When it comes to creating coatings or layers on materials, two common methods are PCD (Polycrystalline Diamond) and CVD (Chemical Vapor Deposition).
7 Key Differences Between PCD and CVD
1. Composition
PCD tools are made by brazing a diamond wafer to a carbide body.
CVD tools, on the other hand, are carbide end mills with a relatively thick layer of polycrystalline diamond grown into them.
2. Cutting Edge
PCD tools have a sharp cutting edge.
CVD tools have a rounded cutting edge due to the grown layer of diamond.
3. Process
PCD is created by brazing a diamond wafer onto a carbide body.
CVD involves growing a layer of diamond onto a carbide substrate using chemical vapor deposition.
4. Coating Thickness
In PCD, the diamond layer is relatively thick.
In CVD, the diamond layer is much thinner.
5. Deposition Method
PCD deposition is a physical process where the diamond wafer is directly brazed onto the carbide body.
CVD deposition is a chemical process where the diamond layer is grown from a gas phase onto the carbide substrate.
6. Chemical Reaction
PCD deposition does not involve any chemical reactions.
CVD deposition relies on chemical reactions that occur on the surface of the substrate.
7. Deposition Uniformity
CVD coating is in a flowing gaseous state, leading to a diffuse multidirectional deposition.
PVD (Physical Vapor Deposition), including PCD, involves vaporizing solid physical particles into a plasma, resulting in a line-of-site deposition. This means that CVD coatings can be more uniform and have better coverage on uneven surfaces compared to PVD coatings.
Continue exploring, consult our experts
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