Passivation of Compacted Samples Made of Pyrophoric Iron Nanopowders during Their Interaction with Air

Combustion, Explosion, and Shock Waves - Various macrokinetic modes of interaction (self-ignition or combustion) of compact samples from nonpassivated (pyrophoric) and passivated iron nanopowders...     

Low-additive uranium alloys for the fuel elements of the KS-150 reactor

Conclusion The investigations showed a high resistance to swelling in an alloy of uranium with small amounts of aluminium and chromium at a burnup value of 1 at.%. The hot-working scheme for the alloy, including hardening of the solid solution, annealing (aging), and hardening, ensured the formation of a fine-grained isotropic structure with a finely dispersed distribution of second-phase particles, which facilitated the effective utilization of the alloying additives in limiting the cavitation and vacancy swelling of the uranium.The results obtained showed that an alloy of uranium with aluminum and chromium will make it possible to obtain high burnup values in the KS-150 reactor.Translated from Atomnaya Énergiya, Vol. 42, No. 6, pp. 452–456, June, 1977.     

Sintered magnesium and magnesium-beryllium alloys

Summary The use of powder metallurgy methods for the production of magnesium alloys is highly promising. By employing technological procedures widely known in powder metallurgy practice, it is possible to make magnesium alloys whose production by the methods of melting and casting would be hardly feasible.The addition of finely dispersed magnesium oxide and an excess beryllium phase to the magnesium matrix secures an excellent combination of long-time oxidation and heat resistance at temperatures substantially above the permissible operating temperatures of the usual magnesium-base alloys.     

Connection between strength of organic complex yarns and reinforced plastics based on them

Conclusions The evaluation of the quality of elementary filaments of poly-p-amidobenzimidazole from the breaking load of a complex yarn 500 mm long should be taken as unfortunate.Testing specimens 30 mm long can be recommended for evaluating the quality of untwisted complex PABI yarns.Increasing the strength of complex yarns 30 mm long leads to a proportional rise in the strength of an organoplastic. In testing specimens of organoplastic 500 mm long, increasing the strength of the complex yarns by 10% leads to only a 3–4% rise in the strength of the organoplastic.The strength of a microplastic is a natural quality criterion for twisted complex yarns.Translated from Khimicheskie Volokna, No. 1, pp. 27–29. January–February, 1989.     

Corrosion resistance of fuel element steel cladding in a lead coolant

The corrosion resistance of experimental and industrial steels considered as possible materials for fuel element cladding in the BREST reactor is investigated. Static corrosion tests in lead at 750°C lasting up to 1000 h, as well as metallographic and x-ray analysis, have been performed. Data are provided on the composition and relative width of a diffusion barrier in the form of complex oxides arising in the corrosion interaction zone and impeding the diffusion of oxygen into steel, as well as the values of the averaged oxygen diffusion coefficient. The corrosion resistance in lead of the newly developed steel Kh18S2VBFMAYu and steel 16Kh12MVSFBR (ÉP 823) proposed as cladding for fuel elements in the BREST reactor is analyzed.