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Session Chairpersons: Jan-C. Carlén, Rhenium Alloys, Inc., P.O. Box 245, Elyria, OH 44036; Dr. R.H. Tuffias, Ultramet, 12173 Montague St., Pacoima, CA 91331
EVALUATION OF A RHENIUM COATING ON A MOLYBDENUM SUBSTRATE: Amber M. Dalley, C. Bagnall, Concurrent Technologies Corporation, 1450 Scalp Avenue, Johnstown, PA 15904; R.W. Buckman, Jr., Refractory Metals Technology, Pittsburgh, PA 15236
RHENIUM AND IRIDIUM: Evan K. Ohriner, Metals and Ceramics Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6083
Rhenium is used together with the metal iridium in a number of applications. Iridium has been used as coating for rhenium rocket thrusters and as an oxidation-resistant coating in a number of other applications. The high strength of rhenium at elevated temperature is combined with the oxidation resistance and high melting point of iridium. The use of the two metals together is advantageous due to the absence of any stable intermediate compounds. Coating life and properties are effected by solubility and diffusion rates. Rhenium and iridium alloying additions both improve the ductility of tungsten. The high solubility of rhenium in iridium is also being taken advantage of to produce iridium-based materials with a reduced electron work function. The uses of rhenium in conjunction with iridium are discussed. Managed by Lockheed Martin Energy Research under contract DE-AC05-96OR22464 with the U.S. Department of Energy.
DEVELOPMENT OF THE PARAMETERS OF THE PROCESS OF MANUFACTURING COMPLEX SHAPE PARTS FROM RHENIUM POWDER: Eugene P. Kratt, Victor N. Samarov, Laboratory of New Technologies, PO Box 31, 103001 Moscow, Russia,; Boris D. Bryskin, Rhenium Alloys, Inc., P.O. Box 245, Elyria, OH 44036
The research was aimed at developing the parameters of the process of manufacturing hollow parts from rhenium and rhenium alloy powders. With this purpose, the hot isostatic pressing technique was proposed. Tool design and choice of material for the tool were the main problems of the research. On the basis of the fulfilled experiments a rational scheme of manufacturing hollow complex shape parts with minimal allowances was developed. the parameters of this scheme are made the basis of the technology of manufacturing rocket engine nozzle type parts.
PREPARATION OF TEFLON PIPES WITH METALLIZED LAYER: E.G. Rakov, D. Mendeleyev University of Chemical Technology of Russia, Miusskaya Sq. 9, Moscow 125047, Russia
The method of deposition of thin rhenium layers on inner wall of teflon pipes (tubes) by means of filling the pipes by volatile rhenium compound and subsequent chemical reduction of this compound inside teflon pores was developed. The method allows to diminish permeability of teflon for gases or liquids and to change its electric properties: the inner layer becomes electroconductive. Such teflon pipes and details are necessary for neutralization of static electric charges in some devices. The depth of metallized layer, as it was shown by microscopic examination of pipe cross sections, did not exceed some tenth of millimeter. The method allows to deposit-metallized layers of definite configuration.
3:00 pm IRIDIUM-COATED RHENIUM RADIATION-COOLED ROCKETS: Brian Reed, James Biaglow, and Steven Schneider, NASA Lewis Research Center, 21000 Brookpark Road, Cleveland, OH 44135
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