What is a CVD diamond?

What is a CVD diamond?

CVD (Chemical Vapor Deposition) diamond. The mixture of carbon-containing gas and oxygen is excited and decomposed at high temperature and pressure below standard atmospheric pressure to form active diamond carbon atoms, which are deposited on the substrate and alternately grown into a polycrystalline diamond (or controlled deposition growth conditions to deposit and grow diamond single diamond). crystal or quasi-single crystal).

Are CVD diamonds real diamonds?

CVD diamonds are often referred to as synthetic diamonds or CVD synthetic diamonds. Despite their name, CVD diamonds chemically share the same elemental structure and physical, chemical, and optical properties as natural diamonds.

In 2018, the FTC ruled that synthetic diamonds and natural diamonds are the same things regardless of intent and purpose: 100% diamonds!

CVD diamonds go through the same certification process as natural diamonds and are graded according to the 4Cs - color, cut, clarity, and carat. Additionally, the Gemological Institute of America (GIA) has been grading lab-grown diamonds since 2007, and each diamond is purchased with an official grading report to confirm its quality and value.

Why choose CVD diamonds?

The cost of manufacturing CVD diamonds is much lower than the cost of mining and transporting natural diamonds – not to mention the additional labor and environmental costs associated with diamond mining.

CVD diamonds do not come from mines. They are not used for funding conflicts. They produce virtually no mineral waste. As such, they offer some fairly significant benefits (even if they are benefits you can't see under a microscope) compared to natural diamonds.

If you are looking for an unmatched quality diamond that is brighter and whiter than all other diamonds, a CVD diamond will allow you to get it for a fraction of the cost of a natural diamond of the same quality. CVD diamonds are up to par for durability and beauty. In fact, CVD diamonds have the potential to be purer than natural diamonds because they are made under carefully controlled conditions. This makes CVD diamonds an excellent choice for anyone who wants unmatched color and clarity.

CVD diamond applications?

Application of mechanical properties of CVD diamond

The high hardness and high wear resistance of diamonds make the diamond film an excellent tool material. As a tool material, the diamond film can be used in two different forms. The first form is to peel off the deposited diamond film, then re-cut, grind, and weld to the end of the tool. Because this brazing strength is much lower than the bonding strength between the diamond layer of PDC material and the cemented carbide. When it is applied to intermittent cutting, the connection of the interface becomes very fragile. If the brazing problem of CVD diamond can be solved, then CVD diamond tool materials will be able to compete with PCD materials in the entire machining field. Compared with PCD, this material has the advantages of good thermal stability and long tool life. The disadvantage is that the cohesive strength between the grains is low, and the material exhibits greater internal stress and brittleness. In addition, the lack of electrical conductivity of CVD diamond hinders the material
The application of materials to EDM cutting and polishing processing technology. And this technology has been widely used in the diamond tool processing industry, especially the sharpening and heavy sharpening of wood tools. The second form is to deposit the diamond film directly on the surface of the tool. The film thickness is thinner and the cost is lower. This method also has shortcomings: the adhesion of the deposited film to the substrate material is not easy to improve.

Application of thermal properties of CVD diamond

An important property of CVD diamond is its extremely high thermal conductivity. At room temperature, the thermal conductivity of diamond is five times that of copper. At the same time, it itself is an excellent insulating material. Therefore, the diamond film can be used to make heat sink materials for high-power optoelectronic components. Application of the optical properties of CVD diamond. Diamond has high spectral pass performance in a long-wavelength range from ultraviolet to far-infrared. Coupled with the excellent mechanical and thermal properties of King Kong, the diamond film becomes an excellent optical window material that can be used in harsh environments.

Other applications of CVD diamond

For example, the extremely high propagation speed of acoustic waves in diamond is used to make high-quality diamond thin film acoustic devices, and the chemical stability of diamond is used to make various types of biosensor devices, and so on.

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