Effect of Dynamic Compaction on the Retention of Tetragonal Zirconia and Mechanical Properties of Alumina/Zirconia Composites

Murat Bengisu, Osman T. Inal, John R. Hellmann

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5 Scopus citations

Abstract

Dynamic consolidation techniques were employed to investigate the retention of tetragonal zirconia and degree of consolidation in alumina/zirconia powder compacts. Heating the specimens prior to explosive shock compaction increased the tetragonal‐phase retention significantly. Low shock pressures yielded no macrocracking, although final densities were low (60% to 70% of the theoretical density). Heat treatment following dynamic consolidation enhanced the retention of the tetragonal zirconia polymorph regardless of the shock pressure employed. Compact densities were increased to over 90% of theoretical at relatively low sintering temperatures (1300°C). Hardness, toughness, and Young's modulus of the compacts were comparable to those achieved in composites that were synthesized using more conventional techniques. Dynamic compaction offers an alternative method for the fabrication of zirconia‐toughened alumina ceramics.

Original languageEnglish (US)
Pages (from-to)346-351
Number of pages6
JournalJournal of the American Ceramic Society
Volume73
Issue number2
DOIs
StatePublished - Feb 1990

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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