Boron-Doped Diamond Coating for Thermal Integrity
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Solution Overview
Problem
Boron-doped diamond materials degrade under extreme temperatures and oxidizing conditions, leading to failure in intended applications due to lack of corrosion resistance and thermal integrity.
Innovation Solution
A metal-coated article is formed by electroplating a refractory metal region onto a boron-doped diamond substrate, followed by a platinum-group metal coating, creating a refractory metal carbide layer and a platinum-group metal layer to enhance thermal conductivity, electrical conductivity, and corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If boron-doped diamond materials are used at extreme temperatures, then thermal conductivity is improved, but structural integrity deteriorates due to degradation and oxidation
Solution Approach 1:
The patent applies composite materials by creating a multi-layer coating structure comprising a refractory metal carbide layer (e.g., tungsten carbide) and a refractory metal layer (e.g., tungsten) deposited on the boron-doped diamond substrate. This composite structure combines the high thermal conductivity of the diamond substrate with the oxidation resistance and structural stability of the refractory metal carbide and metal layers, allowing the article to maintain both thermal performance and structural integrity at extreme temperatures
Solution Approach 2:
The patent applies local quality by providing different functional layers at different locations of the article. The refractory metal carbide layer is positioned at the interface with the harsh environment to provide oxidation resistance, while the refractory metal layer provides structural support. This spatial differentiation of material properties allows the article to simultaneously achieve thermal conductivity near the diamond substrate and corrosion/oxidation resistance at the surface exposed to extreme conditions
2Reliability
If refractory metal coating is applied to enhance corrosion resistance, then reliability under corrosive conditions is improved, but manufacturing complexity increases due to multiple deposition steps
Solution Approach 1:
The patent applies merging by combining multiple functional requirements into a unified coating system. The electroplating process simultaneously deposits both the refractory metal carbide layer and the refractory metal layer in a coordinated sequence, creating a multi-functional coating that provides adhesion, oxidation resistance, and structural stability. This integrated approach achieves complex protective functionality while maintaining a relatively streamlined manufacturing process compared to applying separate coatings for each function
3Reliability
If platinum-group metal coating is applied to improve oxidation resistance, then reliability in oxidizing conditions is improved, but manufacturing cost increases
Solution Approach 1:
The patent applies local quality by providing oxidation resistance only where most needed - at the outer surface of the refractory metal layer that is exposed to oxidizing environments. The platinum-group metal coating is applied selectively as a thin outer layer on the refractory metal, concentrating the expensive oxidation-resistant material only at the interface with the harsh environment rather than throughout the entire article structure, thereby reducing overall material cost while maintaining protective functionality
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 metal-coated article provides improved thermal and electrical conductivity while maintaining structural integrity under high-temperature, corrosive conditions, reducing carbon footprints and extending the lifespan of boron-doped diamond materials.
Implementation Method 1
A refractory metal is deposited from a functional electrolyte in an alkali halide auxiliary electrolyte bath, onto the boron-doped diamond substrate to form a refractory metal layer
Implementation Method 2
A portion of the refractory metal layer is converted to a refractory metal carbide layer while a portion of the refractory metal layer remains an unreacted refractory metal
Implementation Method 3
A platinum-group metal is deposited from a functional electrolyte in an alkali halide auxiliary electrolyte bath, onto the refractory metal layer to form a platinum-group metal layer
Implementation Method 4
converting a portion of the platinum-group metal layer to a platinum-group metal, refractory metal transition layer between the platinum-group metal layer and the refractory metal layer
Data Source
AI summary
A metal coated article includes a platinum-group metal region adjacent a refractory metal region, which is adjacent a substrate comprising an inorganic material. A refractory metal carbide layer is adjacent the substrate and the refractory metal layer is adjacent the refractory metal carbide layer. The platinum-group metal region comprises a refractory metal/platinum-group metal layer and a platinum-group metal layer. Related methods are also disclosed.