R-curve behavior and flexural strength of zirconia-toughened alumina and partially stabilized zirconia composite laminates

Diego Blaese, Tobias Benitez, Marcelo Barros, Hans Jelitto, Nahum Travitzky, Dachamir Hotza, Rolf Janssen

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

A composite-laminate formed by thick layers (~ 320 µm) of zirconia-toughened alumina (ZTA) with thin (~ 50 µm) interlayers of zirconia partially stabilized (Y-PSZ) has been fabricated by tape casting and pressureless sintering. Fracture behavior and strength has been investigated and compared to a “monolithic” reference, e.g. a stack of zirconia-toughened alumina (ZTA) without interlayers. The fracture behavior has been analysed using stable crack growth in V-notched specimens loaded in 3-point bending. The ZTA+Y-PSZ composite laminate presented a rising crack resistance with maximum values between 6 and 14 MPa m1/2. In contrast, the “monolithic” ZTA laminate shows a plateau R-curve behavior at 2.7 MPa m1/2. Several toughening mechanisms were identified in the ZTA+Y-PSZ composite laminate, such as, crack arrest/slow down, micro cracking and bifurcation. These toughening mechanisms are most likely caused by high tensile residual stresses that were estimated theoretically.

Original languageEnglish
Pages (from-to)13463-13468
Number of pages6
JournalCeramics International
Volume44
Issue number12
DOIs
Publication statusPublished - 15 Aug 2018
Externally publishedYes

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Keywords

  • Optimizing laminate design
  • R-curve
  • Reliability
  • Toughening mechanisms

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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