Grain size influence on the thermal properties of stabilized zirconia-nano spinel (Al2O3-MgO) composites
Message:
Abstract:
Abstract. Cubic crystalline oxides such as Y2O3 and MgO is used to stabalized zirconia phases at high temperature. In this paper the Y2O3 powder was added to stabilized zirconia and preparing a mixture of MgAl2O4 Spinel by mixing 1mol of nano-MgO with 1 mol of nano-Al2O3 powders. The spinel was added to the Y2O3-ZrO2 by various weight percentage (5, 10, 15, 20 and 25 wt%), and after that the specimens was prepared by axial pressing and sintered at 1550 oC for 4 hours as soaking time. The grain size was tested by using Atomic Force Microscopy (AFM) and calculated for surface of specimens and it was found to be decreasing (> 0.6 µm) to (~ 108 nm). The thermal properties were clearly influenced by the structural characteristics of the MAS. The thermal conductivity and thermal diffusion was decreased slightly from 5.7 to 5.5 W/m.K and from 2.5 to 1.5 mm2/s, respectively. The thermal capacity was increased from 483 to 615 J/kg.K, and thermal expansion coefficient was increased from 10 to 7.510-6 oC-1 due to the compatibility of thermal expansion coefficients of (Y-PSZ)-MAS oxides. Thermal properties values are compatible with thermal insulation requirements in energy storage applications.
Article Type:
Research/Original Article
Language:
English
Published:
Journal of Nano Structures, Volume:9 Issue:4, 2019
Pages:
776 - 783
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