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The effect of SiO2 on high-temperature deformation and strength of zirconia-toughened alumina
Authors:A. Krell  T. Reich  A. Beger  G. A. Gogotsi  Y. L. Groushevsky
Affiliation:1. Zentralinstitut für Festk?rperphysik und Werkstofforschung, Helmholtzstr. 20, 0-8027, Dresden, Germany
2. Institute for Problems of Strength, Academy of Sciences of the Ukrainian SSR, 252014, Kiev, SU, USSR
Abstract:At room temperature, SiO2 additions may increase the fracture toughness, K IC, by diminishing the tetragonal phase contents to about 50%, but with ground surfaces the influence on strength is small. A pronounced decrease in strength is observed with rising temperature in the high toughness region from 20°C to M s, the starting temperature for martensitic transformation. Beyond M s at lower toughness, the strength behaviour is very similar to nontransforming alumina ceramics, and an even modest increase of the silicate concentration intensively promotes propagation-controlled failure in the brittle creep region (> 900°C) and inelastic deformation. With less than 1% amorphous grain boundary phases, damage-free superplasticity is restricted to small strains of less than 10%. The significance of high-temperature data for tool applications is considered by cutting tests with high feeding rates.
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