Brazing Paste Composition for Direct Joint Surface Application
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Solution Overview
Problem
Conventional pelletized brazing materials have limited workability, requiring a recess for application and restricting their use scenarios due to their solid form.
Innovation Solution
A paste-like brazing material comprising 80-95% brazing material and 5-20% binder, where the binder contains a solid solvent with two or more hydroxyl groups and a liquid solvent, optionally with a thixotropic agent, allowing for improved workability and wetting without the need for boric acid and borax.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pelletized brazing materials are used, then joining can be performed, but workability is low and a recess is required for application
Solution Approach 1:
The patent changes the physical state of the brazing material from solid pellets to a paste form by adjusting parameters such as composition (adding binder with solid and liquid solvents) and consistency. This allows the material to be applied directly to joint surfaces without requiring recesses, thereby improving workability while eliminating the need for additional structural features for material placement
2Adaptability or versatility
If pelletized brazing materials are used, then joining can be performed, but use scenes are limited
Solution Approach 1:
By changing the physical form parameter from solid pellets to paste, the invention expands the range of applicable joining scenarios. The paste form can be applied to various surface geometries and joint configurations that would be difficult or impossible to access with pelletized materials, thereby increasing adaptability to different use scenes while improving ease of operation
3Ease of manufacture
If a recess is provided for pelletized brazing material, then the material can be placed, but the structure becomes more complex
Solution Approach 1:
The invention extracts and eliminates the requirement for a recess structure by changing the brazing material form to paste. The paste can be applied directly to the joint surfaces without needing a dedicated placement structure, thereby simplifying the overall device structure while maintaining ease of material placement and application
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 paste-like brazing material achieves high workability, enabling direct application, stable joining quality, and easier assembly of smaller parts, with improved processing accuracy and yield, suitable for mass production.
Implementation Method 1
a solid solvent containing two or more hydroxyl groups
Implementation Method 2
a liquid solvent
Implementation Method 3
when the binder contains a thixotropic agent
Data Source
AI summary
A brazing paste contain 80% by mass or more and 95% by mass or less of a brazing material; and 5% by mass or more and 20% by mass or less of a binder. The binder contains a solid solvent containing two or more hydroxyl groups and having 5 to 7 carbon atoms, and a liquid solvent.