Re: Ceramic coatings has microcracks

Posted by Gordon England ( on 15:09:21 03/12/05

In Reply to: Ceramic coatings has microcracks posted by Canan Barış

Depends on what you mean by microcracks. Most thermal spray ceramic coatings naturally contain microcracks of the type which are hard to resolve using normal metallography and tend only to span a few particle splats at most.
These ceramic coatings by there nature tend to be somewhat permeable (porosity, microcracks, particle boundaries etc.)so sealing these coatings is very important along with using a corrosion resistant bond coat material.
Increasing coating thickness does increase the barrier effect, but depending on your coating type and method of application the coating will have a maximum coating thickness limitation. It is wise to stay well within this limitation as cracking and delamination problems may increase with thickness.

Regards Gordon

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