression, while also extending mold life and reducing production costs.
Implementation Method 1
heating the nucleated glass article to a crystallization temperature... holding the nucleated glass article at the crystallization temperature for a duration sufficient to crystallize the nucleated glass article
Implementation Method 2
The three dimensional glass ceramic article is strengthened by ion exchange
Data Source
AI summary
A three dimensional glass ceramic article with a thickness between 0.1 mm and 2 mm, having a dimensional precision control of less than or equal to ±0.1 mm. A method for forming a three dimensional glass ceramic article including placing a nucleated glass article into a mold, and heating the nucleated glass article to a crystallization temperature, where the nucleated glass article is in the mold during the heating. Then, holding the nucleated glass article at the crystallization temperature for a duration sufficient to crystallize the nucleated glass article and form a three dimensional glass ceramic article, where the nucleated glass article is in the mold during the holding, and removing the three dimensional glass ceramic article from the mold.