Refractory Metal Oxycarbide Coating for Vivid Color and Durability
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Solution Overview
Problem
Current methods for coating brass articles and similar materials are labor-intensive due to complex shapes and result in coatings that lack durability, being susceptible to acids and not providing adequate wear, abrasion, and corrosion resistance while also failing to achieve desired decorative appearances like vivid primary colors.
Innovation Solution
A multi-layer coating comprising refractory metal oxycarbide and oxide layers with specific oxygen and carbon content ratios is applied, including a first layer of refractory metal oxycarbide with 20-35 atomic percent oxygen, a second layer with higher oxygen content, and a top refractory metal oxide layer, deposited using techniques like electroplating and vapor deposition to achieve decorative and protective properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional buffing and polishing operations are performed on complex-shaped brass articles, then a high gloss surface is achieved, but the manufacturing process becomes labor intensive and complex
Solution Approach 1:
The patent replaces mechanical buffing and polishing operations with a PVD coating process that deposits refractory metal oxycarbide layers. This substitution eliminates labor-intensive mechanical operations while achieving the desired surface quality and decorative appearance through controlled material deposition.
Solution Approach 2:
The patent applies a preliminary PVD coating layer before final decorative coating. This preliminary layer provides a uniform base surface that eliminates the need for extensive mechanical buffing and polishing, as the coating process itself creates the necessary surface uniformity and gloss.
2Reliability
If organic protective coatings are applied to polished surfaces, then some protection is provided, but the coatings lack durability and are susceptible to acid attack
Solution Approach 1:
The patent uses composite refractory metal oxycarbide materials containing both oxygen and carbon in specific ratios. This composite material structure provides enhanced durability, wear resistance, and chemical resistance to acid attack, overcoming the limitations of traditional organic coatings.
Solution Approach 2:
The patent changes the chemical composition parameters by controlling oxygen and carbon content in the PVD coating process. By adjusting these parameters to create oxycarbide layers with specific stoichiometric ratios, the coating achieves superior chemical resistance and durability compared to conventional organic coatings.
3Ease of manufacture
If conventional coating methods are used, then some decorative appearance is achieved, but vivid primary colors like red, yellow, and blue cannot be obtained
Solution Approach 1:
The patent changes the oxygen-to-carbon ratio parameter in the PVD coating process to produce different colors. By controlling these compositional parameters, vivid primary colors (red, yellow, blue) and green can be achieved through refractory metal oxycarbide layers, expanding the decorative color range beyond conventional coatings.
Solution Approach 2:
The patent directly produces color changes in the coating material itself through compositional control rather than relying on pigments or dyes. The refractory metal oxycarbide layers exhibit inherent colors based on their oxygen and carbon content, enabling vivid primary colors to be achieved through the coating composition and structure.
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 solution provides durable wear, abrasion, and corrosion resistance while achieving vivid color appearances such as red, yellow, blue, and green, enhancing the aesthetic and protective qualities of coated articles.
Implementation Method 1
deposited using techniques like electroplating and vapor deposition
Implementation Method 2
deposited using techniques like electroplating and vapor deposition
Data Source
AI summary
An article is coated with a coating having a vivid primary color. In a preferred embodiment, the coating comprises a nickel or polymer basecoat layer, and a first color layer comprised of oxygen-rich refractory metal oxycarbides, a second color layer comprising oxygen-rich refractory metal oxycarbides and a top layer of refractory metal oxides.