Synthesis of Nanocrystalline Co-W Alloys

Abstract

Electroplating is one of the most technologically advanced methods to synthesize nanophase materials both as coatings and in bulk form. This paper demonstrates the formulation of a processing “window” for nanocrystalline Co-W alloys using factorial design. The microstructural evolution from polycrystalline to nanocrystalline to amorphous Co-W microstructures is shown for electrodeposits produced from a bath containing cobalt sulphate, sodium tungstate, Rochelle salt and ammonium chloride. The effect of operating variables such as temperature and current density is discussed.

Electrodeposited Nanocrystalline Metals, Alloys, and Composites

“…[52] Electrodeposition of nanocrystals typically operates far from equilibrium conditions. [3,4] Similarly, extended solubility ranges were also observed in other alloys, such as Co-W, [23] or Zn-Ni. In addition, alloys produced by this method can show considerable extensions of the solid solubility range similar to what is observed in materials produced by other nonequilibrium processing routes, such as rapid solidification.…”

TRIBOLOGICAL EVALUATION OF ULTRAFINE Ti(CN) CERMETS

“…The presence of higher binder fraction in the microstructure of coarse Ti(CN) -25WC-20Ni (Fig. [20] On the other hand, in spite of the higher binder fraction as apparent from the microstructure (Fig.…”

Electrodeposited Nanostructured Films and Coatings: Synthesis, Structure, Properties and Applications

“…Ni [3][4][5], Co [6], Pd [7], Cu [6]), binary alloys (e.g. Ni-P [8,9], Ni-Fe [10], Zn-Ni [11], Pd-Fe [12], Co-W [13]) and ternary alloys (e.g. Ni-Fe-Cr [14,15]).…”