CVD Diamonds | Teva Diamonds

CVD REMARKABLE DIAMONDS AND GREAT SERVICE – ANSWERING YOUR QUESTIONS

At Teva Diamonds, we want to continue addressing the informative questions we have received from our amazing customers. Every question our customers ask is individually important and we take every effort to answer each one. From those, we have pulled together some of the most common regarding our elegant line of CVD (Chemical Vapor Deposition) Diamonds. Remember, if you have any questions please reach out to our team.

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WHAT SUBSTRATE MATERIAL CAN BE USED?

Various materials can be used like diamond, silicon, tungsten, molybdenum, silicon carbide, silicon nitride, quartz glass, cemented carbide, etc. The major requirements are the material must be able to withstand high temperatures and must not dissolve carbon.

WHAT IS THE DIFFERENCE BETWEEN SINGLE AND POLYCRYSTALLINE DIAMONDS?

The main difference between single crystal and polycrystalline diamond lies in the structure of diamond particles, which can be seen under a microscope. Although both abrasives are irregular polyhedral block particles, the polycrystalline diamond grains are arranged in disorder. As a result, it holds good toughness and can withstand higher stress.

WHAT CVD DIAMOND THICKNESSES ARE POSSIBLE?

Diamond thicknesses range from 30 nm, which requires free-standing diamond membranes mounted on silicon support, to 2mm, which are commercially available.

WHAT ARE THE TYPICAL GRAIN SIZES OF A POLYCRYSTALLINE DIAMOND?

Typically, the grain size is in the sub-micron range at the beginning of diamond growth and increases in thickness as the grains grow larger. The typical diamond film is about 10 % of the film thickness.

WHAT IS THE SURFACE ROUGHNESS?

Polycrystalline diamond film is similar to sandpaper and makes polishing an important step. The common surface roughness of polished diamond is a few nanometers.

HOW DOES CVD DIAMOND COMPARE TO NATURAL DIAMOND?

The properties of natural diamonds are wide-ranging. Thus, a sophisticated system for the categorization of natural diamond stones concerning color, clarity, and defects was created. High-quality polycrystalline CVD diamond does have similar properties to perfect natural stones. The two types are graded with the same system thus making comparisons quite uniform.

IS A CVD DIAMOND EXPENSIVE?

Yes and No. Small amounts of diamond film or small diamond parts are relatively cheap. Thicknesses more than 1mm are expensive. Larger the thickness the greater the energy needed for creation.