Effects of Low-Modulus BN Inclusions on Properties of Y-TZP Ceramic

A. S. Buyakov, Yu A. Mirovoy, S. P. Buyakova

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Abstract

Abstract: We investigate the structure and properties of ceramic based on tetragonal zirconia (Y-TZP) containing low-modulus inclusions of hexagonal boron nitride (h-BN). (Y-TZP)(h-BN) ceramic samples with low h-BN content exhibit increased fracture toughness (K1C). The highest fracture toughness was observed for (Y-TZP)(0.5 wt % h-BN) ceramic: K1C = 12 ± 0.53 MPa m1/2. The increase in failure viscosity caused by incorporation of low-modulus inclusions (i.e., h-BN) is due to two dissipative mechanisms: the martensite transformation of the ZrO2 matrix and crack arrest at relatively weak interfaces between the matrix and low-modulus inclusions of h-BN. As the proportion of h-BN increases, the contribution of martensite transformation to the fracture toughness diminishes, a consequence of the grain size of tetragonal zirconia diminishing, which makes this phase stable.

Original languageEnglish
Pages (from-to)1159-1163
Number of pages5
JournalInorganic Materials: Applied Research
Volume10
Issue number5
DOIs
Publication statusPublished - 1 Sep 2019

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Keywords

  • boron nitride
  • ceramic
  • composite
  • dissipative structure
  • fracture toughness
  • multilevel hardening
  • zirconia

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)

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