Presintered Powder Metal Brazing in H2-N2 Atmospheres
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Solution Overview
Problem
Conventional brazing processes for powder metal components often require additional steps and additives, such as endothermic gases and methane dosing, which complicate the process, increase manufacturing costs, and lead to unwanted oxidation, while existing methods fail to achieve sufficient reducing potential with standard H2-N2 atmospheres.
Innovation Solution
A method involving the compacting of powdered metal into pellets, presintering at 316°C - 649°C, and joining metal components using these pellets in a H2-N2 atmosphere without the need for additional additives, where the pellets are selected from metals like iron, copper, nickel, and molybdenum, and manufactured through a copper infiltration process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If endothermic gases or methane dosing are used to achieve stronger reducing potential, then oxidation resistance is improved, but process complexity and manufacturing costs increase
Solution Approach 1:
The invention extracts and removes the unnecessary additives (endothermic gases, methane dosing) from the brazing process. By using a standard H2-N2 atmosphere without additional reducing agents, the process eliminates the complexity of delivering and controlling these additives while still achieving adequate oxidation resistance for the brazing operation.
Solution Approach 2:
The brazing process becomes self-sufficient by relying on the inherent reducing capability of the standard H2-N2 atmosphere. The system does not require external assistance from additional gases or dosing mechanisms, as the standard atmosphere provides sufficient reducing potential when combined with proper brazing technique and filler metal selection.
2Object-affected harmful factors
If endothermic gases or methane dosing are added to the brazing process, then oxidation resistance is improved, but manufacturing costs increase
Solution Approach 1:
The invention removes the expensive additives (endothermic gases, methane dosing equipment) from the process. By demonstrating that a standard H2-N2 atmosphere is sufficient for brazing operations, the patent eliminates the need for costly gas delivery systems, dosing equipment, and associated control mechanisms, thereby reducing manufacturing costs while maintaining adequate oxidation resistance.
3Object-affected harmful factors
If additional steps and compositions are added to achieve stronger reducing potential, then oxidation resistance is improved, but the brazing process becomes more complex and error-prone
Solution Approach 1:
The invention extracts the unnecessary process steps and additive compositions from the brazing procedure. By using a standard H2-N2 atmosphere without additional reducing agents, the process eliminates multiple potential failure points associated with delivering, controlling, and monitoring these additives, thereby improving overall process reliability and reducing the likelihood of errors.
4Object-affected harmful factors
If additional components are added to the brazing system, then reducing potential is improved, but waste and scrap increase
Solution Approach 1:
The invention removes the additional components (endothermic gases, methane dosing) from the brazing system. By demonstrating that these additives are unnecessary for achieving successful brazing results in a standard H2-N2 atmosphere, the patent eliminates the waste and scrap associated with these unused or partially consumed materials, thereby improving material efficiency and reducing environmental impact.
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 simplifies the brazing process, reduces oxidation, and achieves stronger metallurgic joints with increased breaking strength, as demonstrated by the comparison of presintered and non-presintered samples, with presintered joints showing nearly twice the average break strength.
Implementation Method 1
heating the combination of the first and second metal components containing the presintered pellets until the presintered pellets melt and join the metal components to form a metallurgic joint
Implementation Method 2
The brazing process may occur in a H2-N2 atmosphere
Implementation Method 3
presintering the pellets at a temperature of 316°C - 649°C (600° F - 1200° F)
Implementation Method 4
The powdered metal may be manufactured by a copper infiltration process
Data Source
Figure 1
Figure 2A~2D
Figure 3A~3B
AI summary
The present application describes an article having a first metal component joined to a second metal component by a metallurgic joint of presintered powdered metal interposed between contiguous surfaces of the first metal component and the second metal component. The present application also describes a composition for use in a brazing process comprising a presintered powdered metal. The present application also describes a process for brazing including the following steps: presintering a powdered metal; adding the presintered powdered metal to a first and second metal component; and heating the combination of the first and second metal components containing the presintered powdered metal until the powdered metal melts and joins the metal components to form a metallurgic joint.