Abstract
This chapter discusses a study for the comparative investigations of the deformation and fracture of ceramics at various combinations of temperature and deformation rates based on one experimental approach. In this study, silicon nitride, alumina, and zirconia ceramics as well as zirconia single crystals were investigated. Silicon nitride-based ceramics (S-l) were hot-pressed, similar ceramics (S-2) were reaction-bonded and then sintered in an inert medium. Alumina ceramics (A-l) were dry pressed and sintered in air. Zirconia-based ceramics (PSZ-3) containing 3 mol% Y 2 O 3 were hot-pressed. The raw materials of the same composition were used to grow crystals by skull melting methods. In this case, partially stabilized crystals (PSZC-3) contained 3 mol% Y 2 O 3 ; fully stabilized crystals were doped with 10 mol% Y 2 O 3 (FSZC-10) and 20 mol% Y 2 O 3 (FSZC-20). Ceramics and single crystals were investigated mainly at 1200–1400°C, because the majority of power units operate just in this temperature range. The results obtained in this study point to a considerable difference in the mechanical behavior of ceramics and zirconia single crystals.
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