Enamel composition ensuring excellent thermal shock resistance, preparation method thereof and cooking appliance
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Solution Overview
Problem
Existing enamel compositions used in cooking appliances suffer from chipping defects due to thermal stress when subjected to high-temperature pyrolysis processes, which compromises their cleaning function and thermal shock resistance.
Innovation Solution
An enamel composition comprising glass frits, a siloxane-based compound, a silane-based compound, and mill additions such as SiO2, Al2O3, or TiO2, which helps in controlling bubble structures and reducing residual stress, thereby preventing chipping and enhancing thermal shock resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pyrolysis process is performed at high temperature (450-500°C) for cleaning contaminants, then cleaning function is improved, but thermal stress causes chipping defects on enamel surface
Solution Approach 1:
The patent modifies the chemical composition parameters of the enamel coating by incorporating specific glass frits with controlled softening points, siloxane-based compounds (0.1-2.5 wt%), and silane-based compounds (0.05-2.5 wt%). These compositional changes adjust the thermal expansion coefficient and stress distribution, allowing the enamel to withstand pyrolysis temperatures while preventing chipping defects.
Solution Approach 2:
The patent creates a composite enamel system combining glass frits as the base matrix with siloxane-based compounds and silane-based compounds as functional additives. This composite structure leverages the heat resistance of glass frits while the siloxane and silane compounds provide stress relief and thermal shock resistance, resolving the contradiction between high-temperature cleaning capability and structural integrity.
2Productivity
If enamel is used for pyrolysis cleaning at high temperature, then contaminant removal is improved, but residual stress from thermal expansion difference causes surface defects
Solution Approach 1:
The patent adjusts the chemical composition parameters to control thermal expansion behavior. By incorporating glass frits with specific softening characteristics and adding siloxane-based compounds (0.1-2.5 wt%) and silane-based compounds (0.05-2.5 wt%), the enamel's thermal expansion coefficient is optimized to match the substrate more closely, reducing residual stress and preventing surface defects during high-temperature pyrolysis cleaning.
3Reliability
If conventional enamel composition is used for high temperature application, then cleaning function is achieved, but enamel lifespan is reduced due to chipping defects
Solution Approach 1:
The patent develops a composite enamel formulation where glass frits form the heat-resistant base structure, while siloxane-based compounds (0.1-2.5 wt%) and silane-based compounds (0.05-2.5 wt%) create a flexible network that absorbs thermal stress. This composite architecture maintains cleaning functionality at high temperatures while significantly extending enamel lifespan by preventing chipping defects through superior stress management.
Solution Approach 2:
The siloxane-based and silane-based compounds act as preemptive stress buffers within the enamel matrix. Before thermal stress can cause chipping, these compounds are already positioned to absorb and distribute the stress, cushioning the enamel structure against damage during subsequent high-temperature pyrolysis cycles and thereby extending service life.
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 enamel composition ensures excellent cleaning functionality and thermal shock resistance, preventing chipping and extending the lifespan of the enamel without increasing costs, by using glass frits as raw material for mill additions.
Implementation Method 1
helps in controlling bubble structures and reducing residual stress, thereby preventing chipping and enhancing thermal shock resistance
Implementation Method 2
while temperature drops from high temperature to room temperature, 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
Implementation Method 3
the process of pyrolysis (thermal decomposition) by which contaminants are burned to ashes at high temperatures
Data Source
AI summary
An enamel composition for a cooking appliance is prepared by a preparation method. The enamel composition includes glass frits, a siloxane-based compound, a silane-based compound, and mill addition. The mill addition includes one or more materials 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.