Brazing Paste Composition for Direct Application and Stable Joining
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Solution Overview
Problem
Pelletized brazing materials have limited workability and require a recess for application, restricting their use in joining metal members effectively.
Innovation Solution
A paste-like brazing material comprising 80-95% brazing material, 5-20% binder, with a flux containing boric acid or borax, and solvents like 2,5-dimethyl-2,5-hexanediol and terpineol, which allows for high workability and direct application to joining parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pelletized brazing materials are used, then the brazing material can be applied to join metal members, but the workability is low and a recess is required for application
Solution Approach 1:
The invention changes the physical state of the brazing material from pelletized form to paste form. This parameter change eliminates the need for recesses and improves workability while maintaining the brazing function. The paste formulation with specific binder and solvent ratios enables direct application on flat surfaces.
Solution Approach 2:
The invention creates a composite brazing paste by combining brazing material (80-95% by mass) with a specifically formulated binder system (5-20% by mass). The binder contains solid solvents with 8-10 carbon atoms and liquid solvents, creating a composite material that maintains Brazing material integrity while enabling paste formulation for improved workability.
2Reliability
If the binder contains solid solvent with 8-10 carbon atoms, then the paste achieves high workability and stable joining, but the formulation complexity increases
Solution Approach 1:
The invention specifies precise parameter ranges for the solid solvent (8-10 carbon atoms, two or more hydroxyl groups) to optimize paste performance. This parameter control ensures high workability and joining stability while the systematic formulation approach manages complexity through defined composition ranges.
Solution Approach 2:
The invention formulates a composite binder system combining solid solvents (with specific carbon atom counts and hydroxyl groups) and liquid solvents in defined ratios. This composite approach balances workability, stability, and formulation manageability through systematic material combination rather than single-component systems.
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 stable and efficient joining of metal parts with improved processing accuracy and yield, enabling miniaturization and simplified applications, even in mass production.
Implementation Method 1
the binder may contain a solid solvent containing two or more hydroxyl groups and having 8 to 10 carbon atoms, and a liquid solvent
Implementation Method 2
a paste-like brazing material which can achieve high workability
Implementation Method 3
the brazing material may contain a flux in an amount of 2% by mass or more and 5% by mass or less, the binder may contain a solid solvent containing two or more hydroxyl groups and having 8 to 10 carbon atoms
Implementation Method 4
a brazing material that has been melted and become liquid enters a slight gap between an inner peripheral surface of the opening and the outer peripheral surface of the pipe member due to a capillary phenomenon
Data Source
AI summary
A brazing paste contain a brazing material in an amount of 80% by mass or more and 95% by mass or less; and a binder in an amount of 5% by mass or more and 20% by mass or less. The brazing material contains a flux in an amount of 2% by mass or more and 5% by mass or less. The binder contains a solid solvent containing two or more hydroxyl groups and having 8 to 10 carbon atoms, and a liquid solvent. When the binder does not contain a thixotropic agent, the liquid solvent is contained in an amount of 68% by mass or more with respect to a total of the binder, and when the binder contains a thixotropic agent, the thixotropic agent is contained in an amount of 11% by mass or less with respect to a total of the binder.