Silver Brazing Alloy Composition for Low-Melting Narrow-Range Joining
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional silver brazing materials face challenges in reducing silver content while maintaining a low melting point and minimizing the temperature difference between solidus and liquidus temperatures, which affects workability and joint quality, and often have poor processability and wettability.
Innovation Solution
A silver brazing material with a silver content of 35-45 mass%, 18-25 mass% zinc, 2-6 mass% manganese, 1.5-6 mass% nickel, and 0.5-5 mass% tin, where the manganese to nickel ratio is optimized to generate an intermetallic compound that reduces the melting point and improves processability and wettability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the silver content of a silver brazing material is reduced, then the material cost is reduced, but the melting point tends to increase
Solution Approach 1:
The patent changes the compositional parameters by precisely controlling the silver content within 35-45 mass% and adding specific amounts of manganese (2-6 mass%) and nickel (1.5-6 mass%). This parameter optimization resolves the contradiction by achieving a melting point of 705°C or less while maintaining reduced silver content, preventing the melting point from increasing when silver is reduced.
Solution Approach 2:
The patent creates a composite alloy system combining silver, copper, zinc, manganese, and nickel in specific proportions. The interaction between these elements, particularly the formation of intermetallic compounds like Ag-Mn and Ag-Ni, produces a synergistic effect that maintains low melting point with reduced silver content, resolving the contradiction between silver reduction and melting point control.
2Ease of operation
If the temperature difference between solidus and liquidus is large, then the brazing material has wide processing range, but the workability decreases due to liquation
Solution Approach 1:
The patent optimizes the compositional parameters to control the solidus and liquidus temperatures. By adjusting silver content to 35-45 mass% and adding manganese (2-6 mass%) and nickel (1.5-6 mass%), the patent achieves a temperature difference of 50°C or less between solidus and liquidus. This resolves the contradiction by narrowing the processing range slightly while significantly improving workability and preventing liquation.
3Temperature
If the melting point of a silver brazing material is reduced, then the working temperature is lowered and energy cost is suppressed, but the temperature difference between solidus and liquidus may increase
Solution Approach 1:
The patent simultaneously optimizes multiple compositional parameters: silver content (35-45 mass%), zinc content (18-25 mass%), manganese (2-6 mass%), and nickel (1.5-6 mass%). This multi-parameter optimization achieves a melting point of 705°C or less while maintaining the temperature difference between solidus and liquidus at 50°C or less, resolving the contradiction between lowering working temperature and controlling temperature difference.
Solution Approach 2:
The patent introduces manganese and nickel as intermediary elements that mediate between silver and copper in the alloy system. These intermediary elements form intermetallic compounds that control the phase transformation temperatures, enabling the patent to achieve low melting point with controlled temperature difference, thus resolving the contradiction.
4Ease of manufacture
If conventional silver brazing materials are used, then the joining of copper and copper alloys is achieved, but the processability and wettability are poor
Solution Approach 1:
The patent optimizes the compositional parameters by adding manganese (2-6 mass%) and nickel (1.5-6 mass%) to the silver-copper-zinc base alloy. This compositional change improves both processability and wettability by controlling the microstructure and surface properties of the brazing material, resolving the contradiction between these two properties.
Solution Approach 2:
The patent introduces manganese and nickel as intermediary elements that improve the interaction between the brazing material and the base metals. These elements enhance wettability by modifying the surface chemistry and improve processability by controlling the flow characteristics of the molten brazing material, thus resolving the contradiction between processability and wettability.
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
The optimized composition achieves a melting point of 705°C or less, a temperature difference of 50°C or less between solidus and liquidus, and enhances processability and wettability, enabling efficient brazing with reduced energy costs and improved joint quality.
Implementation Method 1
the manganese to nickel ratio is optimized to generate an intermetallic compound that reduces the melting point
Implementation Method 2
achieves a melting point of 705°C or less
Implementation Method 3
the temperature difference between solidus and liquidus is small; a temperature difference of 50°C or less between solidus and liquidus
Data Source
AI summary
The present invention relates to a silver brazing material containing silver, copper, zinc, manganese, nickel, and tin as indispensable constituent elements. The silver brazing material includes 35 mass% or more and 45 mass% or less silver, 18 mass% or more and 28 mass% or less zinc, 2 mass% or more and 6 mass% or less manganese, 1.5 mass% or more and 6 mass% or less nickel, and 0.5 mass% or more and 5 mass% or less tin, with the balance being copper and unavoidable impurities. Then, within the above compositional ranges, a predetermined relation is set between the manganese content (CMn) and the nickel content (CNi), whereby the silver brazing material can be provided with excellent characteristics also in terms of processability or wettability. In the silver brazing material of the present invention, the silver content is reduced, and also melting point reduction and the narrowing of the temperature difference between solidus temperature and liquidus temperature are attempted.