Rhenium and Rhenium-tungsten Deposition by Thermochemical Reduction of the Hexafluorides--a Preliminary Study.
Electrodeposition and Surface Treatment Elsevier Sequoia S a Lausanne Switzerland 1973/74 :11 pages
Consolidated rhenium deposits of high purity can be obtained by the hydrogen reduction of ref6 from the vapor phase, although some rhenium always deposits as a loose, black powder. The temperature of the reaction zone and the volume ratio of h2 to ref6 significantly influence the amount of massive rhenium deposited. The near-optimum parameters are a temperature of 250 deg. C and a volume ratio of h2 to ref6 of 25 to 1. Operating at these gas ratios and temperature, with the equipment described, the best results were obtained with the deposition chamber at atmospheric pressure; both increasing pressure (to 790 millimeters of mercury) and decreasing pressure (to 600 millimeters of mercury) yielded excessive quantities of powdered rhenium. All tests at other than atmospheric pressure were made at the near-optimum parameters.
Electrodeposition and Surface Treatment, Elsevier Sequoia S.a., Lausanne, Switzerland, 1973/74