Comparison of the Microwave and Conventional Sintering of Alumina: Effect of MgO Doping and Particle Size. Issue 6 (2nd May 2013)

• Record Type: Journal Article
• Authors: Zuo, Fei; Carry, Claude; Saunier, Sébastien; Marinel, Sylvain; Goeuriot, Dominique; Bordia, R.
• Is Part Of: Journal of the American Ceramic Society. Volume 96:Issue 6(2013)
• Page Start: 1732
• Page End: 1737
• Publication Date: 2013-05-02
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.12320
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" xml:lang="en" id="jace12320-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>The effects of MgO doping and specific surface area of powder on microwave sintering behavior of α‐Al₂O₃ were investigated. A comparative study was simultaneously achieved in conventional and microwave heating with an identical thermal process. The experimental results show that both MgO and particle size have significant influence on microwave enhancement in the densification of the alumina samples. It is found that an amount of MgO surrounding the solubility limit in Al₂O₃ or leading to second phase precipitation of MgAl₂O₄ spinel induces more significant microwave enhancement. A significant microwave gain in densification is also observed while powder has a high specific surface area. These results indicate that the enhancements during microwave sintering processes are associated with the formation of lattice defect and with the increase in concentration of grain‐boundary region.</p> </abstract>