Ni-Mg Bonding Alloy for Aluminum-Steel Interfaces
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Aluminum materials face challenges in bonding with non-aluminum metals like steel, copper, and titanium due to the formation of fragile intermetallic compounds, which degrades bondability and requires precise diffusion annealing conditions, limiting their use in applications such as power modules and structural components in vehicles.
Innovation Solution
An Ni—Mg alloy with a specific magnesium content is developed, which enhances pressure weldability, diffusion bondability, and brazability to both non-aluminum metals and aluminum, reducing the growth of intermetallic compounds and maintaining bonding strength by reducing aluminum oxide at the interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aluminum is directly bonded to non-aluminum metals such as steel, copper, or titanium, then bonding can be achieved, but fragile intermetallic compounds form which degrade bondability and require precise diffusion annealing conditions
Solution Approach 1:
The patent introduces an Ni-Mg alloy layer as an intermediary between aluminum and non-aluminum metals. This intermediate layer prevents direct contact between aluminum and metals like steel, copper, or titanium, thereby avoiding the formation of fragile intermetallic compounds while maintaining good bondability to all materials involved.
Solution Approach 2:
The patent modifies the chemical composition parameters of the bonding layer by specifying an Ni-Mg alloy with Mg content of 0.08-0.90 mass%. This parameter change in alloy composition alters the diffusion behavior and intermetallic compound formation characteristics, enabling broader and more relaxed diffusion annealing conditions while maintaining bonding reliability.
2Reliability
If an aluminum layer and nickel layer are directly bonded together, then excellent bondability is achieved, but Al-Ni intermetallic compounds grow excessively which significantly degrades bondability
Solution Approach 1:
The Ni-Mg alloy serves as a modified intermediary layer between aluminum and nickel. The magnesium component in the alloy controls the diffusion rate and intermetallic compound growth, preventing excessive Al-Ni intermetallic formation while maintaining the excellent bondability characteristics of the Al-Ni system.
Solution Approach 2:
By adjusting the Mg content in the nickel-based alloy to 0.08-0.90 mass%, the patent optimizes the diffusion characteristics and intermetallic compound formation kinetics. This parameter modification allows the system to maintain good bondability while suppressing excessive intermetallic growth that would otherwise degrade bonding strength.
3Reliability
If aluminum and copper are diffusion-bonded together, then bonding can be achieved, but a highly fragile intermetallic compound is produced which prevents direct bonding
Solution Approach 1:
The Ni-Mg alloy layer acts as an intermediary between aluminum and copper, preventing direct Al-Cu contact and the formation of highly fragile Al-Cu intermetallic compounds. The alloy maintains good bondability to both aluminum and copper while avoiding the formation of brittle compounds at the interface.
4Reliability
If pressure welding and diffusion bonding are used to bond aluminum to non-aluminum metals, then bonding can be achieved, but the process requires precise control of diffusion annealing conditions to prevent excessive intermetallic compound growth
Solution Approach 1:
The patent specifies an Ni-Mg alloy with Mg content of 0.08-0.90 mass%, which modifies the diffusion characteristics and intermetallic compound formation kinetics. This parameter optimization enables the bonding process to proceed under broader and more relaxed diffusion annealing conditions, reducing manufacturing complexity while maintaining bonding quality.
Solution Approach 2:
The Ni-Mg alloy intermediate layer simplifies the manufacturing process by decoupling the bonding interface from direct Al-non-aluminum metal contact. This intermediary structure allows for more flexible and less precise control of diffusion annealing parameters while still achieving reliable bonds without excessive intermetallic growth.
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 Ni—Mg alloy ensures robust bonding between aluminum and non-aluminum metals, improving the durability of clad materials and composite materials used in electronic components and structural components without degrading bonding strength at elevated temperatures.
Implementation Method 1
maintaining bonding strength by reducing aluminum oxide at the interface
Implementation Method 2
bonding an aluminum layer to a copper layer excellent in heat conductivity to each other through an iron layer or a nickel layer by means of pressure welding and diffusion bonding
Implementation Method 3
bonding an aluminum layer to a copper layer excellent in heat conductivity to each other through an iron layer or a nickel layer by means of pressure welding and diffusion bonding
Implementation Method 4
The aluminum cooler and the aluminum layer of the heat-diffusion facilitating layer are brazed together
Data Source
AI summary
An aluminum bonding alloy is an Ni—Mg alloy for bonding aluminum and a non-aluminum metal selected from steel, copper, nickel or titanium. The Ni—Mg alloy consists essentially of 0.08-0.90 mass % Mg, and the balance of Ni and inevitable impurities. A clad material includes a non-aluminum metal layer made of the non-aluminum metal and a bonding alloy layer made of the aluminum bonding alloy. The non-aluminum metal layer and the bonding alloy layer are bonded together by pressure welding and diffusion bonding.