Spark plasma sintering and mechanical properties of ZrO_2(Y_2O_3) -Al_2O_3 composites

摘要

Spark plasma sintering (SPS) was conducted on nanocrsytalline ZrO_2(Y_2O_3)-20 mol/100 Al_2O_3 powder at a heat rate of 600degC/min with a short holding time. Full density was obtained at sintering temperatures > 1300degC. Considerable grain growth occurred relative to the initial powder particles, but smaller grain size and higher density can be obtained as compared to hot-pressing. High flexural strength and fracture toughness were also achieved for the SPS-resulted composite.