Selective Braze Powder Printing for Complex Surface Bonding
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Solution Overview
Problem
Conventional methods for applying braze powders to complex or discontinuous surfaces in gas turbine engine components are inefficient, leading to waste and bonding issues, as they struggle to provide consistent coverage and are ineffective for irregular surfaces.
Innovation Solution
A printing method that selectively deposits braze powders at predetermined locations on a surface using an extruded filament comprising a flowable carrier and braze powder, allowing for precise deposition on metal alloy components with complex geometries, followed by diffusion bonding to form a monolithic component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If blanket surface coverage of braze alloys is applied, then coverage area is increased, but material waste increases and bonding quality deteriorates on complex surfaces
Solution Approach 1:
The patent applies selective braze powder deposition only at specific locations where bonding is required, rather than blanket coverage. The system uses a deposition head with controlled material application to place braze alloys precisely at predetermined locations on the surface, matching the actual bonding needs of complex geometries and eliminating waste on areas where braze material is not required.
Solution Approach 2:
The patent segments the braze application process into discrete, location-specific deposits rather than continuous blanket coverage. The deposition system applies material in separated zones corresponding to individual bonding interfaces, allowing precise control over where braze powder is placed and enabling adaptation to complex surface geometries without unnecessary material application.
2Quantity of substance
If conventional braze powder application methods are used, then material coverage is achieved, but deposition consistency deteriorates on irregular surfaces
Solution Approach 1:
The patent employs a dynamic deposition system where the deposition head can move relative to the workpiece in multiple axes, adjusting its position and orientation to maintain optimal deposition angles and distances on complex surfaces. This dynamic capability allows consistent braze powder application even on irregular geometries, as the system adapts its motion to match the surface topology.
Solution Approach 2:
The patent replaces conventional mechanical braze application methods (such as manual application or simple spraying) with a controlled deposition system that uses programmed motion and precise material delivery. This substitution enables consistent deposition patterns on complex surfaces by relying on automated control rather than manual technique, achieving uniformity despite surface irregularities.
3Reliability
If diffusion bonding is used to eliminate discontinuities, then bonding quality is improved, but process complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-positioning braze powder at specific locations before the diffusion bonding process. The selective deposition system places the necessary braze material in advance at the exact locations where bonding will occur, so that when diffusion bonding is performed, the material is already in optimal position. This preliminary preparation simplifies the overall process by eliminating the need for complex in-process adjustments during bonding.
Solution Approach 2:
The patent uses braze powder as an intermediary material to facilitate diffusion bonding between components. The selectively deposited braze powder acts as a mediator that enables metallurgical bonding at the interface, allowing the diffusion bonding process to achieve high-quality joints without requiring direct contact and perfect surface matching between the base components.
4Loss of substance
If selective braze powder deposition is implemented, then material efficiency is improved, but deposition process complexity increases
Solution Approach 1:
The patent implements a multi-functional deposition system that combines material delivery, positioning, and pattern control in a single integrated apparatus. The deposition head can perform multiple functions including precise material application, motion control along multiple axes, and adaptation to different surface geometries, thereby achieving selective deposition without requiring multiple separate systems and reducing overall process complexity.
Solution Approach 2:
The patent controls deposition parameters such as material flow rate, deposition speed, and head-to-surface distance to optimize the selective application process. By dynamically adjusting these parameters, the system achieves precise material placement with high efficiency while maintaining a relatively simple apparatus design, as parameter control is easier to implement than mechanical complexity.
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
This method enables efficient and consistent braze powder deposition on complex surfaces, reducing waste and improving bonding quality, resulting in a thermally stable, monolithic component with a homogeneous interface free of defects and porosity.
Implementation Method 1
extruding a filament from a nozzle moving relative to a surface, the filament comprising a flowable carrier mixed with a braze powder
Implementation Method 2
Diffusion bonding is a solid-state bonding method, where elevated temperatures and typically high pressures are employed to obtain diffusion of atoms between mating components
Data Source
AI summary
A printing method for selectively depositing braze powders on a surface comprises extruding a filament from a nozzle moving relative to a surface, where the filament comprises a flowable carrier mixed with a braze powder. As the nozzle moves, the filament is deposited on the surface in a predetermined pattern defined by the motion of the nozzle relative to the surface; thus, the braze powders are deposited at one or more predetermined locations on the surface.