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- W2555486142 abstract "Scopul lucrarii il reprezinta sinteza si caracterizarea unor pulberi ceramice de zircona total stabilizata cu Y2O3 (8%) si de alumina, obţinute prin metoda (co)precipitarii, din cloruri metalice corespunzatoare. Ca solvenţi s-au folosit apa si etanolul, iar pentru precipitare, pH-ul soluţiei a fost variat, prin folosirea de amoniac. Valorile de pH considerate au fost 7,5, 10,5 si 12,5. Precipitatele obţinute au fost uscate la 80°C, timp de 24 de ore si ulterior calcinate la 350°C, timp de 2 ore. Pulberile au fost evaluate prin analize termice diferenţiale, prin difracţie de raze X, prin microscopie electronica de baleaj si transmisie. In cazul pulberilor de 8YSZ, difractogramele de raze X atesta prezenţa ZrO2 tetragonal, iar pentru pulberea de alumina, pe lânga γ-Al2O3 alumina se deceleaza si δ-Al2O3. Din imaginile TEM se observa ca granulele de ZrO2 tetragonal prezinta o morfologie aproape sferica, particulele având dimensiuni cuprinse intre 5 nm si 12 nm. De asemenea s-a observat ca cea mai buna condiţie de obţinere a nanopulberilor a fost, utilizarea apei ca solvent si asigurarea unui pH bazic de 12,5. The paper’s aim was to prepare and characterize ceramic powders of fully stabilized zirconia (with 8 mol% yttria), and alumina, obtained through co-precipitation starting from the corresponding chlorides. Coprecipitation was taken using water or ethanol as a solvent and considering the pH influence (7.5, 10.5 and 12.5 obtained by using ammonia solution) upon precipitation was analyzed. The obtained powders were dried at 80 °C for 24 h and afterwards calcinated at 350°C for 2 hours. The powders were evaluated through thermal analysis, X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The XRD results show that 8YSZ calcinated powders is a tetragonal ZrO2 and, concerning alumina powder, besides γ-Al2O3, δ-Al2O3 was identified. The TEM examination shows that the tetragonal ZrO2 has a spherical like morphology with a size ranging from 5 nm to 12 nm. Also, it was observed that the best condition for nanopowders obtaining was using as solvent water and a pH value of 12.5." @default.
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- W2555486142 date "2011-01-01" @default.
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- W2555486142 title "INFLUENŢA CONDIŢIILOR DE PREPARARE ASUPRA CARACTERISTICILOR NANOMETRICE ALE PULBERILOR DE ZIRCONĂ ŞI ALUMINĂ INFLUENCE OF PREPARATION CONDITIONS ON NANOMETRIC CHARACTERISTICS OF ZIRCONIA AND ALUMINA POWDERS" @default.
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