Chemical Vapor Deposition
It stands for Chemical Vapor Deposition. A material is deposited layer by layer from Gas onto the substrate and a process of chemical reactions helps develop the CVD diamond.
It is a made diamond which is prepared by synthetic methods in laboratories.
Diamond seeds are placed in chambers which are sealed and heating of approximately 700-900 degree Celsius is provided. Methane is usually used since it is carbon rich. The gases are ionized into plasma microwaves and lasers. This process breaks down the molecular bonds in the gases and the carbon deposits on the seed of diamond layer by layer.
No they are not artificial diamonds. They are called synthetic diamonds that is the reason why people sometimes misinterpret them as artificial diamonds. They exhibit the same physical and chemical properties like natural diamonds. They have the same lustre and hardness as natural diamonds.
Usually the resale value of Lab grown diamonds is 50% buyback. Of course they are able to sell at discounted values.
Atomic hydrogen plays a key role in the CVD diamond process. Atomic hydrogen etches graphite and it breaks up the double bonds of graphite into the diamond bonds.
In CVD diamonds a mixture of hydrogen and methane is used.
A growth temperature of approx. 800 degree Celsius is usually provided.
On large areas diamond deposits at growth rates between 0.1 and 10 micron per hour. In smaller areas large growth rates can be achieved.
Diamond, silicon, tungsten, molybdenum etc. can be used as substrate material. These are material on which Diamond can deposit easily. The substrate material should be able to withstand high temperatures.
The grain size at the growing surface of a diamond film is about 10% of the film thickness.
Re-nucleation can be used during diamond growth and grains can be kept very small. This material used in re-nucleation is nano-crystalline diamond. This material does not have all properties of a diamond but has a smooth surface.
The surface of a grown up polycrystalline diamond is typically rough. Polishing is very much necessary after the production of diamond is over in laboratories.
DLC stands for Diamond like Carbon. In this carbon atoms do not deposit in the form of crystal lattice but in the form of an amorphous network. It can be done at room temperature also. It is diamond like but not exactly a diamond.
There are various companies that provide CVD diamond. We are one of the leading companies in the production and distribution of CVD diamonds.
There can’t be a comparison since natural diamonds undergo hundreds of years of geological transformation whereas CVD diamonds are made in controlled environment in laboratories. Still both type of diamonds have same physical and chemical properties, shine and hardness.
Mostly CVD diamonds are less expensive than natural diamonds. After all there is a world of difference between the way both are produced.l
No it is not a billion market.
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