Fluoride Spray Coating Adhesion via High-Velocity Inert Gas
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Solution Overview
Problem
Conventional fluoride spray coating methods using high-heat sources lead to thermal decomposition, oxidation reactions, and poor adhesion, resulting in unstable coatings with insufficient corrosion and plasma etching resistance, and inadequate adhesion to substrates.
Innovation Solution
A method involving the use of an inert gas at a relatively low temperature (600° C.-1300° C.) and high flying velocity (>500 m/sec) for fluoride particle deposition, with a carbide cermet undercoat layer and roughened substrate surface to enhance adhesion and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-heat source spraying method is used, then fluoride coating can be formed, but thermal decomposition and oxidation reactions occur causing poor adhesion and unstable coating
Solution Approach 1:
The patent uses an inert gas atmosphere (such as nitrogen or argon) during the spraying process to prevent oxidation reactions of the fluoride coating. The inert gas environment eliminates oxygen contact during coating formation, thereby preventing oxidation that would otherwise occur with high-heat source methods while still achieving proper coating adhesion and stability.
Solution Approach 2:
The patent modifies the temperature parameter of the spraying process by using a lower temperature heat source compared to conventional methods. This parameter change prevents thermal decomposition of the fluoride coating while maintaining sufficient heat for proper coating formation and adhesion to the substrate.
2Strength
If high flying velocity is used for fluoride particle deposition, then adhesion is improved, but coating uniformity may be compromised
Solution Approach 1:
The patent employs dynamic control of the spraying process by adjusting the flying velocity of fluoride particles to an optimal range. The system dynamically balances particle velocity to achieve sufficient adhesion strength while maintaining coating uniformity through controlled deposition conditions.
Solution Approach 2:
The patent applies local quality control by ensuring that the coating properties are optimized at different locations. The spraying process is controlled to achieve consistent adhesion and uniformity across the entire substrate surface, with particular attention to ensuring adequate adhesion at the coating-substrate interface while maintaining uniform thickness and composition throughout the coating layer.
3Reliability
If conventional spraying method is used, then coating formation is achieved, but corrosion resistance and plasma etching resistance are insufficient
Solution Approach 1:
The patent creates a composite coating structure consisting of fluoride particles embedded in a matrix material. This composite structure enhances both corrosion resistance and plasma etching resistance by combining the protective properties of fluoride with the structural integrity of the matrix, achieving superior performance while maintaining a relatively simple spraying process.
Solution Approach 2:
The patent applies preliminary surface treatment to the substrate before spraying the fluoride coating. This preliminary action includes surface cleaning and activation to ensure proper adhesion and to create a surface that enhances the subsequent corrosion and plasma etching resistance of the coating, thereby achieving better protective properties without complicating the overall manufacturing process.
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 produces a fluoride spray coating with improved adhesion, corrosion resistance, and plasma etching resistance, preventing thermal decomposition and oxidation, and ensuring a strong bond with the substrate.
Implementation Method 1
a fluoride spray coating which comprises a substrate and a fluoride spray coating formed on a surface of the substrate, characterized in that the fluoride spray coating has an implantation structure that at least a part of fluoride spraying particles bites into the substrate surface
Implementation Method 2
at least a part of fluoride spraying particles bites into the substrate surface
Data Source
AI summary
[Problem] To provide a fluoride spray coating covered member adhered with a fluoride spray coating having excellent properties on quality by suppressing a thermal decomposition reaction and an oxide reaction, and to propose a method for forming a cover by firmly adhering the coating.[Solution] A method for forming a fluoride spray coating in an implantation structure onto a substrate surface by spraying particles of a fluoride spraying material onto a substrate surface or a pretreated substrate surface, if necessary through an undercoat layer or spray particle dotted parts of carbide cermet, at a flying velocity of particles of not less than 500 m/sec with an inert gas as a working gas for coating formation at an inert gas temperature of 600° C.-1300° C. as well as a fluoride spray coating covered member.