Loading...

Investigation on the characteristics of micro- and nano-structured W-15 wt.%Cu composites prepared by powder metallurgy route

Abbaszadeh, H ; Sharif University of Technology | 2012

1457 Viewed
  1. Type of Document: Article
  2. DOI: 10.1016/j.ijrmhm.2011.07.017
  3. Publisher: 2012
  4. Abstract:
  5. The properties of W-15 wt.%Cu composites were investigated by preparing two distinct composites of micrometer and nanoscale structures. Micrometer composite was produced by mixing elemental W and Cu powders and nanometer one was synthesized through a mechanochemical reaction between WO3 and CuO powders. Subsequent compaction and sintering process was performed to ensure maximum possible densification at 1000-1200 °C temperatures. Finally, the behavior of produced samples including relative density, hardness, compressive strength, electrical conductivity, coefficient of thermal expansion (CTE) and room temperature corrosion resistance were examined. Among the composites, nano-structured sample sintered at 1200 °C exhibited better homogeneity, the highest relative density (94%) and mechanical properties. Furthermore, this composite showed superior electrical conductivity (31.58 IACS) and CTE (9.95384 × 10- 6) in comparison with micrometer type. This appropriate properties may be mainly attributed to liquid phase sintering with particle rearrangement which induced by higher capillary forces of finer structures
  6. Keywords:
  7. Capillary force ; Electrical conductivity ; Finer structure ; Mechanochemical reactions ; Mechanochemichal process ; Nano-structured ; Nanoscale structure ; Particle rearrangement ; Particle size effect ; Relative density ; Room temperature ; Sintering process ; Sintering temperature ; W-Cu composites ; Compressive strength ; Corrosion resistance ; Density (specific gravity) ; Electric conductivity ; Hardness ; Micrometers ; Nanostructures ; Powder metallurgy ; Powders ; Thermal expansion ; Tungsten compounds ; Sintering
  8. Source: International Journal of Refractory Metals and Hard Materials ; Volume 30, Issue 1 , 2012 , Pages 145-151 ; 02634368 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0263436811001454