Effects of Al2O3 Nano-Particulates Addition on Barium Titanate Ceramics
Sukanda Jiansirisomboon*, Anucha Watcharapasorn and Tawee Tunkasiri* Author for corresponding; e-mail address: sukanda@chiangmai.ac.th
Volume :Vol.33 No.2 (MAY 2006)
Research Article
DOI:
Received: 5 January 2006, Revised: -, Accepted: 1 May 2006, Published: -
Citation: Jiansirisomboon S., Watcharapasorn A. and Tunkasiri T., Effects of Al2O3 Nano-Particulates Addition on Barium Titanate Ceramics, Chiang Mai Journal of Science, 2006; 33(2): 175-182.
Abstract
BaTiO3/xAl2O3 nanocomposite ceramics (where x = 0, 3, 5, 10 and 15 mol%) were fabricated from commercially available BaTiO3 powder and Al2O3 nano-powder using a simple solid-state mixed oxide method. The densities of the composite ceramics decreased with increasing content of Al2O3 dispersoid. Phase characterization by XRD suggested the reaction between BaTiO3 and Al2O3 occurred during sintering and resulted in BaAl2O4 and Ba4Ti10Al2O27 phases. Microstructures of the composite ceramics showed different grain morphologies with a decrease in grain size as the Al2O3 content increased. Knoop hardness showed the values between 3.63-5.42 GPa. The maximum hardness was achieved in the BaTiO3/15mol% Al2O3 ceramic. In this investigation, the hardness tended to be affected by the degree of dispersion and the content of Al2O3 addition.