Effect of the conditions of sintering W-Ni-Fe-Co heavy alloy nanopowders on the structure and density of compacted samples View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2007-12

AUTHORS

K. B. Povarova, M. I. Alymov, O. S. Gavrilin, A. A. Drozdov, E. V. Evstratov, A. I. Kachnov, A. E. Sal’ko

ABSTRACT

A compact material made of a heavy tungsten alloy W-Ni-Fe-Co nanopowder is produced. The nanopowders are synthesized by the treatment of a solid tungstic acid in aqueous solutions of Ni, Fe, and Co salts followed by the reduction of the solid residue by hydrogen at 800°C (the average size of the powder conglomerates is ∼300 nm, and the conglomerates consist of 100-nm particles). Solid-phase sintering is performed in stages. An increase in the temperature at the last stage from 1300 to 1350 and 1450°C increases the density from 16.7 to 17.2–17.4 g/cm3 and the average tungsten grain size to 2.4–4.6 µm. The samples after solid-phase sintering at 1350°C have no porosity. Liquid-phase sintering of nanopowders with high surface and interface energies occurs at 1480°C. More... »

PAGES

499-505

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s0036029507060109

DOI

http://dx.doi.org/10.1134/s0036029507060109

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1053243377


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