Effect of Magnesia Addition on the Densification and Mechanical Properties of Zinc Aluminate Ceramic

Authors

  • Buzhe CUI Taiyuan University of Science and Technology
  • Jianying HAO Taiyuan University of Science and Technology https://orcid.org/0000-0001-5287-9799
  • Zhenguo ZHU Chinese Academy of Science
  • Shuo BAI Chinese Academy of Science
  • Jianguo WU Taiyuan University of Science and Technology

DOI:

https://doi.org/10.5755/j02.ms.39605

Keywords:

zinc aluminate ceramic, mechanical property, densification, magnesia

Abstract

Zinc aluminate (ZnAl2O4) ceramic has attracted more and more attention because of its superior properties. ZnAl2O4 ceramic was successfully synthesized via solid-state reaction sintering using alumina and zinc oxide as raw materials and magnesia as an additive. The phase composition and microstructure of sintered samples were characterized by XRD and SEM. The densification of ZnAl2O4 ceramic containing 2.5 % magnesia is significantly improved, 6.01 % of apparent porosity and 4.1 g/cm3 of bulk density. Additionally, the flexural strength achieves the maximum of 198.7 MPa, which is 91.2 % higher than that without magnesia addition. During sintering, Mg2+ can substitute Zn2+ to form (MgxZn1-x)Al2O4 spinel, promoting the development and growth of ZnAl2O4 grains and making the structure denser. The free Zn2+ can inhibit grain boundary migration and locally refine grains, resulting in an increase of the strength.

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Published

2025-03-31

Issue

Early Access

Section

Articles

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