Platinum-black coatings for infrared emitters

Abstract

The technology of covering of IR sources with high emissivity materials was worked out. Platinum black was electrodeposited from H2PtCl6 solution on platinum foil. The current densities from 0.1 to 5 mA/mm2 and the deposition time from 1 to 15 minutes were employed. The microstructures of platinum black were examined using scanning electron microscopy. For the current densities below 1 mA/mm2 the island structures were received. For the current densities from 1 to 2 mA/mm2 first the island structure arises, next it changes to the sponge structure. For the current densities above 2 mA/mm2 only the sponge structures were observed. For the island structures multiple increases of emissivity coefficient were discovered. Instead, for the sponge structures the increase of emissivity coefficient was much lesser. The value of emissivity coefficient for examined covers was about 0.8 at temperature 1000°C. For the obtained IR sources stable work without changing the parameters is possible for the temperature up to 800°C.