Effect of nanometer Al2O3 powder on microstructure and properties of alumina ceramics by microwave sintering

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 546; pp. 328 - 331
• Main Authors: Liu, Yin, Min, Fan-fei, Zhu, Jin-bo, Zhang, Ming-xu
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 01.06.2012; Elsevier
• Subjects: Alumina; Condensed matter: structure, mechanical and thermal properties; Deformation and plasticity (including yield, ductility, and superplasticity); Exact sciences and technology; Mechanical and acoustical properties of condensed matter; Mechanical properties; Mechanical properties of solids; Microstructure; Microwave sintering; Nanometer powder; Physics; Mechanical properties; Nanometer powder; Microwave sintering; Microstructure; Alumina; Grain size; Aluminium oxide; Scanning electron microscopy; Inorganic compounds; Densification; Fracture toughness; Nanocomposites; Flexural strength; Nanopowder; Rupture strength
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2012.03.072

► High quality alumina ceramics were fabricated by microwave sintering using nanometer and coarse grain Al2O3 as raw materials. ► Nanometer Al2O3 powder addition can improve the sinterability and mechanical properties of the alumina ceramics. ► This kind of performance improvement can be obtained only when the content of nanometer Al2O3 is in a certain amount. ► The maximum mechanical properties of microwave sintered alumina ceramics can be obtained up to 294.41Mpa and 4.14Mpam1/2. ► Nanometer Al2O3 powder and microwave sintering process resulted in a synergistic effect on its microstructure and mechanical properties. The effect of nanometer Al2O3 powder on microstructure and properties of alumina ceramics by microwave sintering was investigated. The maximum bending strength and fracture toughness of alumina ceramics reach up to 294.41Mpa and 4.14Mpam1/2, as the alumina ceramics with 20wt% nanometer A12O3 powder was microwave sintered at 1500°C for 30min. It may be attributed to the addition of nanometer A12O3 powder and microwave-sintering process resulting in a synergistic effect on improvement of microstructure and mechanical properties.