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Wan L.,Hefei University of Technology | Cheng J.,Hefei University of Technology | Cheng J.,Research Center for Powder Metallurgy Engineering and Technology of Anhui province | Fan Y.,Hefei University of Technology | And 5 more authors.
Materials and Design | Year: 2013

A novel glycine-nitrate process (GNP) has been developed to fabricate ultrafine W-20wt.%Cu (W-20Cu) composite powders, with ammonium metatungstate [(NH4)6H2W12O40{dot operator}xH2O], cupric nitrate trihydrate [Cu(NO3)2{dot operator}3H2O] as main raw materials and glycine[C2H5NO2] as a complexant and incendiary agent. Precursor powders were obtained after the self-propagation reaction in a suspension containing above materials. The precursor powders were then hydrogen-reduced to convert into W-20Cu powders. Phase constitution and morphology of the precursors, as well as the resultant W-20Cu powders were characterized. Density and microstructure of the sintered W-20Cu samples were tested to investigate the sinterability of the W-20Cu powders. It is shown that the GNP produces superfine W-20Cu powders with particle size of about 200nm. The powders show good sinterability. Relative density above 98.1% of the theoretical is achieved for the powder compacts sintered at 1200°C in hydrogen. The sintered W-20Cu samples have electrical conductivity of 40.1% IACS and a Vickers hardness of 278. © 2013 Elsevier Ltd.

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