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| This technology enables production of products that resist corrosion and retain their strength even at extremely high temperatures, yet are extremely lightweight. These advantages are provided through an advances method of depositing a layer of rhenium on lightweight carbon substrates. This technology was developed for rocket nozzles, heat exchangers and high temperature valves.enables production products resist corrosion retain strength even extremely temperatures yet lightweight advanced depositing layer rhenium carbon substrates rocket nozzles heat exchangers valves composite element stream gaseous hexafluoride flow onto chemical vapor deposition reaction hydrogen causes reduction hexaflouride metal thereby uniform surface fine grain coating average particle diameter 25 micrometers elements alone bonded together various articles corrosive resistant structural widely known fiber/carbonmatrix structures exceptional susceptible oxidation erosion exposed oxidizing environments moderate vulnerable hostile present exhaust gases steam turbines carbon-carbon applications severe protective Rhenium successfully materials erosive Yet quality depends crystalline Uniform grained best results Large metallic introduce stress points fracture crack formation cycling exposing underlying small grains tendency ductility film ability survive large variations ductile conform stresses differences thermal expansions Typical deposits order 60 contamination due diffusion reduce increase brittleness components fabricated coated composites difficulties first relatively minimized find dimensions bonding adjacent sheets enhance braze indiffusion enhanced rapid growth deposited maintains |
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