Nanocrystalline Diamond Coating on Gemstones via Slurry Deposition
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Solution Overview
Problem
Existing methods for depositing diamond coatings on gemstones and other substrates face challenges such as the need for high temperatures, which can cause damage or color change, and the difficulty in achieving adherent and visually appealing diamond-like characteristics, especially with cubic zirconia, which has high dispersion leading to white flash and susceptibility to UV degradation.
Innovation Solution
A method involving a slurry of sub-10 nm diamond particles applied via van der Waal's forces, followed by a stabilization layer of DLC or nitrides/oxynitrides, allowing for a nano-crystalline diamond coating at room temperature to 200°C, enhancing adherence and optical properties to mimic natural diamond, and providing abrasion resistance and UV protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high temperature CVD processes are used to deposit diamond coatings, then diamond film quality and adhesion are improved, but substrate damage and color change occur due to inability to withstand high temperatures
Solution Approach 1:
The patent changes the temperature parameter from high temperature (900-1500°C) to low temperature (room temperature to 200°C), and changes the deposition mechanism from CVD growth to slurry coating with van der Waals adhesion, thereby protecting temperature-sensitive substrates while still achieving diamond coating
Solution Approach 2:
The patent introduces a slurry medium containing sub-10 nm diamond particles as an intermediary carrier to transfer diamond material to the substrate surface, enabling low-temperature deposition while maintaining coating quality through the stabilizing effect of the slurry composition
2Strength
If conventional diamond coatings are applied to cubic zirconia, then hardness is improved, but white flash and UV degradation persist due to high dispersion properties of CZ
Solution Approach 1:
The patent applies a targeted nanodiamond coating layer specifically on the cubic zirconia surface that locally modifies optical properties by reducing dispersion effects and providing UV protection, while maintaining the underlying CZ structure and its desirable characteristics
Solution Approach 2:
The patent creates a composite structure combining cubic zirconia substrate with nanodiamond coating layer, where the nanodiamond particles (sub-10 nm) in the slurry form a protective matrix that addresses optical deficiencies (white flash) and provides UV resistance while preserving hardness improvement
3Reliability
If sub-10 nm diamond particle slurry is used for coating, then adhesion and optical properties are enhanced, but additional stabilization layers are required to maintain durability
Solution Approach 1:
The patent performs preliminary stabilization by incorporating specific components (such as metal oxides or organic stabilizers) into the nanodiamond slurry before application, which pre-establish strong bonding to the substrate and prevent particle aggregation, reducing the need for complex post-coating treatments
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 results in a highly adherent nano-crystalline diamond coating that improves the physical and optical characteristics of gemstones, reducing white flash and enhancing durability, while maintaining the appearance and stability of the substrate, including improved resistance to abrasion and UV degradation.
Implementation Method 1
A method involving a slurry of sub-10 nm diamond particles applied via van der Waal's forces
Implementation Method 2
followed by a stabilization layer of DLC or nitrides/oxynitrides
Data Source
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Figure 5
AI summary
A method to apply nano-crystalline diamond onto a selected substrate, comprising preparing a nanodiamond slurry of nanodiamond particles dispersed in a medium; immersing the selected substrate in the nanodiamond slurry for a predetermined period of time; removing the substrate from the slurry; drying the substrate and nanodiamond slurry that is adherent to the substrate with a flow of inert gas whereby the substrate is left coated with a coating of the nanodiamond particles that are adherently held by van der Waals forces; and selecting the medium in which the nanodiamond particles are dispersed to be a chemically functionalized carrier medium that includes a volatile component and an inorganic oxide, the volatile component being selected to evaporate at ambient room temperature or at elevated temperature and atmospheric pressure to leave behind the inorganic oxide.