Remote Crucible Joining of High-Melting Fillers Without Substrate Heat Damage
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Solution Overview
Problem
Existing methods for joining high melting temperature filler materials to substrate materials often cause thermal damage and mechanical property degradation due to radiant heat, and lower melting temperature filler materials may not provide adequate high-temperature performance.
Innovation Solution
A method and system that melts the filler material in a crucible at a remote distance from the substrate, using a pressure differential to control the flow through a nozzle, allowing for the delivery of a continuous molten stream without excessive heat transfer to the substrate, thereby maintaining the substrate's mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high melting temperature filler material is used, then high temperature performance is improved, but thermal damage to substrate material occurs due to radiant heat
Solution Approach 1:
The system separates the melting function from the deposition function by using multiple nozzles: a first nozzle receives and melts filler material, while a second nozzle delivers the molten material to the substrate. This segmentation allows the high-temperature melting process to be spatially separated from the substrate, preventing thermal damage while maintaining high melting temperature filler material benefits.
Solution Approach 2:
A carrier gas acts as an intermediary medium to transport molten filler material from the melting zone through a transfer passage to the deposition nozzle. The carrier gas protects the molten material from oxidation and enables controlled delivery without direct radiant heat exposure to the substrate, resolving the contradiction between high melting temperature and substrate thermal damage.
2Ease of manufacture
If radiant heat is applied to melt filler material, then filler material can be applied to substrate, but substrate mechanical properties deteriorate due to heat impingement
Solution Approach 1:
The system divides the manufacturing process into distinct stages: melting occurs in a first nozzle away from the substrate, followed by controlled delivery through a second nozzle. This segmentation enables filler material application while protecting substrate mechanical properties by eliminating direct radiant heat impingement on the substrate.
Solution Approach 2:
The system replaces traditional radiant heat-based melting and application with a controlled fluid delivery system using carrier gas and pressure differentials. This substitution allows precise control of molten material delivery without the thermal field that would compromise substrate strength, maintaining ease of manufacture while protecting mechanical properties.
3Object-affected harmful factors
If lower melting temperature filler material is used, then less heat is applied to substrate, but high temperature performance and mechanical properties deteriorate
Solution Approach 1:
By separating the melting zone (first nozzle) from the deposition zone (second nozzle), the system enables use of high melting temperature filler materials without transferring excessive heat to the substrate. The spatial segmentation allows the filler material to achieve its full high-temperature performance potential while the substrate experiences minimal thermal exposure.
4Speed
If high pressure is applied to deliver molten filler material, then delivery speed increases, but filler material may be drawn upstream causing flow instability
Solution Approach 1:
The system dynamically adjusts pressure differentials at different locations: higher pressure in the second nozzle for rapid delivery, and lower pressure in the first nozzle to prevent upstream drawing. This dynamic pressure management enables high-speed delivery while maintaining flow stability through adaptive control.
Solution Approach 2:
Different pressure conditions are applied at different locations within the system: the first nozzle operates under lower pressure to maintain stable melting and prevent upstream drawing, while the second nozzle operates under higher pressure for rapid delivery. This local differentiation of pressure quality enables both speed and stability simultaneously.
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 approach reduces thermal shock and mechanical failures, eliminates melt contaminations, and enables the use of high melting temperature filler materials without compromising the substrate's integrity, resulting in joints with mechanical properties similar to the substrate material.
Implementation Method 1
an induction heating element operatively connected to the crucible for heating the filler material within the melting chamber of the crucible to melt the filler material
Implementation Method 2
a pressurized gas source propels the molten metal mass through the crucible orifice in a continuous stream
Data Source
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AI summary
A method is provided for joining a filler material to a substrate material. The method includes melting the filler material within a melting chamber of a crucible such that the filler material is molten. The crucible has an outlet fluidly connected to the melting chamber. The method also includes holding the filler material within the melting chamber of the crucible by applying a first pressure differential across the outlet of the crucible, and releasing the filler material from the melting chamber of the crucible by applying a second pressure differential across the outlet of the crucible to deliver the filler material to a target site of the substrate material. The second pressure differential has a different value than the first pressure differential.