Method for producing nanocrystalline diamond coatings on gemstones and other substrates
View Patent ↗A method to apply nano-crystalline diamond onto a selected substrate, including preparing Nanodiamond slurry of nanodiamond particles dispersed in a medium. The medium may include a liquid or a sol-gel. The selected substrate is immersed in the Nanodiamond slurry for a predetermined period of time. Then the substrate is removed from the slurry. The substrate is then dried with a flow of inert gas. The substrate is left coated with a coating of the nanodiamond particles that are highly adherently held by van der Waals forces.
1. A coated object comprising:
a substrate;
a first coating layer of highly adherent nanodiamond particles held to the substrate by van der Waals force; and
a second transparent coating layer overlying the first coating layer, the second transparent coating layer comprising nanodiamond particles embedded therein, wherein the substrate comprises a gemstone.
2. The coated object of claim 1 , wherein the second transparent coating layer comprises diamond like carbon.
3. The coated object of claim 2 , wherein the second transparent coating layer comprises an ion assisted plasma deposition.
4. The coated object of claim 2 , wherein the highly adherent nanodiamond particles comprise detonation nanodiamond crystals.
5. The coated object of claim 1 , wherein the second transparent coating layer comprises a metallic or non-metallic oxide, nitride or oxynitride.
6. The coated object of claim 1 , wherein the highly adherent nanodiamond particles are less than one hundred nanometers in size.
7. The coated object of claim 6 , wherein the highly adherent nanodiamond particles are less than five nanometers in size.
8. The coated object of claim 1 , wherein the substrate comprises a diamond containing at least one fracture open to a surface and wherein the first coating layer at least partially fills the fracture.
9. The coated object of claim 1 , wherein the second transparent coating layer comprises a combination of diamond like carbon and a metallic or non-metallic oxide, nitride or oxynitride.
10. The coated object of claim 1 , wherein the coated object is a transparent synthetic gem.