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National Repository of Grey Literature 1 records found  Search took 0.01 seconds. 
Objemové nanokrystalické materiály na bázi oxidu hlinitého a zirkoničitého
 Chráska, Tomáš ; Klementová, Mariana
An alternative method to produce bulk nanocrystalline materials is to produce amorphous material by rapid solidification and then by controlled crystallization introduce nanocrystalline structure. One technique capable of achieving rapid solidification in materials is plasma spraying. Feedstock material for plasma spraying was composed of about 15 wt.% of SiO2 in addition to the near eutectic ratio of Al2O3 and ZrO2 compounds. Amorphous coatings and free standing parts from this material prepared by water stabilized plasma torch (WSP) exhibit very low porosity and high hardness. When heat treated, the as-sprayed material crystallizes just above 950ºC with an associated volume shrinkage of 1.8%. The volume shrinkage does not cause material breakup. Short heat treatment of the as-sprayed material produces a very fine nanocomposite structure within each splat. Each splat contains nanocrystallites with average size as small as 13 nm.
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