Electrical and mechanical properties of K, Ca ionic-conductive silicon nitride ceramics

Yoon Ho Kim, T. Sekino, T. Kusunose, T. Nakayama, K. Niihara, H. Kawaoka

研究成果: Conference article査読

7 被引用数 (Scopus)


The electrical conductivity was providing to structural ceramics by controlling the grain boundary phase. We focused on grain boundary phase of Si3N4 ceramics, which can be considered as infinite network for conducting path. The constituents of the conductive path in the sintered samples must be formed as a glassy grain boundary phase during sintering by melting. As the glassy phase, which does not have the particle shape, possesses the radius Rd around zero, it can be expected the critical volume fraction Φc is abruptly reduced compared with particle dispersion method generally used. In this study, we investigated the correlationship of microstructure, sinterability, mechanical properties and ionic conductivity of Si3N4 ceramics with alkali alminosilicate grain boundary phase. The result that ionic conductive Si 3N4 ceramics were fabricated by Pulse Electric Current Sintering (PECS) for controlled composition of grain boundary phase. Fabricated materials by PECS method was indicated very fine microstructure. The Si 3N4 ceramics had glassy phases between two matrix grains and in multiple grain boundaries, and showed three orders of magnitude higher conductivity than general silicon nitride ceramic.

ジャーナルCeramic Transactions
出版ステータスPublished - 2005
イベント106th Annual Meeting of the American Ceramic Society - Indianapolis, IN, United States
継続期間: 2004 4月 182004 4月 21

ASJC Scopus subject areas

  • セラミックおよび複合材料
  • 材料化学


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