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LJournal of Alloys and Compounds 334 (2002) 118130 www.elsevier.com/locate/jallcom
 

Summary: LJournal of Alloys and Compounds 334 (2002) 118130
www.elsevier.com/locate/jallcom
On the development of high density barium metazirconate (BaZrO )3
ceramics
1
*Abdul-Majeed Azad , Selvarajan Subramaniam , Teng Wan Dung
Advanced Materials Research Center, Ceramics Technology Center, SIRIM Berhad, 1 Persiaran Dato' Menteri, Section 2, 40911 Shah Alam,
Selangor, Malaysia
Received 29 June 2001; received in revised form 20 July 2001; accepted 23 July 2001
Abstract
A simple, economically viable and easily scaleable technique for the bulk synthesis of phase-pure barium metazirconate (BaZrO ) is3
described. An equimolar ball-milled mixture of barium and zirconyl nitrates yielded fine-grained single-phase BaZrO powder after a3
single-stage calcination at 8008C. The cubic perovskite structure was found to be stable up to 17008C, the maximum sintering temperature
employed in this work. Pure BaZrO compacts with bulk density $90% of theoretical were successfully obtained using a two-stage3
sintering profile. Benign/deleterious effects of three sintering aids (viz. Al O , MgO and Y O ) in terms of densification, shrinkage and2 3 2 3
microstructural variation in BaZrO were also evaluated. 2002 Elsevier Science B.V. All rights reserved.3
Keywords: Ceramics; Chemical synthesis; Sintering; SEM
1. Introduction for the much investigated yttria-stabilized zirconia (YSZ)
as a thermal barrier coating (TBC) material for supersonic
Barium metazirconate (BaZrO ) is a value-added ma- jets by aerospace industries [5]. Keeping in line with the3

  

Source: Azad, Abdul-Majeed - Department of Chemical and Environmental Engineering, University of Toledo

 

Collections: Materials Science; Energy Storage, Conversion and Utilization