Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Microstructures and Mechanical Properties of Pressureless and Spark Plasma Sintered ZrO2(3 mol%Y2O3) Bodies

  • Shin, Na-Young (School of Advanced Materials Engineering, Kongju National University) ;
  • Han, Jae-Kil (School of Advanced Materials Engineering, Kongju National University) ;
  • Lee, Hae-Hyoung (Department of Dental Biomaterials, School of Dentistry, Dankook University) ;
  • Lee, Byong-Taek (School of Advanced Materials Engineering, Kongju National University)
  • Published : 2005.02.01
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Abstract

The microstructures and mechanical properties of Tetragonal Zirconia Polycrystals (TZP) sintered bodies, which made by pressureless and spark plasma sintering techniques, were investigated using XRD, SEM, and TEM techniques. In the spark plasma sintered samples, the TZP grains were equiaxed type including many sub-grain boundaries regardless of sintering conditions. The biaxial strength of TZP having an average of 80 nm grains in diameter was high in value with 1025 MPa, but fracture toughness showed a low value due to the absence of a fracture toughening mechanism such as transformation toughening. In the Pressureless Sintered (PLSed) samples, the grain size of TZP was strongly dependent on the sintering temperature; i.e., it gradually increased as the sintering temperature increased. The value of fracture toughness increased as the grain size increased by the stress-induced phase transformation and Borne crack deflection.

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