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National Repository of Grey Literature 1 records found  Search took 0.01 seconds. 
Morphology and hardness of particles of titanium powder prepared by cryogenic milling
 Ibragimov, Ilya ; Stráský, Josef (advisor) ; Janeček, Miloš (referee)
The effect of cryogenic milling on morphology and microhardness of titanium powder was investigated. Initial powder of commercially pure titanium was subjected to cryogenic milling in liquid argon (LAr) using two different milling speeds. Prepared powders were subsequently cleaned by ethanol. The cleaning procedure was done in two ways: in the air and in the inert atmosphere in the glovebox. Particle size and morphology were investigated my scanning electron microscopy and subsequent automated image analysis. Microhardness of powder particles was determined by Vickers hardness measurement using small loads. The milling did not cause significant powder refiniment, while the shape of powder particles changes substantially. Milling speed affected particle shape and powder contamination. Application of stearic acid as the processing control agent prevented cold-welding of powder particles, but contaminated the powder by oxygen and hydrogen. Stearic acid could be successfully removed by cleaning in ethanol. The using of glovebox for cleaning did not have significant effect on the resultiing contamination.
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