Spark plasma reaction sintering of ZrO2-mullite composites from plasma spheroidized zircon/alumina powders
Khor, Khiam Aik
Yu, L. G.
Munir, Z. A.
Date of Issue2003
School of Mechanical and Aerospace Engineering
Mullite-zirconia ceramic composites are prepared by reaction sintering of plasma spheroidized (PS) zircon-alumina powders in a spark plasma sintering (SPS) system at 1000, 1100, 1200 and 1300 °C with duration of 10 and 30 min. At SPS temperature of 1000 °C, evidence of zircon decomposition is detected, while at 1200 °C, mullite formation dominates the process, resulting in significant increases in microhardness, Young’s modulus and fracture toughness values. At SPS temperature of 1300 °C, due to recrystallization, rapid grain growth, and intergranular micro cracking, there is a slight decrease of microhardness and Young’s modulus values. Yet, fracture toughness as high as 11.2±1.1 MPa m1/2 is obtained by the indentation technique. The results indicate that with optimized sintering parameters, a combination of PS and SPS is effective in preparing high performance mullite/ZrO2 composites from zircon/alumina mixtures at a relatively low reaction sintering temperature.
Materials science and engineering A
© 2003 Elsevier. This is the author created version of a work that has been peer reviewed and accepted for publication by Materials Science and Engineering A, Elsevier. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [DOI: http://dx.doi.org/10.1016/S0921-5093(02)00151-X]