Surface fatigue in ceria-stabilized polycrystalline tetragonal zirconia between room temperature and 1073 K

• Published in: Journal of materials science Vol. 30; no. 1; pp. 151 - 161
• Main Authors: GUILLOU, M.-O, HENSHALL, J. L, HOOPER, R. M
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 1995
• Subjects: Applied sciences; Building materials. Ceramics. Glasses; Ceramic industries; Chemical industry and chemicals; Exact sciences and technology; Structural ceramics; Technical ceramics; Cerium Oxides; Tetragonal lattices; Polycrystal; Temperature effect; Mechanical properties; Stabilized zirconia; Zirconium Oxides; Experimental study; Indentation; Oxide ceramics; Surface fatigue; Structural ceramic
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/BF00352144

The fatigue deformation and fracture induced by pressing 120 hardened silver steel conical tips against a flat, polished CeTZP counterface between 293 and 1073 K with cyclic loads of 19.6 +/- 9.8 N, for up to 475,000 cycles, are investigated. The ground tips of the cones plastically deformed during the initial loading cycle to produce a flattened end which conformed with the substrate. At temperatures up to, and including, 673 K, the sequence of events is that a tetragonal to monoclinic transformed zone is formed around the contact zone. This expands as the number of cycles is increased. Much later in the fatigue process, grain lifting occurs at the periphery of the contact zone. This subsequently causes intergranular pitting to progress around the edge of the contact zone, followed by extension both away from and into the contact region. (Author)