Solid Brazing Composition for Uniform Aluminum Heat Exchanger Coating
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Solution Overview
Problem
Conventional brazing compositions with solid fluxes face challenges in achieving uniform application due to their solid state, leading to inferior workability and increased complexity in production processes.
Innovation Solution
A brazing material comprising fluoride-based flux, a solidifying agent, and a coating film uniformity agent, which is solid at 25°C, improving coating uniformity by reducing interaction between components and allowing for easier application and crumbly texture, thereby enhancing the brazing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If solid flux is used to simplify the production line and improve workability, then the production process is simplified and workability is improved, but the coating uniformity becomes difficult to achieve
Solution Approach 1:
The invention uses a composite material system consisting of fluoride-based flux powder, solidifying agent powder, and coating film uniformity agent powder. This composite formulation combines the advantages of solid flux (ease of handling) with the benefits of uniform coating application, resolving the contradiction between workability and coating uniformity.
Solution Approach 2:
The invention changes the physical and chemical parameters of the brazing material by controlling particle size distribution (0.1-10 μm for uniformity agent), molecular weight (1000 or less), and crystallinity (full width at half maximum of 1° or more). These parameter adjustments enable the material to maintain solid state for easy handling while achieving uniform coating when applied.
2Manufacturing precision
If liquid flux is used for brazing, then the coating can be applied smoothly, but the flux flows and requires additional drying facilities
Solution Approach 1:
The invention changes the physical state parameter from liquid to solid by incorporating solidifying agents. The brazing material remains solid at room temperature for easy handling and uniform application, then melts at brazing temperature to provide smooth coating and flux action, eliminating the need for drying facilities.
Solution Approach 2:
The brazing material utilizes phase transition between solid and liquid states. It is solid at room temperature for convenient application without flowing, then transitions to liquid state at brazing temperature to enable smooth coating and effective flux action, resolving the contradiction between coating uniformity and production line complexity.
Data Source
AI summary
A brazing material for brazing aluminum or an aluminum alloy includes fluoride-based flux, a solidifying agent, and a coating film uniformity agent, and is solid at 25° C.