Journal of Materials Science

, Volume 26, Issue 23, pp 6491–6495 | Cite as

Microstructure and mechanical properties of cordierite ceramics toughened by monoclinic ZrO2

  • Young-Jei Oh
  • Tae-Sung Oh
  • Hyung-Jim Jung
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Abstract

The effects of m-ZrO2 addition on the mechanical behaviour of the cordierite ceramics were studied. Below 10 vol % of m-ZrO2 content, zircon (ZrSiO4) was formed as a second phase at the expense of all m-ZrO2 due to the reaction between ZrO2 and silica in the cordierite. The sintered density was improved with ZrO2 addition through glass phase formation along grain boundaries, and maximum sinterability was obtained at 4.6 vol % m-ZrO2. When sintered at 1300 °C for 4 h, the flexural strength at 4.6 vol % ZrO2 was 190 MPa, compared with 55 MPa for the pure cordierite. Fracture toughness was gradually enhanced from 1.75 MPa m1/2 to 2.4 MPa m1/2 with m-ZrO2 addition up to 10 vol %, which could be explained partly by thermal expansion mismatch between cordierite and the second-phase ZrSiO4 and partly by crack deflection at the cordierite-ZrSiO4 interfaces.

Keywords

Microstructure Zircon Thermal Expansion Expense Fracture Toughness 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Chapman & Hall 1991

Authors and Affiliations

  • Young-Jei Oh
    • 1
  • Tae-Sung Oh
    • 1
  • Hyung-Jim Jung
    • 1
  1. 1.Division of CeramicsKorea Institute of Science and TechnologyCheongryang, SeoulKorea

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