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01-11-2020 | Research and Development | Issue 6/2020

Interceram - International Ceramic Review 6/2020

Effect of Zr4+ Dopant on Microstructure, Densification and Thermomechanical Behaviour of ZnAl2O4 Spinel

Journal:
Interceram - International Ceramic Review > Issue 6/2020
Authors:
P. K. Haldar, T.K. Parya, S. Mukhopadhyay
Abstract: ZnAl 2O 4 spinel precursor powders (mole ratio ZnO : Al 2O 3 = 1 : 1) doped with 0.5-2.0 mass-% Zr 4+ ions were synthesized by the coprecipitation route. The derived powders were uniaxially pressed into cylindrical pellets and sintered at 1350 °C for 1 h. The sintering behaviour, phase assemblage and microstructure of fired ZnAl 2O 4 ceramics doped with different concentrations of Zr 4+ were investigated. Sintered density above 97 % of the theoretical density of pure ZnAl 2O 4 ceramics was achieved with the addition of 2.0 % Zr 4+ . The residual flexural strength of the sintered body was as high as 120 kg.cm -2 for the highest addition of Zr 4+, and it was higher than that of the Ti 4+ doped ZnAl 2O 4. The powder XRD patterns of sintered compacts revealed that besides ZnAl 2O 4 spinel as the major crystalline phase, a minor amount of tetragonal ZrO 2 phase is also present when the dopant quantity is higher. The SEM micrographs of the fractured surfaces of the sintered body demonstrated a coherent and uniform microstructure with a homogeneous distribution of microfine grains with Zr 4+-doped ZnAl 2O 4 compacts. ...

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