Oxidation of a zirconia-toughened

O. Sahin, Said Nourbakhsh, W. H. Rhee, H. Margolin

Research output: Contribution to journalArticle

Abstract

A Ni3Al composite reinforced with zirconia-toughened alumina fiber, PRD-166 fiber, was produced by pressure casting. The thermochemical stability of the composite at 1100 °C in vacuum and air was investigated by optical and transmission electron microscopy and energy- dispersive spectroscopy (EDS). Vacuum annealing resulted in precipitation of needle-shaped ZrB and cuboid-shaped Cr-rich, tentatively identified as Cr7C3, particles. Annealing in air led to the precipitation of large ZrO2 particles at the fiber/matrix interface and fine ZrO2 platelets in the matrix. A thin layer of A12O3 was observed to cover the fiber/matrix interface and to envelop the ZrO2 platelets. Diffusion of Ni through the A12O3 layer and its oxidation and sub- sequent reaction with A12O3 resulted in the formation of NiAl2O4 spinel around the ZrO2 particles at the fiber/matrix interface. Further annealing resulted in the formation of a thin layer of Cr2O3 on the A12O3 layer and precipitation of A12O3 and Cr2O3 particles within the matrix. These particles subsequently reacted with NiO to form Ni(AlxCr1-x)2O4grains. Diffusion of oxygen through the fiber is believed to be responsible for the rapid oxidation of the composite.

Original languageEnglish (US)
Pages (from-to)3151-3160
Number of pages10
JournalMetallurgical Transactions A
Volume23
Issue number11
DOIs
StatePublished - Nov 1992

Fingerprint

zirconium oxides
Zirconia
fiber-matrix interfaces
Oxidation
oxidation
Fibers
platelets
annealing
composite materials
fibers
Annealing
Platelets
Composite materials
vacuum
Vacuum
air
matrices
Aluminum Oxide
needles
spinel

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Metals and Alloys
  • Mechanics of Materials
  • Engineering(all)

Cite this

Oxidation of a zirconia-toughened. / Sahin, O.; Nourbakhsh, Said; Rhee, W. H.; Margolin, H.

In: Metallurgical Transactions A, Vol. 23, No. 11, 11.1992, p. 3151-3160.

Research output: Contribution to journalArticle

Sahin, O, Nourbakhsh, S, Rhee, WH & Margolin, H 1992, 'Oxidation of a zirconia-toughened', Metallurgical Transactions A, vol. 23, no. 11, pp. 3151-3160. https://doi.org/10.1007/BF02646134
Sahin, O. ; Nourbakhsh, Said ; Rhee, W. H. ; Margolin, H. / Oxidation of a zirconia-toughened. In: Metallurgical Transactions A. 1992 ; Vol. 23, No. 11. pp. 3151-3160.
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