- Aug 16, 2007
The better way i heard can be black anodization, but as far as i know, is virtually impossible to obtain on a non-metallic surface ..... wondering if the anodization process can be made on the side of a TEC with gold plated layer, without destroy the TEC or the gold coating ..... maybe a low current process keeping the TEC plate with only the gold layer in contact with the surface of the liquid ..... can require a complicate setup, anyway .....
Anodization only works on a very select set of metals, aluminium being best known since its anodized more often than not in many applications.
The anodization process results in a certain color depending on layer thickness, and the layer can be transparant for visible light. It is however possible, and often done, to include a dye in the anodized layer giving it a black (or some other) color.
As far as paint goes: something intended to radiate heat well might be suitable, this could be paint for exhaust systems, or, for example black radiator paint. I'm sure there are blacker materials available, but not easy to apply or obtain. Carbon black pigment springs to mind, but i doubt that would tolerate higher power densities very well.