Refractory Metals
نویسندگان
چکیده
منابع مشابه
Trace Characterization of Refractory Metals by Activation Techniques
The application of activation techniques to the assay of the refractory metals niobium, molybdenum, tantalum and tunjsten for their trace element impurities is reviewed. Activation with reactor neutrons, fast neutrons, charged partides and photons in connection with both the non-destructive and the radiochemical performance is considered. The decisive contribution of activation techniques to th...
متن کاملSintering Aids in Powder Metallurgy THE ROLE OF THE PLATINUM METALS IN THE ACTIVATED SINTERING OF REFRACTORY METALS
When a metallic powder is subjected to a suffkiently high pressure a certain amount of adhesion takes place between individual particles. If this compact i s then sintered the bond is improved by diflusion and intergranular grain growth. The earliest known platinum objects were fabricated by such a powder metallurgical process, and when European scientists first addressed the problem of manufac...
متن کاملThe Welding and Brazing of the Refractory Metals Niobium, Tantalum, Molybdenum and Tungsten - a Review*
This review covers the present and future problems in the development and welding of niobium, tantalum, molybdenum and tungsten and their alloys. Their metallurgical characteristics are discussed together with the influence of impurities and alloying elements on mechanical properties, alloy development and weldability. Other factors briefly discussed are availability, high temperature strength,...
متن کاملHydrogenic retention of high-Z refractory metals exposed to ITER divertor relevant plasma conditions
1) FOM-Institute for Plasma Physics Rijnhuizen, www.rijnhuizen.nl, Assocaition EURATOMFOM, Trilateral Euregio Cluster, Nieuwegein, the Netherlands 2) Instituto Tecnológico e Nuclear, Sacavém, Portugal 3) Max-Planck-Institut für Plasmaphysik, Association EURATOM, Garching, Germany 4) Leiden Institute of Chemistry, Gorlaeus laboratory Leiden, The Netherlands 5) Eindhoven University of Technology,...
متن کاملAb initio calculations of the melting temperatures of refractory bcc metals.
We present ab initio calculations of the melting temperatures for bcc metals Nb, Ta and W. The calculations combine phase coexistence molecular dynamics (MD) simulations using classical embedded-atom method potentials and ab initio density functional theory free energy corrections. The calculated melting temperatures for Nb, Ta and W are, respectively, within 3%, 4%, and 7% of the experimental ...
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ژورنال
عنوان ژورنال: Nature
سال: 1966
ISSN: 0028-0836,1476-4687
DOI: 10.1038/2121524a0