Abstract
Partially stabilized ZrO2 balls with a diameter of 5mm and a relative density of over 99%, containing 3.7mass% Y, 0.11mass% Si, 590ppm of Ti, 580ppm of P, and 150ppm of Ca as impurities were used. When the ZrO2 balls were placed in a BN crucible and heated by microwave irradiation at 2.45 GHz to 1400 °C for 10min, each ball expanded by 25% in volume due to the formation of numerous fine closed pores and connected with strong linkage and strong bonds formed between the balls. The surface of each ZrO2 ball was a dense layer approximately 100μm thick, and closed pores 5–20μm in diameter formed inside the balls. After heating, the open pore porosity was 2% and the closed pore porosity was 22.2% (total: 24.2%). Superplastic behavior of ZrO2 and generated gas species in the system P–O with a high pressure during heating contribute to show the strong bonds and the closed pores, respectively.
Published Version
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