Light Gold Copper Alloy Fastener with Zinc Nickel Composition
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Solution Overview
Problem
Conventional metallic fastener materials struggle to achieve a specific gold color while maintaining high strength, discoloration resistance, and workability, as existing solutions often result in peeling plating and increased costs, and are not practical for diverse design requirements.
Innovation Solution
A copper alloy with specific compositions of Zn and Ni, ranging from 1 to 30% Zn and 1 to 11% Ni, is used to achieve a light gold color, high strength, and discoloration resistance, eliminating the need for plating and ensuring durability and aesthetic appeal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If plating is applied to achieve gold color, then color requirement is satisfied, but plated film peels off due to friction during fastener operation
Solution Approach 1:
The invention extracts and eliminates the plated film layer from the fastener structure, using the base copper alloy material itself to provide the gold color through controlled composition (Cu-10-30 Zn-10-20 Ni) and heat treatment, rather than relying on a separate plating layer that is prone to peeling
Solution Approach 2:
The invention changes the compositional parameters of the base copper alloy material and applies heat treatment to achieve the desired gold color directly in the substrate, transforming the approach from surface coating to bulk material property modification
2Strength
If conventional copper alloys are used to achieve high strength, then strength requirement is satisfied, but discoloration occurs during long-term use
Solution Approach 1:
The invention uses a composite copper alloy system combining Cu, Zn, and Ni in specific proportions, where the synergistic interaction between these elements provides both high strength through solid solution strengthening and superior corrosion resistance that prevents discoloration during long-term use
3Shape
If plating solutions are used to achieve desired color, then color requirement is satisfied, but manufacturing cost increases
Solution Approach 1:
The invention replaces expensive plating materials and complex plating processes with a cost-effective copper alloy base material that achieves the desired gold color through composition control and heat treatment, eliminating the need for additional plating layers and reducing manufacturing costs
4Shape
If copper alloy composition is adjusted to achieve light gold color, then color requirement is satisfied, but strength may be compromised
Solution Approach 1:
The invention optimizes the compositional parameters within specific ranges (Zn: 10-30%, Ni: 10-20%) and applies heat treatment parameters to achieve both the desired light gold color and high strength, demonstrating that proper parameter selection can simultaneously satisfy both color and strength requirements
Solution Approach 2:
The invention employs a composite copper-zinc-nickel alloy system where the interaction between multiple elements provides both aesthetic color properties and mechanical strength, avoiding the need to compromise strength for color appearance
Data Source
AI summary
A metallic fastener member has a specific color of light gold and also has high strength, discoloration resistance and high workability to withstand practical use. A metallic fastener member including a base material of a copper alloy having composition containing 1 to 30% by mass of Zn and 1 to 11% by mass of Ni, the balance being Cu and inevitable impurities, wherein the metallic fastener member has a Vickers hardness of Hv 120 or more and less than Hv 220.