Refractory Metal Plating via Nitride Intermediary Layer
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Solution Overview
Problem
Refractory metals like tungsten and tungsten alloys cannot be electroplated, making it difficult to produce plated articles such as jewelry with metals like gold or platinum.
Innovation Solution
A method involving a substrate coated with a metallic nitride or boride, followed by an external metallic coating, using physical vapor deposition or chemical vapor deposition, allowing for electroplating on refractory metals like tungsten carbide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electroplating is used to coat a substrate with a thin layer of metal, then the process is simple and cost-effective, but it cannot be applied to refractory metals such as tungsten, molybdenum, niobium, tantalum or rhenium
Solution Approach 1:
The patent introduces an intermediary layer (first coating) between the refractory metal substrate and the external metallic coating. This intermediate layer serves as a mediator that enables the plating process to work on refractory metals by providing a surface that can be coated, thereby resolving the incompatibility between electroplating and refractory metal substrates
Solution Approach 2:
The patent applies a preliminary coating (metallic nitride or metallic boride) to the refractory metal substrate before applying the external metallic coating. This preliminary action prepares the substrate surface to accept the external coating, enabling the plating process to proceed on materials that would otherwise be incompatible with traditional plating methods
2Adaptability or versatility
If a coating is applied to refractory metals to enable plating, then versatility is improved, but the process complexity increases due to multiple coating steps
Solution Approach 1:
The patent changes the chemical composition and properties of the substrate surface by converting it to a metallic nitride or metallic boride coating. This parameter change transforms the refractory metal surface into a form that is compatible with external metallic coating deposition, enabling versatility while managing process complexity through controlled material transformation
3Reliability
If multiple coatings are applied to achieve both adhesion and aesthetic appearance, then coating performance is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent creates a composite coating structure with two distinct layers: a first coating of metallic nitride or metallic boride for adhesion and substrate protection, and an external metallic coating for aesthetic appearance and additional functionality. This composite approach improves overall coating performance by combining the advantages of different materials while managing the complexity through a systematic multi-layer design
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 surface resistant to deformation and wear while retaining the color of the external coating, enabling the production of jewelry and other articles that would otherwise be impossible to plate using traditional electroplating.
Implementation Method 1
depositing the first coating onto the substrate by physical vapor deposition or chemical vapor deposition
Implementation Method 2
depositing the first coating onto the substrate by physical vapor deposition or chemical vapor deposition
Data Source
AI summary
Provided is a jewelry ring comprising a substrate, a first coating of a metallic nitride or a metallic boride, and an external metallic coating. Also provided is a metallic article comprising a substrate comprising tungsten carbide, cobalt, tungsten, titanium, titanium carbide, zirconium, tantalum or aluminum; a first coating of a metallic nitride or a metallic boride; and an external metallic coating. A method for making a jewelry ring comprising a substrate, a first coating of a metallic nitride or a metallic boride, and an external metallic coating is additionally provided. Further provided is a method for making a metallic article comprising a substrate comprising tungsten carbide, cobalt, tungsten, titanium, titanium carbide, zirconium, tantalum or aluminum; a first coating of a metallic nitride or a metallic boride; and an external metallic coating.