Microplasma Spray Coating Turbine Vanes Without Masking
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Solution Overview
Problem
Conventional plasma spray coating methods for turbine vanes are large, non-portable, and require masking due to wide spray patterns, making them unsuitable for accurate, field-based repairs and lacking in precision for localized coating without dedicated facilities.
Innovation Solution
A microplasma spray apparatus with a microplasma gun featuring an anode, cathode, and arc generator, which uses inert arc gas to create a plasma gas stream for localized coating of turbine vanes without masking, allowing for hand-held operation and precise application of powdered materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional plasma spray coating equipment is used, then coating material can be applied to turbine vanes, but the equipment is large and non-portable requiring dedicated facilities
Solution Approach 1:
The conventional large plasma spray equipment is segmented into a compact microplasma gun that can be handheld. The system divides the coating application into localized areas that can be treated sequentially, enabling portability while maintaining coating capability.
Solution Approach 2:
The essential plasma generation and coating application functions are extracted from the large dedicated facility equipment and concentrated into a small handheld gun, removing the need for complex facility infrastructure while preserving the core coating functionality.
2Manufacturing precision
If conventional plasma spray coating is used, then coating can be applied to turbine vanes, but the spray pattern is too wide to accurately control the coating process
Solution Approach 1:
The microplasma gun produces a highly concentrated, narrow plasma jet that delivers coating material to a very small localized area on the turbine vane. This allows precise control of where the coating is applied without affecting surrounding areas, achieving high manufacturing precision.
Solution Approach 2:
The spray pattern is transformed from a wide two-dimensional area coverage to a focused narrow beam that can be precisely positioned in three-dimensional space, allowing accurate targeting of specific locations on the turbine vane surface.
3Manufacturing precision
If conventional plasma spray coating is used, then turbine vanes can be coated, but masking is required in areas where material transfer is not desired
Solution Approach 1:
The microplasma gun's highly focused plasma jet enables coating to be applied only to the specific localized area that requires treatment. The narrow spray pattern inherently limits material transfer to the target zone, eliminating the need for masking surrounding areas and simplifying the overall process.
4Adaptability or versatility
If conventional plasma spray coating equipment is used, then coating can be applied, but the equipment cannot be used for field repairs outside manufacturing facilities
Solution Approach 1:
The coating capability is extracted from the controlled manufacturing facility environment and embodied in a self-contained handheld device. This extraction enables the equipment to operate autonomously in field conditions without requiring dedicated facility infrastructure, supporting repairs outside the manufacturing plant.
Solution Approach 2:
The microplasma gun is designed as a universal tool that can perform coating applications in multiple environments - both in manufacturing facilities and in field conditions. The device's portability and self-sufficiency give it multi-functional adaptability across different operational contexts.
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
Enables accurate, unmasked coating of turbine vanes in the field with reduced heat input and localized stress, eliminating the need for masking and dedicated facilities, while maintaining high precision and control over the coating process.
Implementation Method 1
A microplasma gun includes an anode, cathode, and an arc generator for generating an electric arc between the anode and cathode
Implementation Method 2
The electric arc is operable for ionizing the gas to create a plasma gas stream
Implementation Method 3
A powder injector injects powdered material into the plasma gas stream. The turbine vane can be coated in a localized area with the powdered material
Data Source
AI summary
A method and apparatus for microplasma spray coating a portion of a turbine vane without masking any portions thereof. The apparatus includes a microplasma gun with an anode, cathode, and an arc generator for generating an electric arc between the anode and cathode. An arc gas emitter injects gas through the electric arc. The electric arc is operable for ionizing the gas to create a plasma gas stream. A powder injector injects powdered material into a plasma stream. A localized area of the turbine vane is coated with the powdered material without having to mask the turbine vane.