Localised Diffusion Coating via Protective Gas Jet
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Solution Overview
Problem
Existing methods for preventing unwanted diffusion layers on metallic components, such as turbine blades, are inefficient and costly, particularly in areas with internal cooling channels, where protective arrangements like powder packs are difficult to install and remove.
Innovation Solution
A method using a directed protective gas jet, concentrated through a nozzle device and guided through cavities in the component, to interrupt transport processes and prevent diffusion layer formation, combined with a reactor design that allows easy operation and low-cost removal of protective arrangements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protective arrangements such as powder packs are used to prevent unwanted diffusion layers on component areas with internal cooling channels, then protection against diffusion layer formation is improved, but the ease of installation and removal deteriorates significantly
Solution Approach 1:
The patent applies pneumatic principles by using a gas jet (inert gas or reducing gas) to protect areas with internal cooling channels from unwanted diffusion layer formation. The gas jet is directed through the cooling channels to create a protective atmosphere, eliminating the need for physical protective arrangements like powder packs that are difficult to install and remove.
Solution Approach 2:
The patent uses an inert gas or reducing gas to create a protective atmosphere within the internal cooling channels. This inert environment prevents the formation of unwanted diffusion layers by excluding reactive gases, providing reliable protection without requiring physical barriers that would complicate installation and removal.
2Reliability
If a directed protective gas jet is used to prevent diffusion layer formation on specific areas, then protection effectiveness is improved, but the device complexity increases due to the need for nozzle devices and gas supply systems
Solution Approach 1:
The patent makes the internal cooling channels serve a dual function: their original cooling function plus a protective function by introducing gas jets through the same channels. This multi-functionality eliminates the need for separate protective arrangements, reducing overall device complexity while maintaining protection effectiveness.
Solution Approach 2:
The patent utilizes the existing internal cooling channel structure of the component to deliver the protective gas jet directly to the areas requiring protection. The component's own geometry is leveraged to guide the protective gas, eliminating the need for external nozzle devices and reducing system complexity.
3Reliability
If conventional protective methods are used on turbine blades with internal cooling channels, then some protection is achieved, but the cost of installation and removal increases considerably
Solution Approach 1:
The patent replaces expensive physical protective arrangements (powder packs, separating layers) with a gas jet system that can be easily introduced and removed through the internal cooling channels. This pneumatic approach significantly reduces the cost and complexity of installation and removal operations.
Solution Approach 2:
The patent uses an inert or reducing gas atmosphere to provide protection, which can be easily introduced and removed without the need for expensive physical protective materials. This approach eliminates the costs associated with installing and removing complex protective arrangements while maintaining reliable protection.
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
Effectively prevents diffusion layer formation on non-coated areas with minimal effort and cost, allowing for efficient production of locally limited diffusion layers on metallic components, including turbine blades with internal cooling channels.
Implementation Method 1
Diffusion layers, in which metals such as aluminum, silicon or chromium are diffused into the surface area of a metallic component
Implementation Method 2
the diffusion method taking place by means of gas phase deposition
Data Source
Figure 1
AI summary
The method involves arranging metallic component (2) and dispensing package (3) comprising a to-be-diffused material. A protective gas beam which does not flow around the region of metallic component in which diffusion layer is to be formed is made to flow on metallic component. The metallic component and the dispensing package are heated to a temperature for carrying out the diffusion. The temperature is maintained for a certain time. An independent claim is included for reactor.