Re: Ceramic coating on Polyurethane

Posted by Mark Jarratt ( on July 01, 2004 at 17:40:48:

In Reply to: Re: Ceramic coating on Polyurethane posted by Gordon England on March 19, 2004 at 01:53:59:

: : Dear Sir,

: : Is ceramic coating on polyurethane possible ?

: : The component is made of polyurethane on which slurry, iron ore and coal circulate at ambient temprature. The material has a tendency to adverse against the polyurethane surface. PH value is normal. The rotating speed is a min of 2 meters per cubic hour with a maximum of 10. We would like to know -

: : What kind of ceramic can be used ?

: : What is the maximum thickness that can be built up ?

: : Can 9 Mohr scale hardness be acheived with ceramics ?

: : We would also like to know if tungesten carbide can be sprayed on polyurethane surface.

: : If yes what are the pre cautions that need to be taken.

: : Are there any other options ?

: : Thank you in advance.

: : Chris

: :

: Hi Chris

: A cautious yes to your first question. Most oxide ceramic and carbide type materials that can be thermal sprayed may be possible with the right preparation, bond coat and thermal spray procedure.

: I have sprayed chromium oxide, alumina and tungsten carbide/17% cobalt onto specially prepared glass and carbon fibre reinforced polymer tubes to 0.012 - 0.016" but unfortunately this does not always apply in every case. Some plastic substrates just reject any coating.

: The hardest thermal spray ceramic that I know of is chromium oxide reaching about 1800 HV/1 (8-9 moh's)at best. Alumina is normally around 1000 HV as the coatings contain softer metastable phases unlike the hard alpha phase found in bulk alumina ceramics.

: The only way to know for sure if a thermal spray coating can be successfully applied is to try it. In my experience some development work is usually required in each new application case. Spraying onto polymers is extremely technique dependent and following the general guidelines for spraying onto metallic substrates will almost certainly result in failure.

: Other options - ceramic tiles?
: Why polyurethane substrate?

: Regards Gordon


You can deposit ceramic coatings into polyurethane
as long as the load in the application is relatively low. As far as vacuum PVD goes you would only be able to deposit up to around 5 microns. CrN would probably be you're best bet.

For PVD theory follow the link

Follow Ups:

Surface Engineering Forum

Surface Engineering Message Board Archive

Surface Engineering Message Board Archive Index

Post A Message!

Gordon England Surface Engineering ForumPlease go to the new Surface Engineering Forum as this old message board is a read only archive. Please copy and paste relevant information or link to the page if you wish to reactivate a thread on the new forum.

Gordon England Independent Thermal Spray Coating Consultant
Telephone: +44 (0)1252 405186


Site Links


Nature of Thermal Spray Coatings

Surface Engineering in a Nutshell

Surface Engineering Forum

Thermal Spray Gun Repair Service

Plasma Consumable Parts

Thermal Spray Powder Supplies


Thermal Spray Coatings on Carbon and Glass Fibre Reinforced Polymers

HVOF Coating of Paper Making Roll

Abradable Coatings


Thermal Spray Processes:

Combustion Wire Thermal Spray Process

Combustion Powder Thermal Spray Process

Arc Wire Thermal Spray Process

Plasma Thermal Spray Process

HVOF Thermal Spray Process

HVAF Thermal Spray Process

Detonation Thermal Spray Process

Plasma Flame Theory

Cold Spray Coating Process

Wear and Use of Thermal Spray Coatings

Corrosion and Use of Thermal Spray Coatings

Glossary of Thermal Spray and Surface Engineering Terms

Image Directory for Thermal Spray Coatings

Plasma Gas Flow Information

Plasma Gas Flow Correction Calculator

Contact Form

Links to other interesting sites related to thermal spray and surface engineering

Reciprocal Links

Periodic Table of the Elements

SI Units

Calculators for Conversion between Units of Measurement

Hardness Testing

Surface Engineering Message Board Archive

Surface Engineering Message Board Archive Index

Photography Gallery2

Photography Gallery3

© Copyright Gordon England