The initial stage of sintering for the W–Cu nanocomposite powder prepared from W–CuO mixture

Solid state and liquid phase sintering of mechanically activated W–20wt.% Cu powder mixture

“…For example, ∼90% densification can be obtained by solid phase sintering of 100 milled powder at 900 • C for 60 min. In consistent with the findings of other researchers [9][10][11][12], this observation can be explained on the basis of more homogenous distribution of Cu particles in the W matrix and the formation of nanocrystalline material. It is well known that plastic deformation of metallic powders during MA increases dislocation density and introduces more vaccines in crystalline lattices.…”

“…de Costa et al [10] have considered coalescence of nanoscaled W particles and migration of Cu to the particle surface as the reasons for this observation. Kim et al [11] have reported a significant shrinkage during heat-up of ball milled W-CuO mixture at 850 • C in hydrogen atmosphere as a result of the sintering of copper particles. Lee and Kim [12] have found that W-W sintering and W-Cu aggregation initiate the densification process during solid phase sintering (SPS).…”

Morphology studies of a W/Cu alloy synthesized by hydrogen reduction

“…The abovementioned processes have been successful only on a limited scale, and there is a strong need for the development of new process routes toward the production of W/Cu composites with tailor-made properties. 9,[13][14][15][16][17][18] The samples used in this work were reduced under isothermal conditions at 923 K by using thermogravimetric analysis (TGA). 19 The product's morphology and chemical composition could then be characterized by xray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM).…”

Preparation and characterization of Mo-15 Cu superfine powders by a gelatification-reduction process

“…When Mo-Cu compacts are sintered at 1050 • C, a temperature lower than melting point of copper, sintering densification of the compacts is related to the solid-state sintering. The intensity of the solid-state densification mainly depends on the mean size of the particles [18,19]. Ultra-fine and well-dispersed Mo-Cu powders are obtained in this work, which is beneficial to sintering densification.…”