Our website is currently undergoing maintenance. Article records and full texts remain available. Submissions can be made through the Editorial Manager.

Zirconia-Mullite Obtained from Co-Precipitated Zirconia-Mullite Composite Powders by SPS

H.Z. Li, Z.J. Li, X.D. Luo, J.Y. Gui, Z.P. Xie

Journal of Ceramic Science and Technology, Vol. 7, No. 4 (2016), pp. 417-422

DOI: 10.4416/JCST2016-00059

Download full article (PDF)

Abstract

The co-precipitation method is used to fabricate precursor powder. This powder is densified by means of the spark plasma sintering (SPS) technique at 1500 °C with a holding time of 7 min to prepare zirconia-mullite samples. Their density measures up to 97 % of the theoretical density, and the sintered mullite compacts exhibit better strength properties (289 ± 12 MPa) and Hv (9.99 GPa). The mode of fracture is changed with the addition of ZrO2 and extensive fine cleavages are observed on the grain surface. These cleavages join together to form steps, which can absorb more energy. The flexural strength of the samples is almost double that of pure mullite, which is related to the formation of cleavages.

Keywords

Zirconia-mullite, co-precipitation, flexural strength, Vickers hardness, microstructure

View this issue · Article & DOI index