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W-15 wt%Cu nano-composite produced by hydrogen-reduction/sintering of WO3-CuO nano-powder

Ahmadi, E ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ijrmhm.2010.02.002
  3. Abstract:
  4. A two-stage hydrogen-reduction/sintering procedure was used to synthesize W-15 wt%Cu nano-composite tablets. Hydrogen-reduction was carried out at 600, 650, 700 and 750 °C for 15-90 min and sintering was performed at 1100, 1150, 1200 and 1250 °C for 60 min. Morphology and grain size of the products were rigorously investigated by scanning electron microscope (SEM), X-ray diffractometer (XRD) and nano-particle Zeta-sizer. Maximum consolidation of the nano-composite product was achieved at 1200 °C. Hydrogen-reduction at 700 °C for 90 min showed an average particle size of ∼72.9 nm. Total reduction was achieved at higher temperatures and longer times. The mixture had a homogeneous structure with 16.1 ± 0.1 g/cm3 density when sintered at 1200 °C for 60 min
  5. Keywords:
  6. Hydrogen-reduction ; Nano-composite ; Average particle size ; Grain size ; Higher temperatures ; Homogeneous structure ; Nano powders ; Scanning electron microscopes ; Two stage ; W-Cu ; X ray diffractometers ; Hydrogen ; Nanocomposites ; Scanning electron microscopy ; Tungsten alloys ; Tungsten compounds ; X ray diffraction ; Sintering
  7. Source: International Journal of Refractory Metals and Hard Materials ; Volume 28, Issue 3 , 2010 , Pages 441-445 ; 02634368 (ISSN)
  8. URL: http://www.sciencedirect.com/science/article/pii/S0263436810000235