Publication detail

Crack propagation in layered Al2O3/ZrO2 composites prepared by electrophoretic deposition

HADRABA, H. KLIMEŠ, J. MACA, K.

Czech title

Šíření trhlin ve vrstevnatém kompozitu Al2O3 / ZrO2 připraveném elektroforetickou depozicí

English title

Crack propagation in layered Al2O3/ZrO2 composites prepared by electrophoretic deposition

Type

journal article in Web of Science

Language

en

Original abstract

Crack propagation through layered Al2O3/ZrO2 composites was studied. The specimens were prepared via electrophoretic deposition of alumina and zirconia powders from suspensions with monochloroacetic acid and isopropanol. The kinetics of electrophoretic deposition could be described fully if the electrophoretic mobility and conductivity of suspensions were known. The conductivity of suspensions increased in the course of deposition. Adjusting to properly controlled kinetics of deposition and sintering, deposits were prepared with strongly bonded layers of different pre-defined thicknesses and, consequently, with different magnitudes of residual stress. Cracks, produced by an indentation technique, propagated askew towards layer interfaces deflected towards the interface in the Al2O3 layers and away from the interface in the ZrO2 layers. Changes in the direction of crack propagation were described for the whole range of angles of incidence (0 – 90deg). The biggest change in the crack propagation was observed for the angle of incidence 45deg and was ca 15deg, irrespective of the magnitude of residual stress in the layers.

Czech abstract

Bylo studováno šíření trhlin přes vrstevnatý kompozit Al2O3 / ZrO2. Vzorky byly připraveny elektroforetickou depozicí submikrometrového Al2O3 a nanometrového ZrO2 prášku ze suspenzí s kyselinou monochloroctovou a isopropanolem. V první části práce bylo zjištěno, že kinetiku elektroforetické depozice lze dobře popsat při znalosti elektroforetické pohyblivosti a vodivosti suspenzí a že vodivost suspenzí se v průběhu depozice zvyšovala. Díky zvládnutí kinetiky depozice a slinování byly připraveny depozity s pevně vázanými vrstvami o různých, předem definovaných tloušťkách a tedy s různými velikostmi residuálních napětí v nich. Trhliny šířící se šikmo k rozhraním vrstev se stáčely směrem k rozhraní v Al2O3 a směrem od rozhraní v ZrO2 vrstvách. Změny ve směru šíření trhlin byly popsány v pro celý rozsah úhlů dopadu (0 – 90deg). Největší oddchylka v šíření trhlin byla pozorována pro úhel dopadu 45deg a byla 15deg, nezávisle na velikosti reziduálních napětí.

English abstract

Crack propagation through layered Al2O3/ZrO2 composites was studied. The specimens were prepared via electrophoretic deposition of alumina and zirconia powders from suspensions with monochloroacetic acid and isopropanol. The kinetics of electrophoretic deposition could be described fully if the electrophoretic mobility and conductivity of suspensions were known. The conductivity of suspensions increased in the course of deposition. Adjusting to properly controlled kinetics of deposition and sintering, deposits were prepared with strongly bonded layers of different pre-defined thicknesses and, consequently, with different magnitudes of residual stress. Cracks, produced by an indentation technique, propagated askew towards layer interfaces deflected towards the interface in the Al2O3 layers and away from the interface in the ZrO2 layers. Changes in the direction of crack propagation were described for the whole range of angles of incidence (0 – 90deg). The biggest change in the crack propagation was observed for the angle of incidence 45deg and was ca 15deg, irrespective of the magnitude of residual stress in the layers.

Keywords in Czech

elektroforetická depozice, Al2O3, ZrO2, vrstevnatý kompozit, odchýlení trhliny

Keywords in English

electrophoretic deposition; alumina; zirconia; layered composite; crack deflection

RIV year

2007

Released

25.04.2007

Publisher

Springer

Location

233 SPRING STREET, NEW YORK, NY 10013 USA

ISSN

0022-2461

Journal

Journal of Materials Science

Volume

42

Number

15

Pages from–to

6404–6411

Pages count

8

BIBTEX


@article{BUT44026,
  author="Hynek {Hadraba} and Jan {Klimeš} and Karel {Maca},
  title="Crack propagation in layered Al2O3/ZrO2 composites prepared by electrophoretic deposition",
  journal="Journal of Materials Science",
  year="2007",
  volume="42",
  number="15",
  month="April",
  pages="6404--6411",
  publisher="Springer",
  address="233 SPRING STREET, NEW YORK, NY 10013 USA",
  issn="0022-2461"
}