Copper-Tin Multi-Alloy Bronze with Hard Phases
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Solution Overview
Problem
Current copper-tin alloys lack sufficient cold formability, strength, hardness, temperature resistance, and corrosion resistance, particularly in wear-stressed components, and are prone to porosity and dendrite formation, which affects their toughness and wear resistance.
Innovation Solution
A copper-tin multi-component bronze alloy with a composition of 0.5 to 14.0% Sn, 0.01 to 8.0% Zn, 0.01 to 0.8% Cr, 0.05 to 2.0% Al, 0.01 to 2.0% Si, and optional Mn and P, featuring precipitated Cr-containing and Al-containing silicides surrounded by a tin film, produced through chill or continuous casting, which reduces dendrite formation and enhances strength, hardness, and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional copper-tin alloys are used to improve wear resistance, then hardness and strength increase, but cold formability deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters by adding specific elements (Cr: 0.01-0.8%, Mn: 0.01-2.0%, Al: 0.05-2.0%, Si: 0.01-2.0%, Zn: 0.01-8.0%, P: 0-0.08%, S: 0-0.08%) to the copper-tin alloy system. These compositional changes enable the formation of a refined microstructure with dispersed hard phases that provide strength while maintaining matrix ductility for cold formability
Solution Approach 2:
The invention creates a composite microstructure consisting of a copper-tin matrix reinforced with dispersed hard phases (intermetallic compounds and silicides). This composite structure provides the strength and hardness needed for wear resistance while the matrix maintains sufficient ductility for cold forming operations
2Strength
If alloy elements are added to improve strength and hardness, then wear resistance improves, but porosity and dendrite formation increase
Solution Approach 1:
The invention optimizes the concentration parameters of alloying elements to prevent excessive dendrite formation. By controlling the content of Cr, Mn, Al, Si, Zn, P, and S within specific ranges, the alloy achieves a balanced microstructure that provides strength enhancement without excessive porosity or dendritic segregation
Solution Approach 2:
The invention creates local quality variations in the microstructure through controlled dendritic growth and phase distribution. The alloying elements create localized regions of different phases (α-phase, δ-phase, intermetallic compounds) that are strategically distributed to provide strength while minimizing defect formation
3Strength
If tin content is increased to improve wear resistance, then hardness increases, but cold formability decreases
Solution Approach 1:
The invention changes the tin content parameter within an optimized range (improving wear resistance through adequate tin levels) while compensating with other alloying elements (Cr, Mn, Al, Si, Zn) that provide alternative mechanisms for hardness enhancement without the detrimental effects of excessive tin on cold formability
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 exhibits improved cold formability, high strength, hardness, and resistance to abrasive and adhesive wear, with reduced porosity and enhanced toughness, making it suitable for wear protection layers and components in mechanical engineering.
Implementation Method 1
silicides and/or chromium particles are precipitated in the microstructure
Implementation Method 2
produced through chill or continuous casting
Data Source
AI summary
Copper-tin multicomponent bronze comprises: tin (0.5-14 wt.%); zinc (0.01-8 wt.%); chromium (0.01-0.8 wt.%); aluminum (0.05-2 wt.%); silicon (0.01-2 wt.%); optionally manganese (0.1-3 wt.%); optionally phosphorus (up to a maximum of 0.08 wt.%); optionally sulfur (up to a maximum of 0.08 wt.%); and residues of copper and unavoidable impurities. An independent claim is included for producing strips, plates, bolts, wires, rods, tubes and profiles of the copper-tin multicomponent bronze using the diecasting process or the continuous or semicontinuous extrusion casting process.