YSZ Coating Composition for Thick, Defect-Free Electrolyte Layers
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Solution Overview
Problem
The existing methods for forming a yttria-stabilized zirconia layer on air electrode molded bodies are inefficient, requiring multiple dipping processes, leading to productivity issues, surface defects, and a rough coating that is prone to peeling.
Innovation Solution
A coating composition is developed using zirconium alkoxide, yttria compound, chelate compound, catalyst, water, and organic solvent, with yttria-stabilized zirconia fine particles added to enhance film thickness and reduce defects, allowing for a simpler and more efficient application method such as air spraying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple dipping operations are repeated to obtain a yttria-stabilized zirconia film with thickness of about 1 μm, then the desired film thickness is achieved, but productivity deteriorates due to the repetitive process
Solution Approach 1:
The invention changes the concentration parameters of the coating solution, specifically using a zirconium alkoxide concentration of 0.05 to 0.5 mol/L and a chelate compound concentration of 0.05 to 0.5 mol/L, which enables formation of a 1 μm thick yttria-stabilized zirconia film in a single dipping operation rather than requiring 20 repeated operations, thereby dramatically improving productivity while maintaining the desired film thickness
Solution Approach 2:
The invention incorporates a chelate compound into the coating solution before application, which preliminarily complexes with the zirconium alkoxide to control the hydrolysis rate. This preliminary chemical preparation allows the coating to form a dense, uniform structure in a single operation that would otherwise require multiple dipping cycles to achieve
2Ease of manufacture
If a coating film is formed by sol-gel reaction using zirconium alkoxide, then the coating can be formed with a simple method, but the hydrolysis rate is extremely fast causing defects such as cracks on the surface
Solution Approach 1:
The invention introduces a chelate compound as an intermediary substance that complexes with the zirconium alkoxide. This chelate acts as a mediator that moderates the extremely fast hydrolysis rate of zirconium alkoxide, allowing the sol-gel reaction to proceed at a controlled pace and form a uniform coating film without surface cracks or defects
Solution Approach 2:
The invention changes the chemical environment parameters by adding a chelate compound that alters the hydrolysis kinetics. The chelate compound concentration is controlled at 0.05 to 0.5 mol/L, which fundamentally changes the reaction rate parameters and allows simple single-step coating formation without the surface defects that would otherwise occur
3Manufacturing precision
If a coating film is formed to have a film thickness of 1 μm or greater, then the desired coating thickness is achieved, but the entire surface becomes scabrous and rough, and the coating film is easily peeled off
Solution Approach 1:
The invention changes the concentration parameters and chemical composition of the coating solution, using a zirconium alkoxide concentration of 0.05 to 0.5 mol/L combined with a chelate compound at 0.05 to 0.5 mol/L. These parameter changes enable formation of a 1 μm or greater thick coating in a single operation that maintains smooth surface quality and strong adhesion, preventing the scabrous appearance and peeling that occur with conventional methods
Solution Approach 2:
The chelate compound is preliminarily added to the coating solution to control the hydrolysis and condensation processes. This preliminary chemical preparation ensures that even at 1 μm or greater thickness, the coating forms with a smooth surface and strong bonding to the substrate, preventing the roughness and peeling defects that would otherwise occur
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 method enables the formation of a dense, defect-free yttria-stabilized zirconia layer with improved film thickness and reduced stress, enhancing the durability and smoothness of the coating, while simplifying the production process.
Implementation Method 1
the hydrolysis rate of the zirconium alkoxide is extremely faster than that of a common silicon alkoxide
Implementation Method 2
by using an air spray or the like
Data Source
AI summary
-- A coating composition enables film formation at low cost with a simple method by using a zirconium alkoxide and an yttrium compound as starting raw materials, and enables a dense yttria-stabilized zirconia layer to be obtained, The coating composition containing the zirconium alkoxide, the yttrium compound, a chelate compound, a catalyst, water, and an organic solvent is obtained. The coating composition may also contain yttria-stabilized zirconia fine particles