LAS Glass-Ceramic Composition for Thermal Expansion Matching
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Solution Overview
Problem
Glass-ceramic materials with β-quartz solid solution as the main crystal phase face challenges with low thermal expansion, leading to difficulties in joining with other materials, limited decor layer thickness, and reduced bending tensile strength due to high thermal stress, which affects their usability in applications like cooking surfaces and chimney sight windows.
Innovation Solution
Developing a lithium aluminum silicate glass-ceramic with an adaptable thermal expansion coefficient of 1.0 to 2.5·10−6/K, comprising β-quartz solid solution as the predominant phase, optimized with specific compositions of Li2O, MgO, Al2O3, SiO2, TiO2, ZrO2, and SnO2 to improve thermal matching with other materials and decor colors, allowing for increased decor layer thickness and enhanced mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If glass-ceramic materials with β-quartz solid solution are used to achieve zero thermal expansion, then temperature difference resistance and dimensional stability are improved, but joining with other materials becomes difficult and thermal stress increases
Solution Approach 1:
The patent applies parameter changes by adjusting the chemical composition of the glass-ceramic material, specifically controlling the content of Li2O (0.5-3.0 wt%), MgO (0.5-3.0 wt%), and the ratio of MgO/Li2O (0.1-2.0), to achieve a thermal expansion coefficient within 0±0.3·10−6/K in the temperature range of 20-700°C. This compositional parameter optimization enables both zero thermal expansion and improved joinability with metal materials, resolving the contradiction between reliability and ease of manufacture.
2Stability of the object's composition
If glass-ceramic materials with β-quartz solid solution are used to achieve zero thermal expansion, then dimensional stability is improved, but bending tensile strength decreases due to high thermal stress
Solution Approach 1:
The patent optimizes compositional parameters including Li2O (0.5-3.0 wt%), MgO (0.5-3.0 wt%), Al2O3 (15-30 wt%), and the MgO/Li2O ratio (0.1-2.0) to achieve a thermal expansion coefficient of 0±0.3·10−6/K. This parameter optimization simultaneously improves dimensional stability and reduces thermal stress, thereby increasing bending tensile strength to greater than 150 MPa, resolving the contradiction between stability and strength.
3Reliability
If the thermal expansion coefficient is reduced to zero, then temperature change resistance is improved, but the thickness of decor layers is limited and mechanical strength is reduced
Solution Approach 1:
The patent applies parameter changes by optimizing the chemical composition with Li2O (0.5-3.0 wt%), MgO (0.5-3.0 wt%), and controlling the MgO/Li2O ratio (0.1-2.0) to achieve zero thermal expansion. This enables the deposition of thicker decor layers without causing thermal stress cracking, as the matched thermal expansion properties allow for greater layer thickness while maintaining mechanical integrity.
4Reliability
If the thermal expansion coefficient is reduced to zero, then temperature change resistance is improved, but joining and matching with other materials becomes difficult
Solution Approach 1:
The patent optimizes compositional parameters including Li2O (0.5-3.0 wt%), MgO (0.5-3.0 wt%), and the MgO/Li2O ratio (0.1-2.0) to achieve a thermal expansion coefficient of 0±0.3·10−6/K. This parameter optimization enables the glass-ceramic to be thermally matched with various metal materials for practical applications, resolving the contradiction between temperature change resistance and adaptability.
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 exhibits improved thermal matching and mechanical strength, enabling thicker decor layers, increased color covering power, and reduced thermal stress, thus broadening design possibilities and enhancing the performance of glass-ceramic articles in various applications.
Implementation Method 1
transparent or transparent colored lithium aluminum silicate glass-ceramic articles having an adapted thermal expansion
Implementation Method 2
consisting of a glass-ceramic comprising high/β-quartz solid solution as predominant crystal phase
Data Source
AI summary
Transparent or transparent dyed lithium aluminum silicate (LAS) glass ceramic material is provided that has an adapted thermal expansion. The material includes high-quartz mixed crystals as the predominant crystalline phase, and a thermal expansion between room temperature and 700° C. from 1.0 to 2.5·10−6/K.