What is the minimum surface roughness required in order for PECVD coating to be deposited properly and have proper adhesion?

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Pierluigi Traverso

Dear Dr. Samuel Hidajat,

I suggest you to have a look at the following interesting paper:

- Effect of substrate surface roughness on mechanical properties of diamond-like carbon coatings

N. J. Uhure, M. E. Fitzpatrick & S. V. Hainsworth

Tribology 1 (4), Pages 211-223 (2007)| Published online: 19 Jul 2013

Available in pdf at: https://www.tandfonline.com/doi/abs/10.1179/175158308X300441

Best regards, Pierluigi Traverso

Mahmood Hameed M.

dear Samuel Hidajat ;

surface roughness required for PECVD coating is between 15.4 nm± 2.4 nm to 1.29 nm ± 0.09 nm to form a coating with proper adhesion by increases the friction coefficient.

for more details can read;

Article The effect of substrate geometry and surface orientation on ...

Martin Heß

Ra 0.38754 µm.

Ruslan Melentiev

The rougher the better (High values of such parameters as Sz, Str, Sdr).

Ra solo is insufficient. Ra = 1 micron generated by polishing or milling provides twice lower work of adhesion than Ra = 0.5 generated by powder-blasting. Even a moon phase correlates with adhesion better )).