Copper Alloy Composition for Laser Cladding Wear and Weldability
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Solution Overview
Problem
Copper-based alloys used in laser cladding on aluminum substrates face challenges with low weldability and insufficient wear resistance, requiring high output and low speed laser cladding to improve weldability, which is not optimal for maintaining wear resistance.
Innovation Solution
A copper-based alloy composition including Cu, Ni, Si, Fe, Mg, and at least one of Mo, W, or V, with a minimum 0.02% Mg content, enhancing weldability and wear resistance by destroying surface oxides and acting as a matrix strengthening element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If laser cladding is performed on aluminum alloy substrate with conventional copper-based alloy, then wear resistance can be maintained, but weldability is low requiring high output and low speed laser cladding
Solution Approach 1:
The patent changes the chemical composition parameters of the copper-based alloy by adding specific amounts of Mg (0.01-5 mass%), Ni (5-30 mass%), Si (0.5-5 mass%), Fe (2-20 mass%), and other elements. This parameter modification enables the alloy to achieve both good weldability on aluminum substrates and sufficient wear resistance, resolving the contradiction between ease of manufacture and strength.
Solution Approach 2:
The patent creates a composite copper-based alloy system that combines multiple elements (Cu-Ni-Si-Fe-Mg-Mo/W/V) to achieve properties that cannot be obtained with conventional single-element or simple alloy compositions. This composite material approach allows simultaneous improvement of weldability and wear resistance.
2Ease of manufacture
If high output and low speed laser cladding is used to improve weldability, then deposition efficiency decreases, but weldability improves
Solution Approach 1:
By modifying the alloy composition parameters (adding Mg, Ni, Si, Fe in specific ranges), the patent enables laser cladding to be performed at higher speeds and lower outputs while maintaining good weldability. This reverses the conventional trade-off, allowing both high deposition efficiency and good weldability to be achieved simultaneously.
3Strength
If chromium content is reduced to less than 1.0% to improve wear resistance through oxide film formation, then oxide film forms more readily, but weldability may be affected
Solution Approach 1:
The patent reduces chromium content to less than 1.0 mass% while compensating with additions of Mg, Ni, Si, and Fe to maintain overall alloy performance. This parameter adjustment allows oxide film formation for wear resistance while the other elements ensure good weldability is maintained.
Solution Approach 2:
The patent uses a multi-element composite approach where the combined effects of Mg, Ni, Si, Fe, and low Cr content create an alloy system that achieves both wear resistance through oxide film formation and good weldability, compensating for the reduced chromium content.
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 alloy achieves excellent weldability and maintains sufficient wear resistance, improving deposition efficiency and wear resistance while maintaining mechanical strength, as demonstrated by tests showing reduced wear and increased tensile strength.
Implementation Method 1
when Mg is added in a specific amount or more, it is possible to maintain wear resistance and further improve the weldability with respect to a substrate
Implementation Method 2
Mg: 0.02 mass % to 5.0 mass %. In the first aspect, the remainder may include Cu and inevitable impurities
Data Source
AI summary
A copper-based alloy which includes Cu, Ni, Si, Fe, and Mg, and at least one selected from the group consisting of Mo, W, and V, and in which a content of Mg is 0.02 mass % or more. The copper-based alloy exhibits wear resistance and improved weldability with respect to a substrate.