Effect of Rare Earth Y on Properties of Nanosized 90W-7Ni-3Fe Composite Powder Fabricated by Spray Drying-Hydrogen Reduction

Abstract EN

(W,Ni,Fe) composite oxide powder synthesized by spray drying was reduced at 700∘C for 90 minutes in H2 atmosphere.

The effect of rare earth Y on H2 reduction of (W,Ni,Fe) composite oxide powder was studied.

Phase composition, crystalline size, and particle morphology of the reduced powder have been measured by X-ray diffraction and scanning electron microscope (SEM).

Fsss particle size and special surface area of the reduced powder were also measured and analyzed.

The result showed that new phase Y(Ni0.75W0.25)O3 appeared in the reduced powder and particle morphology was nearly spherical or polyhedron by Y additions.

The higher the rare earth element content was, the bigger the influencing on particle morphology was.

When the rare earth Y content was under 0.8%, with the increase of the rare earth element content, dBET, Fsss, and crystal sizes of the reduced powder decreased greatly.