Papers by Keyword: YAlO₃

Abstract: YCr_xAl_1-xO₃ nanoparticles were synthesized by a reverse micelle processing for inorganic pigment. Y(NO₃)₂·6H₂O, Cr (NO₃)₂·6H₂O and Al (NO₃)₃·9H₂O are used for precursors in order to synthesis YCr_xAl_1-xO₃ nanoparticles. The aqueous solution consists of mixing the molar ratio of Y/Cr/Al at 1:x:1-x and heat treated at 900~1300°C for 2h. The average size and distribution of synthesized YCr_xAl_1-xO₃ powders was in the range of 10-20nm and narrow, respectively. The average size of the synthesized YCr_xAl_1-xO₃ powders increased with increasing water to surfactant molar ratio and heating temperature. The crystallinity of synthesized YCr_xAl_1-xO₃ powder increased with increasing heating temperature. The synthesized YCr_xAl_1-xO₃ powders were characterized by X-ray diffraction analysis (XRD), field emission scanning electron microscopy (FE-SEM) and color spectrophotometer. The properties of the synthesized powders were affected by such variables as molar ratio, heating temperature etc.

Abstract: Nb, Al and Y2O3 powders were mechanically alloyed together with 5 wt% stearic acid. The heavy plastic deformation of the powders by mechanical alloying led significant hardening to 970 Hv and the reduced grain size to 10 nm. Nb-Al base ODS alloys consolidated by HIP at 1500 °C and 150 MPa for 0.5 h gave the dual phase of Nb solid solution and Nb3Al compound. The oxide particles are of the hexagonal type YAlO3 (YAH), with the size of 50 nm to 200 nm. The high-temperature ductility at 1200 °C and capability of the grain growth at 2000 °C were confirmed.