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National Repository of Grey Literature 2 records found  Search took 0.00 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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Objemový nanokrystalický keramický materiál připravený plazmovým stříkáním
 Chráska, Tomáš ; Neufuss, Karel ; Rohan, Pavel ; Dubský, Jiří
Ceramic material based on alumina-zirconia mixture have been successfully plasma sprayed by water stabilized plasma torch (WSP®). The material is composed of three main compounds Al2O3, ZrO2, and SiO2 where the ratio of Al2O3 – ZrO2 compounds is close to the ratio in their respective eutectic alloy. The material is a refractory and exhibits very high hardness, abrasion resistance, and chemical resistance. Cast tiles of the original material were ground and sieved to obtain the right powder cut size for plasma spraying by WSP®. Both thick coatings and free standing parts with very low open porosity were easily achieved by WSP®. The feedstock powder is mostly crystalline whereas the as?sprayed material is mostly amorphous with some unmelted crystalline particles present. Electron microscopy and X-ray diffraction were employed to determine microstructure, crystallinity, and phase content of the bulk samples as well as individual splats.
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