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- W2000619807 abstract "Minikugeln finden Anwendung in Lagern von Zahnarztbohrern. Diese Lager werden zusammen mit den Bohrspitzen heißdampfsterilisiert und werden daher ungeschmiert betrieben. In der vorliegenden Arbeit wird anhand von Raman Streuexperimenten gezeigt, dass durch Heißdampfsterilisationen in Y2O3 stabilisierten ZrO2-Minikugel eine Phasenumwandlung von tetragonalem nach monoklinem ZrO2 stattfindet. Diese Umwandlung führt letztendlich zu einem Versagen der ZrO2-Minikugel unter den tribologischen Beanspruchungen in einem Zahnarztbohrer. Werden die ZrO2-Minikugel dagegen durch CeO2 stabilisiert, sind solche Phasenumwandlungen durch Heißdampfsterilisationen nicht zu beobachten. Anschließende tribologische Experimente belegen, dass im Sol-Gel Verfahren hergestellte, CeO2 stabilisierte ZrO2-Minikugeln wälzbeständig sind, wenn große Poren bei der Herstellung vermieden werden können. Validation of the Resistance of ZrO2-Mini Balls against Hot Vapour Sterilisation Mini-balls are used in bearings of dental drills. As the bearings as well as the drills are hot vapour sterilised, the bearings are operated under non-lubricated conditions. In the present study, Raman scattering experiments show that hot vapour sterilisations of Y2O3 stabilised ZrO2-Mini-balls lead to a phase transition from tetragonal to monoclinic ZrO2. This phase transition finally causes the failure of ZrO2-Mini-balls under the tribological conditions typical for dental drills. If, however, the ZrO2-Mini-balls are stabilised using CeO2, such hot vapour sterilisation induced phase transitions could not be observed. Subsequent tribological experiments prove that CeO2 stabilised ZrO2-Mini-balls, produced in a Sol-Gel process, are resistant to slip-rolling conditions, if large pores can be avoided." @default.
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- W2000619807 date "2005-09-01" @default.
- W2000619807 modified "2023-09-25" @default.
- W2000619807 title "Validierung der Beständigkeit von ZrO2-Minikugeln gegenüber Heißdampfsterilisation" @default.
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- W2000619807 doi "https://doi.org/10.1002/mawe.200500894" @default.
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