Heating appliance covered with a self-cleaning coating and production method thereof
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Solution Overview
Problem
Existing heating appliance coatings, such as those for iron soleplates and cooking appliances, face challenges with fouling and contamination from organic dirt, requiring high amounts of platinoid oxides for effective self-cleaning, which increases costs without ensuring complete satisfaction in terms of catalytic activity, shiny appearance, glide, and resistance to abrasion.
Innovation Solution
A self-cleaning coating comprising a metal support with a combination of platinoid oxides and rare earth oxides, where the rare earth oxides act as dopants to enhance catalytic activity, reducing the amount of platinoid oxides needed while maintaining or improving the coating's properties, including catalytic activity, adhesion, and resistance to abrasion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high amount of platinoid oxides is used in the coating, then catalytic activity is improved, but cost increases significantly
Solution Approach 1:
The patent changes the chemical composition parameters of the coating by introducing rare earth oxides (such as cerium oxide, neodymium oxide, praseodymium oxide) as dopants. This substitution modifies the catalytic properties, allowing achieving the same or better catalytic activity with significantly reduced platinoid oxide content, thus resolving the contradiction between catalytic activity and material quantity/cost
Solution Approach 2:
The patent creates a composite coating material combining platinoid oxides with rare earth oxides. This composite structure leverages the synergistic effects between the two oxide types, where rare earth oxides enhance the catalytic performance and reduce the required amount of expensive platinoid oxides, effectively addressing both catalytic activity and cost concerns
2Ease of operation
If the coating maintains shiny appearance and glide properties, then ease of operation is improved, but resistance to fouling deteriorates
Solution Approach 1:
The patent applies different functional properties to different aspects of the coating: the rare earth oxide dopants provide catalytic activity for self-cleaning against fouling, while the overall coating structure maintains smooth surface characteristics for glide. This local differentiation of functions allows the coating to simultaneously achieve ease of operation and fouling resistance
Solution Approach 2:
The catalytically active coating continuously oxidizes organic dirt particles that land on the surface, maintaining cleanliness without interrupting the glide function. The self-cleaning action operates continuously during ironing, preventing fouling accumulation while preserving the smooth surface needed for easy ironing
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 achieves three to five times greater catalytic activity with two to four times less platinoid oxides, ensuring the surface remains clean by oxidizing and detaching organic particles, and maintains excellent glide and abrasion resistance, thus reducing maintenance and operational costs.
Implementation Method 1
the rare earth oxides act as dopants to enhance catalytic activity
Implementation Method 2
the coating achieves three to five times greater catalytic activity with two to four times less platinoid oxides, ensuring the surface remains clean by oxidizing and detaching organic particles
Data Source
Figure 1~4
Figure 5~8
AI summary
The present invention relates to a heating appliance (1) including a metal substrate (2), at least a part of which is covered with a self-cleaning coating including at least one oxidation catalyst selected from the platinoid oxides, and at least one dopant of said oxidation catalyst selected from the rare-earth oxides. According to the invention, the self-cleaning coating (4) is a bilayer coating including: an inner layer (3) at least partially covering the metal substrate (2) and including the dopant; and an outer layer (4) in contact with the ambient air and including the oxidation catalyst. The present invention also relates to a method for producing such a heating appliance.