Ultramet coats the exterior of the rhenium chamber with a black rhenium coating to provide an emittance of nearly 1.00 that results in enhanced radiation cooling. On each end, niobium flanges, manufactured at Ultramet by chemical vapor deposition, simplify attachment to the injector and the exhaust cone.
The iridium/rhenium chamber is state-of-the-art for NTO/MMH and NTO/N2H4 propellant systems. Since the mid 1990s, Ultramet has sold an average of nearly 10 iridium/rhenium chambers each year for satellite integration and flight, and demand is increasing. These high-performance engines save fuel and expand the possibilities for mission planners. Some missions would not have been possible without the performance offered by Ultramet’s iridium/rhenium chambers.