3D Precious Metal Decoration on Non-Conductive Surfaces
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Solution Overview
Problem
Decorations applied to non-conductive materials like ceramics and sapphire suffer from weak adhesion, leading to detachment or peeling, especially on stressed components such as watch bezels.
Innovation Solution
A method involving electroforming and laser contouring to create a thick relief decoration with multiple bonding layers, ensuring secure adhesion of noble metal or its alloy to the substrate, including deposition, laser cutting, and protective layer application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single bonding layer is used to attach decoration to non-conductive substrate, then the manufacturing process is simple, but the adhesion strength is insufficient leading to detachment
Solution Approach 1:
The bonding layer is segmented into multiple distinct layers (first bonding layer and second bonding layer) with different compositions and functions. The first bonding layer provides initial adhesion to the non-conductive substrate, while the second bonding layer enhances adhesion strength and provides a suitable surface for electroforming, thereby resolving the contradiction between adhesion strength and structural complexity.
Solution Approach 2:
The bonding structure uses composite materials with different properties - the first bonding layer typically comprises a metal or alloy optimized for adhesion to ceramics/sapphire, while the second bonding layer comprises a different metal or alloy optimized for electroforming compatibility. This composite approach achieves superior overall adhesion strength while maintaining manageable complexity.
2Strength
If a thick layer of precious metal is deposited by electroforming, then the decoration has solid appearance and durability, but the material consumption increases
Solution Approach 1:
The electroforming process is applied preliminarily over the second bonding layer before final decoration steps, creating a thick, durable precious metal base layer that provides both structural integrity and solid appearance. This preliminary thick deposition ensures durability while the subsequent precision laser contouring minimizes further material consumption by removing only excess material at edges.
Solution Approach 2:
The electroforming parameters (current density, deposition time, electrolyte composition) are optimized to achieve the desired thickness and quality of precious metal deposition efficiently. By controlling these parameters, the process achieves maximum durability with minimum precious metal consumption, resolving the contradiction between durability and material loss.
3Manufacturing precision
If precision laser contouring is used to delimit decoration edges, then the manufacturing precision is high, but the manufacturing complexity increases
Solution Approach 1:
Traditional mechanical cutting or masking methods are replaced with precision laser contouring, which uses optical energy to precisely delimit decoration edges. This substitution achieves superior manufacturing precision for complex geometries while the laser system, though advanced, integrates seamlessly into the existing electroforming and deposition equipment, managing overall device complexity.
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 method provides a durable and secure attachment of noble metal decorations, preventing detachment and enhancing durability against wear and tear.
Implementation Method 1
Electroforming deposition of a layer of the precious metal or its alloy onto the second bonding layer
Implementation Method 2
Laser contouring of the precious metal or its alloy layer to delimit the relief decoration
Data Source
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AI summary
A method for manufacturing an article (1) made of a non-electrically conductive material, the article (1) comprising at least one raised decoration (2a) made of a precious metal or its alloy, the method comprising the steps of: - Deposition of a first tack coat (4a) and a second tack coat (4b) on the surface (2) of a blank (3); - Electroforming deposition of a layer of the precious metal or its alloy (5) onto the second tack coat (4b); - Laser cutting of the layer of precious metal or its alloy (5) to delimit the raised decoration (2a); - Deposition of a protective layer (7) around the perimeter of the raised decoration (2a); - Removal of the layer of precious metal or its alloy (5) from portions (2c) not covered by the protective layer (7); - Removal of the protective layer (7); - Removal of the first tack coat (4a) and possibly the second tack coat (4b) on the portions (2c).