Polysilazane Black Coating for Heat-Resistant Stainless Steel
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Solution Overview
Problem
Conventional organic material-based black coating compositions for home appliances suffer from carbonization, low surface hardness, and yellowing at high temperatures, leading to scratches and cracks.
Innovation Solution
A coating composition comprising polysilazane, solvent, and dark pigment, with specific weight percentages and particle sizes, is developed to provide heat resistance, transparency, and high hardness, preventing chemical changes and yellowing at temperatures up to 300°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an organic material-based black coating composition is used, then the coating can be applied to stainless steel surfaces, but the organic material carbonizes at high temperatures of 150°C or more
Solution Approach 1:
The patent changes the chemical composition parameters by replacing organic materials with inorganic polysilazane materials, fundamentally altering the material's thermal stability characteristics to withstand temperatures above 150°C without carbonization
Solution Approach 2:
The patent creates a composite coating system combining polysilazane binder with dark pigments (carbon black, graphite, or black TiO2) to achieve both the desired black color and high-temperature resistance, merging the advantages of different material classes
2Strength
If an organic material-based black coating composition is used, then the coating can be formed on stainless steel, but the surface hardness is low resulting in severe external scratches
Solution Approach 1:
The patent changes the material composition from organic to inorganic polysilazane-based coating, fundamentally improving the surface hardness parameter to resist external scratches while maintaining coating integrity
3Temperature
If an organic material-based black coating composition is used for cooktop or oven, then the coating can be applied, but yellowing occurs at high temperature and cracks are generated on the surface
Solution Approach 1:
The patent changes the chemical composition to polysilazane-based inorganic materials that maintain dimensional stability and color stability at high temperatures, preventing both yellowing and cracking that occur with organic materials
Solution Approach 2:
The patent formulates a composite coating with polysilazane binder and dark pigments that work synergistically to provide both color stability and structural integrity at high temperatures, preventing yellowing and crack formation
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 composition maintains chemical stability, prevents yellowing, and offers high hardness, ensuring durability and effective cleaning performance even at high temperatures.
Implementation Method 1
the coating composition of the present invention does not have a change in chemical structure at a high temperature of 200° C. or more, and preferably 300° C. or more
Implementation Method 2
a dispersant for improving the dispersibility of the dark pigment
Data Source
AI summary
A coating composition has heat resistance, transparency, and high hardness. The coating composition is configured to be applied to a stainless steel material. The coating composition includes a polysilazane, a solvent, a dark pigment and a dispersant. A home appliance includes a base including a stainless steel material and a coating layer disposed on the base. The coating layer includes the coating composition.