High temperature - high emissivity coating
High temperature - high emissivity coating
(OP)
Hi everybody,
I am currently searching for a method to increase the total emissivity of a metallic surface to 0.85 or higher at temperatures up to 3000F (1650°C).
There are many manufacturers of plasma sprayed coatings on the market stating that their products (like iron tianate, aluminium titanate, boron nitride, etc)
will be compatible with the high temperature but emissivities are in most cases not known.
Other methods, like paints, CVD/PVD coatings may also be possible, but at the moment I am not sure how to start, so I would be happy to hear
some helpful statements,
thanks in advance and best regards
Feldmann
I am currently searching for a method to increase the total emissivity of a metallic surface to 0.85 or higher at temperatures up to 3000F (1650°C).
There are many manufacturers of plasma sprayed coatings on the market stating that their products (like iron tianate, aluminium titanate, boron nitride, etc)
will be compatible with the high temperature but emissivities are in most cases not known.
Other methods, like paints, CVD/PVD coatings may also be possible, but at the moment I am not sure how to start, so I would be happy to hear
some helpful statements,
thanks in advance and best regards
Feldmann





RE: High temperature - high emissivity coating
William Gunnar Naschak
http://www.IndustrialCoatingsWorld.com
http://www.nationalsurfacesolutions.com
RE: High temperature - high emissivity coating
There are a number of possibilities, but they depend on what you intend to do with the surface.
A couple of possibilities:
> Carbon nanotubes will act as a light trap
> Texturing the surface with anechoic chamber-like features will do about the same
TTFN
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RE: High temperature - high emissivity coating
the reason for the high emissivity is the need for better radiative cooling. The eps=0.85 value comes from our thermal analysis guys. The 0.85 is the minimum acceptable value.
There are many possibilities from the gas turbine industry involving a base layer with improved adherence, a ductile intermediate layer and the functional layer on top. But I am not sure if I really a need a multilayer option.
I need only 20 hours of operation at 3000F, involving approx 20 full thermal cycles, meaning much less accumulated operation time compared with gas turbine applications.
@irstuff: Do you know a manufacturer for these carbon nanotube coatings?
Best regards
Feldmann
RE: High temperature - high emissivity coating
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: High temperature - high emissivity coating
RE: High temperature - high emissivity coating
RE: High temperature - high emissivity coating
Maui
www.EngineeringMetallurgy.com