Hydrophilic Steam Chamber Coating for Leidenfrost and Flaking Control
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Solution Overview
Problem
Existing steam promoter coatings in steam generating devices, such as steam irons, are either too viscous or too brittle, leading to issues with the Leidenfrost effect and flaking in humid and high-temperature environments, which affects the efficiency of steam generation.
Innovation Solution
A hydrophilic coating comprising an acid phosphate compound and boron, preferably with a metallic salt, is applied to the steam chamber, enhancing steaming performance by reducing the Leidenfrost effect and improving mechanical strength, allowing for easier application and thicker coatings without flaking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a steam promoter coating based largely on mono aluminum phosphates alone is used, then the coating is less viscous and easier to apply, but the coating becomes too brittle and can only be applied in small thicknesses less than one micron
Solution Approach 1:
The patent applies composite materials by combining mono aluminum phosphate with at least one other inorganic compound (such as silica, alumina, or zirconia) to create a coating that maintains both ease of application and sufficient strength. This composite approach allows the coating to be applied in thicknesses greater than one micron while remaining free from flaking, resolving the contradiction between applicability and mechanical strength.
2Strength
If a coating with higher filler content is used to improve mechanical strength, then the coating becomes more resistant to flaking, but the coating mixture becomes highly viscous and cannot be readily applied by spraying techniques
Solution Approach 1:
The patent applies parameter changes by carefully controlling the ratio and particle size distribution of fillers in the coating mixture. By optimizing these parameters, the coating achieves adequate mechanical strength and resistance to flaking while maintaining a viscosity level that allows for ready application by spraying techniques, thus resolving the contradiction between strength and applicability.
3Ease of manufacture
If a thin coating layer is applied to reduce brittleness, then the coating is easier to apply, but the risk of occurrence of the Leidenfrost effect increases
Solution Approach 1:
The patent uses composite materials to create a coating that can be applied in optimal thicknesses (greater than one micron) without flaking. This enables the coating to effectively suppress the Leidenfrost effect while maintaining ease of application, resolving the contradiction between application ease and steam generation reliability.
4Reliability
If a coating with high filler content is used, then the coating provides better steam promoter properties, but the coating flakes break away in humid and high-temperature environments
Solution Approach 1:
The patent applies composite materials by combining mono aluminum phosphate with other inorganic compounds that provide both steam promoter properties and environmental stability. This composite structure prevents flaking in humid and high-temperature environments while maintaining effective steam generation, resolving the contradiction between performance and compositional stability.
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 coating effectively shifts the Leidenfrost effect to higher temperatures, promotes good wetting and water spreading, and provides improved mechanical strength and adhesion, ensuring efficient steam generation without flaking or thermal conduction limitations.
Implementation Method 1
By virtue of the hydrophilic character of the steam promoter coating, the water introduced spreads readily over the surface of the steam chamber. A suitable steam promoter coating offers a combination of good wetting, absorption of water into the porous structure
Implementation Method 2
When some water touches the surface, the surface is immediately cooled down effectively to below Leidenfrost effect temperatures
Data Source
Figure 1
AI summary
The invention relates to a steam generating device comprising a steam chamber provided with a hydrophilic coating. The hydrophilic coating comprises an acid phosphate compound and boron, preferably a salt of boron with a metallic element. The coating promotes steaming and is resistant to flaking. The invention also relates to a method of producing the hydrophilic coating in the steam chamber of a steam generating device, and to an iron comprising the steam generating device.