Enamel composition ensuring excellent thermal shock resistance, preparation method thereof and cooking appliance
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Solution Overview
Problem
Existing enamel compositions for cooking appliances suffer from defects such as chipping due to residual stress caused by thermal expansion differences between the base material and the enamel, especially during high-temperature pyrolysis processes.
Innovation Solution
An enamel composition comprising a glass frit, a siloxane-based compound, a silane-based compound, and mill additions such as SiO2, Al2O3, ZrO2, and TiO2, which helps to improve thermal shock resistance and prevent chipping by controlling the bubble structure and viscosity of the enamel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ordinary enamel composition is used for pyrolysis at high temperature, then cleaning function is achieved, but thermal shock resistance deteriorates due to residual stress from thermal expansion difference
Solution Approach 1:
The patent modifies the chemical composition parameters of the enamel by incorporating specific amounts of P2O5 (1-5 wt%), SiO2 (70-85 wt%), and B2O3 (5-15 wt%), which changes the thermal expansion coefficient and viscosity characteristics of the enamel, enabling it to withstand thermal shock while maintaining cleaning functionality
Solution Approach 2:
The patent creates a composite enamel system combining multiple oxide components (P2O5, SiO2, B2O3, Al2O3, CaO, MgO) that work synergistically to provide both cleaning function through pyrolysis and thermal shock resistance by controlling thermal expansion and bubble structure
2Productivity
If enamel is subjected to high temperature pyrolysis, then contaminants are removed, but defects such as chipping occur due to residual stress
Solution Approach 1:
The patent adjusts the chemical composition parameters to achieve optimal viscosity at pyrolysis temperature, allowing bubbles to escape smoothly without causing surface defects, while maintaining the ability to decompose contaminants
Solution Approach 2:
The patent controls the formation of bubble structures within the enamel matrix during pyrolysis, creating a optimized porous structure that facilitates contaminant removal while preventing surface chipping through controlled bubble release
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 proposed enamel composition ensures excellent thermal shock resistance and cleaning function, preventing defects like chipping during high-temperature use, thereby increasing the lifespan of the enamel and reducing maintenance costs.
Implementation Method 1
controlling the bubble structure and viscosity of the enamel
Implementation Method 2
the process of pyrolysis (thermal decomposition) by which contaminants are burned to ashes at high temperatures
Implementation Method 3
residual stress occurs due to a difference between the coefficient of thermal expansion of a base material and the coefficient of thermal expansion of enamel
Data Source
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AI summary
The present disclosure relates to an enamel composition, a preparation method thereof and a cooking appliance, the enamel composition comprising a glass frit, a siloxane-based compound, a silane-based compound, and mill addition comprising one or more that is selected from a group comprised of SiO2, Al2O3, ZrO2 and TiO2, thereby suppressing defects such as chipping even when the enamel composition is used at high temperature, for pyrolysis of contaminants.