Mullite/cordierite laminates with β→α cristobalite transformation weakened interphases

Waltraud M Kriven, Sang Jin Lee

Research output: Contribution to journalConference articlepeer-review

Abstract

Laminates of β-cristobalite and mullite/cordierite mixtures in 60:40 wt% respectively were tape cast and hot pressed. The β-cristobalite form, chemically stabilized with Ca2+ and Al3+ stuffing cations, was prepared by the solution-polymerization route employing PVA solution as the polymeric carrier. The critical grain size of β-cristobalite for transformation and fracture behavior was investigated with laminates densified by hot-pressing at different thickness ratios between mullite/cordierite and β-cristobalite. The grain size was controlled by annealing at 1300 °C. A load-deflection curve for hot pressed samples annealed for 10 h showed a significant work of fracture (2.38 kJ/m2) with a strength of 131 MPa at the thickness ratio of cristobalite to the mullite/cordierite layer of 1:5. A low strength in spite of increasing work of fracture above a critical grain size of 4 μm was attributed to the crack deflection by microcracks in the transformation weakened cristobalite layer.

Original languageEnglish (US)
Pages (from-to)305-316
Number of pages12
JournalCeramic Engineering and Science Proceedings
Volume19
Issue number3
StatePublished - Dec 1 1998
EventProceedings of the 1998 22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A. Part 1 (of 2) - Cocoa Beach, FL, USA
Duration: Jan 20 1998Jan 24 1998

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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