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20 Common Defects in Physical Vapor Deposition

Common Defects in Physical Vapor Deposition

Due to their excellent wear resistance, heat resistance and other properties, PVD coatings are widely used in various industries. However, the defects of the coating make it impossible to demonstrate all of its advantages. If you want to solve the defects in PVD coating, you must know these defects, at least you should know – what is it? The table below describes the 20 common defects in Physical Vapor Deposition, and you may be able to find the defects appeared in your project.

Spraying Defects

No. Defects Definition
1 Impurities Visible particles or filaments are embedded on the surface of the product.
2 Orange Peel The entire coating or topcoatis wrinkled or mottled.
3 Runs/Swells The paint flows downward due to gravity during the film formation process, causing defects such as unevenness on the surface of the product, uneven thickness of the upper and lower paint films,and thickening of the bottom edge.
4 Rainbow Rainbow refers to a rainbow-like effect when the product surface is reflective. It is not always a defect in PVD coating. In other words, if used properly, the rainbow can be a colorful feature of the products, as shown below.
5 Gnawing/Burning Marks It refers to the phenomenon of blackening, wrinkling, swelling, blistering or even falling off when the topcoat is sprayed on the surface.
6 Scratching The surface of the product has wear, grooves or nicks, etc.
7 Pin Holes The small holes formed during the primer or topcoat and drying process are called Pin Holes.
8 Color Tone Deviation There are differences in the overall or partial color of the product.
9 Overspray Paint is sprayed where it should not be sprayed.
10 Misses Paint is sprayed insufficient.
11 Cracking/Crazing Fine cracks are formed on the surface of the coating.
12 Whitening/Misting The primer is not fully cured and a cloudy white paint film is produced after spraying.
13 Blister/Bubble Visible bubbles or blisters (complete or ruptured) appear on the surface, middle or lower layer of the layer.
14 Gloss Deviation There are differences in the overall or partial gloss of the product.
15 Matting/ Blooming Part of the coating is rough or powdery.

Sputtering & Evaporation Defects

1 Color Tone Deviation There are differences in the overall or partial color of the product.
2 Skip/Misses Some areas have no or less film coated.
3 Scratching The surface of the product has wear, grooves or nicks, etc.
4 Overspray The material is deposited where it should not be coated.
5 RF Test NG In the RF test, the absolute value of the difference between the finished product and the material’s dB value is greater than the set standard.

The cause of each defect is different, and the solution, of course, is different. If you are eager to know the solution to the defect, you can contact SAM staff and we will do everything possible to help you. Or you can continue to follow our website news, and we will summarize the causes and solutions of these defects later.

For more information, please visit https://www.sputtertargets.net/.

 

About the author

Julissa Green graduated from the University of Texas studying applied chemistry. She started her journalism life as a chemistry specialist in Stanford Advanced Materials (SAM) since 2016 and she has been fascinated by this fast growing industry ever since. If you have any particular topics of interest, or you have any questions, you can reach her at [email protected]

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About Us

Stanford Advanced Materials (SAM) Corporation is a global supplier of various sputtering targets such as metals, alloys, oxides, ceramic materials. It was first established in 1994 to begin supplying high-quality rare-earth products to assist our customers in the research and development (R&D) fields.

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