Journal of the Australian Ceramic Society, Volume (59), No (3), Year (2023-7) , Pages (739-749)

Title : ( The role of ZnO as an additive on the mechanical properties of zirconia-mullite composites )

Authors: Pooneh Barfi sistani , Sahar Mollazadeh Beidokhti , Ali Reza Kiani Rashid ,

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Abstract

This study investigates the effects of ZnO addition on the physicochemical and mechanical properties of zirconia-mullite composites. Zirconia-mullite composites containing varying amounts of ZnO (0–15 wt.%) were fabricated by sintering the mechanically activated gibbsite-zircon-kaolinite mixtures at 1550 °C. The results demonstrated the positive effect of adding up to 5 wt.% ZnO on optimizing the phase composition, surface characteristics, and mechanical properties of the fabricated composites. The stabilization of the tetragonal zirconia phase and the formation of the acicular mullite phase were positively affected by the presence of ZnO, as determined by X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses. The composites\\\' flexural strength and diametral tensile strength (DTS) were increased from 65 to 155 MPa and 42 to 124 MPa, respectively, due to the stabilization of monoclinic zirconia and the formation of acicular mullite. Furthermore, a fracture toughness and Vickers microhardness of 4.67 ± 0.97 MPa.m1/2 and 8 GPa were achieved in the composite containing 5 wt.% ZnO, respectively.

Keywords

, Zirconia, mullite composite ZnO Flexural strength Fracture toughness
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@article{paperid:1096609,
author = {Barfi Sistani, Pooneh and Mollazadeh Beidokhti, Sahar and Kiani Rashid, Ali Reza},
title = {The role of ZnO as an additive on the mechanical properties of zirconia-mullite composites},
journal = {Journal of the Australian Ceramic Society},
year = {2023},
volume = {59},
number = {3},
month = {July},
issn = {2510-1560},
pages = {739--749},
numpages = {10},
keywords = {Zirconia-mullite composite ZnO Flexural strength Fracture toughness},
}

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%0 Journal Article
%T The role of ZnO as an additive on the mechanical properties of zirconia-mullite composites
%A Barfi Sistani, Pooneh
%A Mollazadeh Beidokhti, Sahar
%A Kiani Rashid, Ali Reza
%J Journal of the Australian Ceramic Society
%@ 2510-1560
%D 2023

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