DBPapers

COMPACTION OF TUNGSTEN CONTAINING ULTRA-DISPERSE POWDER IN DYNAMIC CONDITIONS

AUTHOR/S: N. M. CHIKHRADZE
Sunday 1 August 2010 by Libadmin2009

9th International Multidisciplinary Scientific GeoConference - SGEM2009, www.sgem.org, SGEM2009 Conference Proceedings/ ISBN 10: 954-91818-1-2, June 14-19, 2009, Vol. 2, 151-158 pp

ABSTRACT

An Investigation of explosive consolidation processes of W-Cu ultra-disperse and nano
sized powder compositions are discussed. For theoretical calculations of the explosive
loaded materials were used the hydrodynamic theory and experimental adiabatics of W
and Cu. The stress-deformed state of the steel ampoule-containers was estimated using
the solutions of elasticity theory.

Copper tungsten (W-Cu) powder compositions were consolidated to full or near-full
density by explosive-compaction technique. The industrial explosives were used for
generation of shock waves. To form W-Cu composite with compositions ranging from
W-20Cu to W-80Cu (weight %), ultra-disperse W powder was mixed with nanocrystalline
Cu. Each reaction mixture was placed in a sealed container and explosively
compacted using a cylindrical detonation scheme. Explosive compaction experiments
were performed in range of pressure impulse (5-20 GPA) and initial temperature (20-
1000C). X-ray diffraction (XRD), and microhardness measurements were used to
characterize the billet phases and mechanical properties. The results of analysis
revealing the effects of the W-Cu elemental ratio, loading conditions and precursor
particles sizes, affecting the consolidation quality are discussed.