Cu-Sn-Ni-Zn Alloy Sheet for High Strength and Conductivity
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Solution Overview
Problem
Current high-strength copper alloys face challenges in balancing tensile strength, conductivity, bending workability, and corrosion resistance, with existing materials like beryllium copper posing health risks, phosphor bronze and nickel silver having poor productivity and economic inefficiencies, and brass lacking satisfactory strength and elongation.
Innovation Solution
A copper alloy sheet with a specific composition and manufacturing process involving cold finishing rolling, recrystallization, and thermal treatments to achieve miniaturized crystal grains, optimized with elements like Zn, Sn, P, Ni, Co, and Fe, resulting in improved tensile strength, conductivity, and stress relaxation characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If beryllium copper is used to achieve highest strength, then tensile strength is improved, but health safety and manufacturing cost worsen due to beryllium toxicity and expensive melting facilities
Solution Approach 1:
The patent removes beryllium from the alloy composition entirely, extracting the harmful element while maintaining high strength through alternative alloying elements (Sn, Ni, Zn, P) and controlled crystal grain structure (1.2-5.0 μm), thus eliminating health hazards while preserving mechanical properties
Solution Approach 2:
The patent replaces expensive beryllium copper with a more economical alloy system using common elements like Sn, Ni, and Zn that can be processed with standard manufacturing facilities, reducing both material cost and infrastructure investment while achieving comparable or superior performance
2Strength
If phosphor bronze or nickel silver is used to achieve high strength, then tensile strength is improved, but productivity and economic efficiency worsen due to poor hot workability and expensive manufacturing
Solution Approach 1:
The patent modifies the alloy composition parameters by adding specific ranges of Sn (1.0-3.0 mass%), Ni (0.5-2.0 mass%), Zn (3.0-15.0 mass%), and P (0.01-0.1 mass%) to create an alloy system that achieves high strength while maintaining excellent hot workability and cold workability, enabling efficient manufacturing through standard processes
Solution Approach 2:
The patent creates a composite alloy system combining multiple elements (Cu-Sn-Ni-Zn-P) that work synergistically: Sn and Ni provide strength through precipitation hardening, Zn improves ductility and hot workability, and P refines grain structure, resulting in an alloy that is both strong and easily manufacturable
3Strength
If phosphor bronze or nickel silver is used to achieve high strength, then tensile strength is improved, but manufacturing cost worsens due to expensive Sn and Ni content
Solution Approach 1:
The patent optimizes the concentration parameters of alloying elements to achieve cost-effectiveness: Sn is limited to 1.0-3.0 mass%, Ni to 0.5-2.0 mass%, while Zn is used in larger amounts (3.0-15.0 mass%) as it is more economical, creating a balanced composition that achieves high strength at reduced cost
Solution Approach 2:
The patent introduces Zn as an intermediary element that provides ductility and hot workability improvements at lower cost, allowing reduction of expensive Sn and Ni content while maintaining overall alloy performance through the combined effect of multiple elements working together
4Quantity of substance
If brass is used to achieve low cost, then manufacturing cost is improved, but strength and elongation worsen due to unsatisfactory mechanical properties
Solution Approach 1:
The patent transforms ordinary brass into a high-performance composite alloy by adding Sn (1.0-3.0 mass%) and Ni (0.5-2.0 mass%) to the Cu-Zn base, creating precipitation hardening phases that dramatically increase tensile strength and elongation while maintaining the cost-effectiveness of the brass system
Solution Approach 2:
The patent modifies the compositional parameters by introducing controlled amounts of strengthening elements (Sn, Ni) and microalloying elements (P, Co, Fe) into the brass system, changing the material properties from ordinary brass characteristics to high-strength copper alloy characteristics while maintaining economic viability
5Weight of moving object
If high-strength copper alloy is used to decrease sheet thickness, then weight is reduced, but conductivity worsens due to the inverse relationship between strength and conductivity
Solution Approach 1:
The patent changes the microstructural parameters by controlling crystal grain size (1.2-5.0 μm) and precipitation characteristics through specific alloying and heat treatment, achieving high strength that enables thinner sheets while maintaining adequate conductivity through optimized phase distribution and grain boundary characteristics
Solution Approach 2:
The patent creates a composite microstructure with dispersed precipitates (Sn, Ni, P phases) within the copper matrix that provide strengthening through precipitation hardening while maintaining good electrical conductivity through the continuous copper matrix pathway, resolving the strength-conductivity trade-off
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 copper alloy sheet exhibits enhanced tensile strength, proof stress, conductivity, bending workability, and stress corrosion cracking resistance, addressing the limitations of existing materials while ensuring economic efficiency and safety.
Implementation Method 1
a copper alloy sheet having been manufactured using a manufacturing process including a cold finishing rolling process in which a copper alloy material is cold-rolled
Implementation Method 2
round or oval precipitates are present in the copper alloy material, an average grain diameter of the precipitates is 4.0 nm to 25.0 nm
Data Source
Figure 1
AI summary
An aspect of the copper alloy sheet contains 5.0 mass% to 12.0 mass% of Zn, 1.1 mass% to 2.5 mass% of Sn, 0.01 mass% to 0.09 mass% of P and 0.6 mass% to 1.5 mass% of Ni with a remainder of Cu and inevitable impurities, and satisfies a relationship of 20≤[Zn]+7×[Sn]+15×[P]+4.5×[Ni]≤32. The aspect of the copper alloy sheet is manufactured using a manufacturing process including a cold finishing rolling process in which a copper alloy material is cold-rolled, the average crystal grain diameter of the copper alloy material is 1.2 µm to 5.0 µm, round or oval precipitates are present in the copper alloy material, the average grain diameter of the precipitates is 4.0 nm to 25.0 nm or a proportion of precipitates having a grain diameter of 4.0 nm to 25.0 nm in the precipitates is 70% or more.