Self-Bonding Aluminum Alloy via Internal Liquid Phase
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Solution Overview
Problem
The existing methods for bonding aluminum alloy materials, such as those used in heat exchangers, often require brazing filler metals, which increase costs and can lead to deformation issues, especially when using single-layer materials.
Innovation Solution
A novel bonding method utilizing an aluminum alloy with specific compositions of Si and Fe, generating a liquid phase during heating to bond the material without external filler metals, maintaining shape and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If brazing filler metals are used for bonding aluminum alloy materials, then strong bonding can be obtained in a short time, but the cost increases and deformation issues occur
Solution Approach 1:
The invention extracts and eliminates the brazing filler metal from the bonding process. By developing an aluminum alloy with specific composition (Si: 1.0-5.0 mass%, Fe: 0.01-2.0 mass%) that generates liquid phase internally during heating, the patent removes the need for external bonding materials, thereby reducing cost while maintaining bonding capability
Solution Approach 2:
The aluminum alloy material is designed to bond itself without external assistance. The specific alloy composition enables the material to generate its own liquid phase during heating, allowing self-bonding at the interface without requiring brazing filler metals, fluxes, or other external bonding agents
2Strength
If brazing filler metals are used for bonding aluminum alloy materials, then strong bonding can be obtained in a short time, but deformation of the material occurs
Solution Approach 1:
The invention creates local liquid phase generation at the bonding interface through specific alloy composition design. The Si and Fe content is optimized to ensure liquid phase forms locally at the interface during heating, providing bonding strength without causing global deformation of the entire component
Solution Approach 2:
The patent changes the chemical composition parameters of the aluminum alloy (specifically Si: 1.0-5.0 mass% and Fe: 0.01-2.0 mass%) to control the phase transformation behavior. This parameter adjustment enables the material to generate liquid phase at a controlled temperature range, achieving bonding while maintaining dimensional stability
3Ease of manufacture
If single-layer aluminum alloy material is used, then cost is reduced by eliminating clad layers, but bonding performance deteriorates without brazing filler metal
Solution Approach 1:
The single-layer aluminum alloy material is designed to perform the bonding function itself through controlled liquid phase generation. The specific composition enables the material to create its own bonding mechanism internally, eliminating the need for additional clad layers or external filler metals while maintaining effective bonding performance
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 method allows for efficient bonding of aluminum alloy structural bodies without deformation and reduces costs by eliminating the need for brazing filler metals, maintaining the size and shape of the material.
Implementation Method 1
generating a liquid phase during heating to bond the material without external filler metals
Data Source
AI summary
Aluminum alloy material containing Si: 1.0 to 5.0 mass % and Fe: 0.01 to 2.0 mass % with balance being Al and inevitable impurities, wherein 250 pcs/mm2 or more to 7×105 pcs/mm2 or less of Si-based intermetallic compound particles having equivalent circle diameters of 0.5 to 5 μm are present in a cross-section of the aluminum alloy material, while 100 pcs/mm2 or more to 7×105 pcs/mm2 or less of Al-based intermetallic compound particles having equivalent circle diameters of 0.5 to 5 μm are present in a cross-section of the aluminum alloy material. An aluminum alloy structure is manufactured by bonding two or more members in vacuum or a non-oxidizing atmosphere at temperature at which a ratio of a mass of a liquid phase generated in the aluminum alloy material to a total mass of the aluminum alloy material is 5% or more and 35% or less.