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<p>Ceramic oxides of Y<sub>2</sub>O<sub>3</sub>(Y), Y<sub>2</sub>O<sub>3</sub>-50Al<sub>2</sub>O<sub>3</sub>(YA), Y<sub>2</sub>O<sub>3</sub>-50TiO<sub>2</sub> (YT), Y<sub>2</sub>O<sub>3</sub>-50Cr<sub>2</sub>O<sub>3</sub>(YC) (in weight%) are fabricated by mechanical alloying for 20&#xa0;h, followed by hydrogen sintering at 1300&#xa0;°C with a holding time of 30&#xa0;min. The powder microstructure at 20&#xa0;h of milling is investigated by high-resolution transmission electron microscope (HRTEM). No distortion and shrinkage of the samples sintered in the hydrogen atmosphere have been observed. The x-ray diffraction study reveals the presence of mixed oxide Al<sub>5</sub>Y<sub>3</sub>O<sub>12</sub>, Y<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub>, YCrO<sub>3</sub> in YA, YT, YC samples, respectively. Maximum relative sintered density of 89.98% has been achieved in YT sample. YT sample also records the highest microhardness (644.66 ± 34.26 HV) and the minimum specific wear rate (0.12 × 10<sup>-2</sup> mm<sup>3</sup>/N. m) is attained in YC sample. High-temperature oxidation study at 1000&#xa0;°C at 10&#xa0;h also illustrates minimum weight change and maximum oxidation resistance in YT samples attributed to the lowest porosity. The present study cites the suitability of ceramic oxides for high-temperature sustainability.</p>

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Fabrication of Nanostructured Y2O3, Y2O3-Al2O3, Y2O3-TiO2, Y2O3-Cr2O3 Ceramic Oxides for Structural Applications

  • 期刊论文

  • 发表日期：

    2025年5月7日

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  • Sambit Swain,
  • Bhawesh Agrawal,
  • Anshuman Patra,
  • Mayadhar Debata

摘要

Ceramic oxides of Y2O3(Y), Y2O3-50Al2O3(YA), Y2O3-50TiO2 (YT), Y2O3-50Cr2O3(YC) (in weight%) are fabricated by mechanical alloying for 20 h, followed by hydrogen sintering at 1300 °C with a holding time of 30 min. The powder microstructure at 20 h of milling is investigated by high-resolution transmission electron microscope (HRTEM). No distortion and shrinkage of the samples sintered in the hydrogen atmosphere have been observed. The x-ray diffraction study reveals the presence of mixed oxide Al5Y3O12, Y2Ti2O7, YCrO3 in YA, YT, YC samples, respectively. Maximum relative sintered density of 89.98% has been achieved in YT sample. YT sample also records the highest microhardness (644.66 ± 34.26 HV) and the minimum specific wear rate (0.12 × 10-2 mm3/N. m) is attained in YC sample. High-temperature oxidation study at 1000 °C at 10 h also illustrates minimum weight change and maximum oxidation resistance in YT samples attributed to the lowest porosity. The present study cites the suitability of ceramic oxides for high-temperature sustainability.