The Effects of Spark-Plasma Sintering (SPS) on the Microstructure and Mechanical Properties of BaTiO 3 /3Y-TZP Composites

摘要

Composite ceramics BaTiO 3 /3Y-TZP containing 0 mol %, 3 mol %, 5 mol %, 7 mol %, and 10 mol % BaTiO 3 have been prepared by conventional sintering and spark-plasma sintering (SPS), respectively. Analysis of the XRD patterns and Raman spectra reveal that the phase composition of t -ZrO 2 , m -ZrO 2 , and BaTiO 3 has been obtained. Our results indicate that SPS can be effective for the decrease in grain size and porosity compared with conventional sintering, which results in a lower concentration of m -ZrO 2 and residual stress. Therefore, the fracture toughness is enhanced by the BaTiO 3 phase through the SPS technique, while the behavior was impaired by the piezoelectric second phase through conventional sintering.