Effects of grain size and humidity on fretting wear in fine-grained alumina, Al{sub 2}O{sub 3}/TiC, and zirconia

Journal Article · Wed May 01 04:00:00 EDT 1996 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1996.tb08565.x· OSTI ID:253550

Krell, A ^[1]; Klaffke, D ^[2]

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1. Fraunhofer Inst. for Ceramic Technologies and Sintered Materials, Dresden (Germany)
2. Federal Inst. for Materials Research and Testing, Berlin (Germany)

Friction and wear of sintered alumina with grain sizes between 0.4 and 3 {micro}m were measured in comparison with Al{sub 2}O{sub 3}/TiC composites and with tetragonal ZrO{sub 2} (3 mol% Y{sub 2}O{sub 3}). The dependence on the grain boundary toughness and residual microstresses is investigated, and a hierarchical order of influencing parameters is observed. In air, reduced alumina grain sizes improve the micromechanical stability of the grain boundaries and the hardness, and reduced wear is governed by microplastic deformation, with few pullout events. Humidity and water slightly reduce the friction of all of the investigated ceramics. In water, this effect reduces the wear of coarser alumina microstructures. The wear of aluminas and of the Al{sub 2}O{sub 3}/TiC composite is similar; it is lower than observed in zirconia, where extended surface cracking occurs at grain sizes as small as 0.3 {micro}m.

• Sponsoring Organization: USDOE
• OSTI ID: 253550
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 5 Vol. 79; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
COMPOSITE MATERIALS
CORRELATIONS
DEFORMATION
FRICTION
GRAIN BOUNDARIES
HARDNESS
MICROSTRUCTURE
POLISHING
RESIDUAL STRESSES
SAMPLE PREPARATION
TITANIUM CARBIDES
WEAR RESISTANCE
YTTRIUM OXIDES
ZIRCONIUM OXIDES