Champagne Gold Alloy Composition for Affordable Jewelry Casting
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Solution Overview
Problem
Existing gold alloys for jewelry are expensive due to high gold content and lack variety in color options, particularly for achieving champagne-colored shades.
Innovation Solution
A copper-containing gold alloy with specific compositions (58.5-58.7% gold, 26.9-32.6% copper, 5.7-10.7% silver, 1.0-3.0% palladium, and 0.7-2.2% zinc) that allows for a champagne-colored jewelry body, produced cost-effectively through the use of Cu63Zn37 brass to introduce zinc, and can be cast by hand or via continuous casting for various jewelry pieces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high gold content is used in jewellery alloys, then the jewellery quality and value are improved, but the production cost increases significantly
Solution Approach 1:
The patent changes the compositional parameters of the gold alloy by precisely controlling the ranges of gold (58.5-58.7 wt.%), copper (26.9-32.6 wt.%), silver (5.7-10.7 wt.%), palladium (1.0-3.0 wt.%), and zinc (0.7-2.2 wt.%). This parameter optimization maintains jewellery quality while reducing production costs through improved workability and reduced material waste.
Solution Approach 2:
The patent creates a composite gold alloy combining multiple metals (gold, copper, silver, palladium, zinc) in specific proportions. This composite material achieves both cost-effectiveness and quality by leveraging the complementary properties of each metal, particularly the workability enhancement from copper and zinc combinations.
2Stability of the object's composition
If traditional gold alloy compositions are used, then the material properties are stable, but the color variations are limited
Solution Approach 1:
The patent applies local quality by assigning specific functional roles to different alloying elements: copper (26.9-32.6 wt.%) and zinc (0.7-2.2 wt.%) specifically contribute to champagne coloration, while silver (5.7-10.7 wt.%) and palladium (1.0-3.0 wt.%) provide structural stability. This localized functional distribution enables both color versatility and material stability.
Solution Approach 2:
The patent achieves color variation through controlled composition changes, specifically utilizing copper and zinc content adjustments to produce champagne-colored gold alloys. The precise copper-to-zinc ratio control within the specified ranges enables consistent champagne coloration while maintaining material stability.
3Ease of manufacture
If copper content is increased to reduce cost, then the production cost decreases, but the workability of the alloy deteriorates
Solution Approach 1:
The patent merges copper (26.9-32.6 wt.%) and zinc (0.7-2.2 wt.%) in specific proportions to create a synergistic effect. This combination improves workability through zinc's lubricating effect during forming operations while copper provides cost reduction and coloration benefits, resolving the contradiction between cost and workability.
Solution Approach 2:
The patent optimizes the copper content parameter within the range of 26.9-32.6 wt.% and combines it with zinc at 0.7-2.2 wt.%. This parameter control ensures sufficient copper for cost-effectiveness and coloration while zinc content is maintained at levels that preserve workability, preventing excessive brittleness.
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 a novel champagne color shade with improved workability and affordability, enabling the production of affordable, high-quality jewelry with intricate designs.
Implementation Method 1
the zinc content of the alloy is at least partially obtained by melting brass together with the other constituents
Data Source
AI summary
A piece of jewelry having a copper-containing gold alloy consists of 58.5 to 58.7 wt. % gold, 26.9 to 32.6 wt. % copper, 5.7 to 10.7 wt. % silver, 1.0 to 3.0 wt. % palladium, and a remainder containing 0.7 to 2.2 wt. % zinc.