Grain-size dependence of sliding wear in tetragonal zirconia polycrystals

Journal Article · Sun Dec 01 04:00:00 EST 1996 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1996.tb08081.x· OSTI ID:422712

He, Y; Winnubst, L; Burggraaf, A J; Verweij, H ^[1]; With, B de ^[2]

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1. Univ. of Twente, Enschede (Netherlands)
2. Eindhoven Univ. of Technology (Netherlands)

Using a pin-on-plate tribometer with the reciprocating motion of SiC against yttria-doped tetragonal zirconia polycrystal (Y-TZP) plates, the friction and wear of Y-TZP ceramics were investigated as a function of grain size in dry N{sub 2} at room temperature. The results showed that the overall wear resistance increased as the grain size of Y-TZP ceramics decreased. For grain sizes {le}0.7 {micro}m, the wear results revealed a Hall-Petch type of relationship (d{sup {minus}1/2}) between wear resistance and grain size. In this case, the main wear mechanisms were plastic deformation and microcracking. For grain sizes {le}0.9 {micro}m, the wear resistance was proportional to the reciprocal of the grain diameter. In this regime, delamination and accompanying grain pullout were the main mechanisms. In this case, the phase transformation to monoclinic zirconia had a negative effect on the wear resistance of TZP ceramics. The coefficient of friction tended to be higher for the fine-grained TZP-SiC couples than for coarse-grained TZP-SiC couples, whereas, for a specific regime of grain size, the coefficient of friction was almost independent of the grain size.

• Sponsoring Organization: USDOE
• OSTI ID: 422712
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 12 Vol. 79; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRACKS
CRYSTAL-PHASE TRANSFORMATIONS
DEFORMATION
EXPERIMENTAL DATA
GRAIN SIZE
SILICON CARBIDES
SLIDING FRICTION
WEAR RESISTANCE
YTTRIUM OXIDES
ZIRCONIUM OXIDES