Preparation and characterization of ceria magnesium aluminate nano powder for thermal barrier application

Abstract

The present work deals with the preparation of CeMgAl11O19 nano powder by sol gel citric acid route and to investigate its structural, surface and thermo-mechanical properties, to access its suitability for thermal barrier application. The XRD profile of the CeMgAl11O19 powder heat treated at different temperatures confirms polycrystalline structure. From the XRD data, mean grain size, lattice strain energy, dislocation density and other structural parameters have been investigated and reported. Thermal properties of the as synthesized CeMgAl11O19 powder have been studied from the TG-DTA and DSC measurement and the results are presented. Thermal conductivity of the CeMgAl11O19 specimen heat treated at different temperatures has been evaluated using the physical property measurement system and the results have been discussed. Hardness of the pelletized CeMgAl11O19 specimen heat treated at different temperatures has been measured in the Vickers scale and the results have been discussed. The influence of annealing temperature on the tensile strength and wear resistance of the CeMgAl11O19 specimen have been investigated and reported. The 2D and 3D AFM image of the CeMgAl11O19 specimen heat treated at 750°C shows the uniform surface pattern without any dark pits and pinholes. The surface roughness and grain size evaluated from the AFM data have been analyzed and presented.