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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.123  No.1438 (June) (2015)  >  pp.465-468

Journal of the Ceramic Society of Japan
<<Previous article Vol.123  No.1438 (June) (2015)   pp.465 - 468 Next article>>

Enhancement of sintering rates in BaTiO3 by controlling of DC electric current

Akinori UEHASHI1), Hidehiro YOSHIDA2), Tomoharu TOKUNAGA1), Katsuhiro SASAKI1), Takahisa YAMAMOTO1)
1) Nagoya University, Department of Quantum Engineering 2) National Institute for Materials Science

DC electric fields ranged from 25 to 350 V/cm enhanced the sintering rates of BaTiO3. At the field of 25 V/cm, the sintering densification occurred by field-assisted sintering (FAST), and flash-sintering preceded by FAST was observed at the field strength of more than 75 V/cm. Most of the densification, however, was produced by the FAST process. At high field strength of more than 250 V/cm, the sintering densification was not finished owing to discharging during the flash-sintering. By means of FAST process at 100 V/cm and the current limit of 100 mA, in contrast, relative density of 97% and a fine grain size about 500 nm were achieved at 1020°C in the present material. The FAST process, where the electric current was set to the transition current between FAST and flash-sintering, is highly effective to fabricate uniform and fine grained BaTiO3 polycrystal.


Keyword:
Flash sintering, BaTiO3, Sintering, Fast, HRTEM

Received: January 06, 2015
Accepted: March 18, 2015 , Published online: June 01, 2015

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