The activated sintering and hot-pressing of electrowon tungsten powder
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Authors
Gourley, John W.
Issue Date
1966
Type
Thesis
Language
en_US
Keywords
Sintering , Viscous Flow , Evaporation , Condensation , Volume Diffusion , Surface Diffusion , Hot-pressing , Rearrangement Process , Solution-precipitation Process , Precipitation , Electrowon Powder , Liquid Nickel , Tungsten , Mackay Theses and Dissertations Grant Collection
Alternative Title
Abstract
The effects of time, temperature, powder blending, and additions of up to 1% ZrH and Ni on the hot-pressed density of electrowon powder were studied. Significant findings were: the large particle size and shape effectively prevented electrowon powder from sintering to a high density by hot-pressing at 4500 psi and 2300°C. Densities in excess of 90$ theoretical were obtained by blending up to 50 weight percent 2.7 micron tungsten powder with electrowon powder. ZrH was found to be a poor activating agent for the hot- pressing technique. Liquid nickel, present in amounts as small as 0.1 weight percent, significantly increased, the densification rate of tungsten compacts.
Description
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Citation
Publisher
University of Nevada, Reno
License
In Copyright(All Rights Reserved)