Cathodic Arc Deposition for Hole Edge Coating
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Solution Overview
Problem
Cathodic arc deposition methods often result in inadequate coatings on the edges of holes in machine components, leading to oxidation distress and reduced durability due to insufficient thickness and porosity.
Innovation Solution
A method and system for cathodic arc deposition that positions panels relative to a target surface at a specific deposition angle, emitting a source material as both vapor and liquid particles to ensure dense, consistent coatings on edges and surfaces, using an oxidation-resistant MCrAIY-type material and electrically charging the cathodic arc and panel to attract the material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cathodic arc deposition is used to coat panel surfaces, then coating efficiency and productivity are improved, but coating quality on hole edges deteriorates due to inadequate thickness and porosity
Solution Approach 1:
The patent applies different coating approaches to different regions of the panel. The vapor cloud coating method is specifically targeted at hole edges where dense coating is critical, while the liquid particle stream coats the broader panel surfaces. This localized differentiation ensures that the most vulnerable areas (hole edges) receive the most appropriate coating treatment for oxidation resistance.
Solution Approach 2:
The coating process is segmented into two distinct components: a vapor cloud component and a liquid particle stream component. These segmented components are delivered to the panel simultaneously but serve different functions - the vapor cloud provides conformal coating on complex geometries like hole edges, while the liquid particles provide bulk material deposition on flat surfaces.
2Ease of manufacture
If conventional cathodic arc deposition processes are used, then manufacturing simplicity is maintained, but coating density and oxidation resistance deteriorate on hole edges
Solution Approach 1:
The patent modifies key process parameters including the deposition angle (positioning the panel at a specific angle relative to the target surface), the ratio of vapor cloud to liquid particle delivery, and the electrical charging parameters. These parameter changes transform the conventional single-mode cathodic arc process into a dual-mode process that achieves both hole edge coverage and surface coating quality.
Solution Approach 2:
The coating system uses a composite approach by combining two different material delivery states (vapor and liquid particles) in a single deposition process. This composite delivery method ensures that the coating material can adapt to different surface geometries and provides both conformal coverage on edges and dense material deposition on surfaces.
3Reliability
If coating thickness on hole edges is increased to prevent oxidation, then oxidation resistance improves, but coating porosity increases and coating quality deteriorates
Solution Approach 1:
The patent maintains continuous coating deposition on hole edges through the vapor cloud mechanism, which can conformally coat complex geometries without interruption. The continuous presence of vapor material ensures that even in recessed areas and on vertical edge surfaces, a consistent coating layer is formed without the porosity issues that arise from intermittent or spray-based application methods.
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 provides dense, oxidation-resistant coatings with consistent microstructure and density on edges and surfaces, preventing oxidation distress and enhancing the durability of machine components, particularly in high-temperature applications like gas turbine engine combustor panels.
Implementation Method 1
cathodic arc deposition of a source material that coat edges associated with the surface
Implementation Method 2
cathodic arc deposition generally refers to physical vapor deposition techniques in which a cathode, composed of the coating source material, is vaporized
Implementation Method 3
providing a cathodic arc, the cathodic arc including a target surface... emitting the source material from the target surface
Data Source
AI summary
A method for depositing a coating of a source material onto a panel is disclosed. The method includes providing a cathodic arc, the cathodic arc including a target surface, the target surface disposed along a target deposition axis and able to emit the source material as a generally cloud of source material vapor and a generally conical stream of liquid particles of the source material. The method further includes positioning the panel relative to the target surface based on a deposition angle, the deposition angle being between the target surface and an outer limit of the generally conical stream of liquid particles o the source material. The method may further include emitting the source material from the target surface as the generally conical cloud of source material vapor and coating the edge with the cloud of source material vapor to provide an edge coating.