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COMPACTION OF TUNGSTEN CONTAINING ULTRA-DISPERSE POWDER IN DYNAMIC CONDITIONS
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.
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