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A new method was developed to prepare rare earth oxide dispersion tungsten powder, and some sintering characteristics of the powder were investigated. The results are as follows :(1) Rare earth oxide dispersion tungsten powder can be prepared by spraying an acetic acid aqueous solution of ammonium tungstate para pentahydrate and lanthanum (III) oxide.(2) Rare earth oxide is dispersed as fine particles in tungsten matrices of sintered specimens. This finding contrasts with the fact that the conventional V-Blender mixing gives sintered specimens in which rare erath oxide is dispersed as coarse particles at the grain boundaries. Therefore, the spray dry method is a hopeful process to produce rare earth oxide dispersion tungsten alloys.

Preparation of Rare Earth Oxide Dispersion Tungsten Powder by Spray Dry Method and It's Sintering.