The disadvantages of PVD coating include:
1. Difficulty in coating undercuts and similar surface features due to the line-of-sight transfer characteristic of most PVD coating techniques. However, some methods allow for full coverage of complex geometries.
2. High capital cost, as PVD coating processes can be expensive, especially for large surfaces or complex shapes.
3. The rate of deposition is generally slow, which may not be suitable for applications that require quick coating.
Some additional disadvantages mentioned in the references include:
4. PVD technologies typically operate at high temperatures and vacuums, requiring special attention by operating personnel.
5. Requires a cooling water system to dissipate large heat loads.
Despite these disadvantages, PVD coatings offer several advantages. They provide improved hardness, wear resistance, and oxidation resistance. They also offer improved corrosion resistance, making them suitable for outdoor or marine environments. PVD coatings can be applied in various colors, allowing for a wide range of aesthetic options. Additionally, PVD coatings are environmentally friendly as they do not emit harmful chemicals during the coating process.
It is important to note that PVD coatings have limited thickness, typically less than a few microns. Therefore, they may not provide sufficient protection for some applications. The specialized equipment required for PVD coating processes can be expensive and require trained personnel.
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