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

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

Research output: Contribution to journalConference articlepeer-review

7 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)31-38
Number of pages8
JournalCeramic Transactions
Volume165
Publication statusPublished - 2005 Aug 23
Event106th Annual Meeting of the American Ceramic Society - Indianapolis, IN, United States
Duration: 2004 Apr 182004 Apr 21

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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