Using ion exchange to control the mechanical strength of Naβ-alumina ceramics

Akira Kishimoto, Masahito Morita, Hiroshi Asaoka, Hidetaka Hayashi

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


We employed Naβ-alumina ceramics as a candidate of structural material of which strength can be controllable. Mechanical strength of Naβ-alumina ceramics revealed to be enhanced up to 50% by ion exchange of Na+ by larger K+. Maximum mechanical strength was as large as 450 MPa that can be easily degraded by simple annealing at moderate temperature. Such large strength maintained on service could make it useful as structural material. Furthermore it is advantageous for recycling because it can be easily broken after annealing. The increase in mechanical strength on ion exchange was not dependent on the composition of β-alumina but dependent on the internal stress developed due to the difference in the cation sizes. After showing maximum strength, prolonged ion exchange time leads to strength degradation due to the crack generation. When NaK-β-alumina ceramics was used instead of Naβ-alumina, ion exchange time showing maximum strength and degree of strength degradation had been changed.

Original languageEnglish
Pages (from-to)949-953
Number of pages5
JournalSolid State Ionics
Issue number9-10
Publication statusPublished - Mar 31 2006


  • Ceramics
  • Exchange interaction
  • Residual stresses
  • Stress relaxation

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


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