Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Influence of the MgO-TiO2 Co-Additive Content on the Phase Formation, Microstructure and Fracture Toughness of MgO-TiO2-Reinforced Dental Porcelain Nanocomposites

  • Waiwong, Ranida (Department of Prosthodontics, Faculty of Dentistry, Chiang Mai University) ;
  • Ananta, Supon (Department of Physics and Materials Science, Faculty of Science, Chiang Mai University) ;
  • Pisitanusorn, Attavit (Department of Prosthodontics, Faculty of Dentistry, Chiang Mai University)
  • Received : 2016.12.19
  • Accepted : 2017.02.27
  • Published : 2017.03.31
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Abstract

The influence of the co-additive concentration (0 - 45 wt% with an interval of 5 wt%) of MgO-$TiO_2$ on the phase formation, microstructure and fracture toughness of MgO-$TiO_2$-reinforced dental porcelain nanocomposites derived from a one-step sintering technique were examined using a combination of X-ray diffraction, scanning electron microscopy and Vickers indentation. It was found that MgO-$TiO_2$-reinforced dental porcelain nanocomposites exhibited significantly higher fracture toughness values than those observed in single-additive (MgO or $TiO_2$)-reinforced dental porcelain composites at any given sintering temperature. The amount of MgO-$TiO_2$ as a co-additive was found to be one of the key factors controlling the phase formation, microstructure and fracture toughness of these nanocomposites. It is likely that 30 wt% of MgO-$TiO_2$ as a co-additive is the optimal amount for $MgTi_2O_5$ and $Mg_2SiO_4$ crystalline phase formation to obtain the maximum relative density (96.80%) and fracture toughness ($2.60{\pm}0.07MPa{\cdot}m^{1/2}$) at a sintering temperature of $1000^{\circ}C$.

Keywords

References

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