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- Title
Improvement of sinterability of barium dititanate powders by ball-milling.
- Authors
Peng, Jian; Wang, Chuanbin; Li, Ling; Wang, Fang; Shen, Qiang; Zhang, Lian-meng
- Abstract
In the present study, high-energy ball-milling technique was applied to barium dititanate (BaTiO) powders. The improvement in sinterability of the ball-milled powders was evidenced, as compared with the sintering behavior of unmilled powders. After ball-milling, BaTiO coarse powders were effectively ground into fine ones, whose maximum particle size was decreased from ~400 to ~40 μm and about 20 vol% nano-scaled particles were produced. After further consolidation by spark plasma sintering at 1,323 K, almost fully dense BaTiO ceramics (97.7% theoretical density) with a compact structure was obtained. But for BaTiO coarse powders, the ceramics with high densification was difficult to obtain even after being sintered at a high temperature of 1,423 K, whose relative density was only 90.5%. The room temperature permittivities and dielectric losses at 1 MHz of the BaTiO ceramics derived from fine powders and coarse powders were 32.9, 0.034 and 26.7, 0.053, respectively. The permittivity of BaTiO ceramics sintered from fine powders reached a maximum value (ε′ = 240, 100 kHz) at the Curie temperature of ~730 K,which was larger than that sintered from coarse powders (ε′ = 175, 100 kHz) due to lower porosity. The present work proved that high-energy ball-milling is a feasible way to improve the sinterability of BaTiO powders.
- Subjects
SINTERING; BALL mills; PERMITTIVITY; POROSITY; BARIUM
- Publication
Journal of Materials Science: Materials in Electronics, 2012, Vol 23, Issue 3, p706
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-011-0475-x