Chemically Tempered Glass-Ceramic Cover Plate for Electronics
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Solution Overview
Problem
Existing electronic device cover plates, primarily made of metal or glass, face challenges such as susceptibility to oxidation and inadequate mechanical properties, including drop resistance and fracture toughness, which are not effectively addressed by prior art.
Innovation Solution
A chemically tempered glass-ceramic article with a composition comprising lithium silicate and quartz crystalline phases, optimized with specific weight percentages of SiO2, Al2O3, Li2O, ZrO2, P2O5, K2O, MgO, ZnO, and CeO2, achieving enhanced mechanical properties and suitable for electronic device cover plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal is used as cover plate material, then mechanical strength is improved, but oxidation resistance deteriorates and electromagnetic shielding occurs
Solution Approach 1:
The patent employs glass-ceramic composite material that combines the mechanical strength of crystalline phases with the oxidation resistance of glass matrix. The material contains lithium disilicate and quartz crystalline phases dispersed in a glass matrix, achieving both high strength and chemical stability against oxidation.
2Object-affected harmful factors
If ordinary glass is used as cover plate material, then oxidation resistance is improved, but mechanical strength deteriorates
Solution Approach 1:
The patent utilizes controlled phase transition during heat treatment to transform the glass matrix into glass-ceramic with dispersed crystalline phases. By controlling nucleation and crystal growth during heat treatment, the material achieves enhanced mechanical strength while maintaining the oxidation resistance characteristic of glass materials.
3Strength
If glass-ceramic with high crystal content is used, then mechanical strength is improved, but light transmittance deteriorates
Solution Approach 1:
The patent optimizes the local distribution and size of crystalline phases within the glass-ceramic matrix. By controlling crystal size to be small and uniformly dispersed, and optimizing crystal volume fraction, the material achieves high mechanical strength while maintaining good light transmittance properties suitable for electronic device cover plates.
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
The glass-ceramic article exhibits improved mechanical strength, fracture toughness, and light transmittance, making it suitable for electronic device cover plates while overcoming the limitations of traditional materials.
Implementation Method 1
chemically tempered glass-ceramic article
Implementation Method 2
A glass-ceramic is a material that precipitates crystals inside the glass through heat-treating the glass
Data Source
AI summary
The present invention discloses a glass-ceramic article and a glass-ceramic for an electric device cover plate, the glass-ceramic comprises, as a predominant crystalline phase, lithium silicate and the quartz crystalline phase, and has a composition expressed in weight percent including: SiO2: 65-85%, Al2O3: 1-15%, Li2O: 5-15%, ZrO2: 0.1-10%, P2O5: 0.1-10%, K2O: 0-10%, MgO: 0-10%, ZnO: 0-10%, and Na2O: 0-5%, wherein (SiO2+Al2O3+Li2O+ZrO2)/P2O5 is 40-90, the falling ball test height is 700 mm or more. By reasonable component design, the present invention achieves excellent mechanical properties of the glass-ceramic and the glass-ceramic article of the present invention and obtains the glass-ceramic or the glass-ceramic article suitable for electronic devices at a lower cost.