Thermo-mechanical properties of mullite/zirconia reinforced alumina ceramic composites

• Published in: Materials in engineering 2012-10, Vol.41, p.31-36
• Main Authors: Wahsh, M.M.S., Khattab, R.M., Awaad, M.
• Format: Article
• Language: English
• Subjects: A. Composites; Aluminum oxide; C. Sintering; Ceramics; Densification; E. Mechanical; Firing; Mechanical properties; Scanning electron microscopy; Shock resistance; Sintering; Vickers microhardness
• ISSN: 0261-3069
• DOI: 10.1016/j.matdes.2012.04.040

[Display omitted] ► Alumina–mullite–zirconia ceramic composites were prepared from alumina and zircon. ► Constant amount of magnesia was added as a sintering aid. ► Mechanical properties were enhanced with increasing of zircon up to 30.52mass%. ► All of ceramic composites were achieved excellent thermal shock resistance. Alumina–mullite–zirconia ceramic composites were prepared by reaction bonding of alumina and zircon mixtures after firing at different temperatures 1300°, 1400° and 1500°C. Constant amount of magnesia was added as a sintering aid. The technological parameters of the sintered ceramic composites, i.e. the mechanical properties and densification parameter as well as thermal shock resistance, have been investigated. The phase compositions and microstructure of the sintered ceramic composites were detected by using X-ray diffraction (XRD) and scanning electron microscopy (SEM). Results indicated that alumina–mullite–zirconia ceramic composites fired at 1500°C for 2h were achieved a good densification parameters and mechanical properties as well as excellent thermal shock resistance. In addition, these ceramic composites were showed enhancement in Vickers’ microhardness and fracture toughness values.