PVD diamond stands for physical vapor deposition diamond.
It is a method of depositing a layer of pure polycrystalline diamond onto the surface of a pre-fabricated conventional PCD (polycrystalline diamond) component.
PCD is a class of super hard materials made by high temperature and high pressure consolidation of synthetic diamond grains.
PCD has many industrial applications such as rock drilling, metal cutting, mining operations, construction, demolition tools, and wood working.
However, PCD tools can suffer from fracturing and catastrophic breakages, so there is a need for improvement in their corrosion resistance, thermal stability, and wear resistance.
What is PVD Diamond? 5 Key Points to Understand
1. The Basics of PVD Diamond
PVD diamond coating on HTHP PCD diamond is a technology that addresses these issues.
It involves depositing a layer of pure polycrystalline diamond onto the surface of a pre-fabricated conventional PCD component using physical vapor deposition or chemical vapor deposition.
PVD and CVD are two methods used for diamond coating.
2. The PVD Process
In the PVD process, a layer of pure polycrystalline diamond is deposited onto the surface of the PCD component by physical vapor deposition.
The PCD component is placed in a vacuum chamber, and a high-energy beam or plasma is used to vaporize the diamond material.
The vaporized diamond then condenses onto the surface of the PCD component, forming a thin layer of diamond coating.
3. The CVD Process
In the CVD process, a layer of pure polycrystalline diamond is deposited onto the surface of the PCD component by chemical vapor deposition.
In this process, a diamond seed, which is a thin slice of diamond, is selected and thoroughly cleaned.
The diamond seed is typically taken from a high-quality diamond created by high temperature and high pressure consolidation.
The cleaned diamond seed is placed in a growth chamber, and a mixture of gases is introduced into the chamber.
The gases react and form a plasma, which causes the diamond material to deposit onto the surface of the PCD component, growing a layer of diamond coating.
4. Benefits of PVD and CVD Diamond Coatings
Both PVD and CVD diamond coatings improve the corrosion resistance, thermal stability, and wear resistance of PCD components.
The PVD and CVD processes allow for finer control over the environment within the growth chamber, resulting in improved properties of the polished diamond.
However, it's important to note that the size of lab-grown CVD diamonds is currently limited, with the largest known polished lab-grown CVD diamond being 3.23 carats.
5. Summary
In summary, PVD diamond is a method of depositing a layer of pure polycrystalline diamond onto the surface of a pre-fabricated conventional PCD component using physical vapor deposition.
This process improves the corrosion resistance, thermal stability, and wear resistance of PCD tools.
CVD diamond is another method that can be used for diamond coating, where a layer of pure polycrystalline diamond is deposited onto the surface of the PCD component using chemical vapor deposition.
Both PVD and CVD diamond coatings have their advantages and help enhance the performance of PCD components in various industrial applications.
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