Abstract
Al2O3–ZrO2 composite ceramic nanopowders were synthesized using a polyacrylamide gel method. The mean particle size of the Al2O3–ZrO2 nanopowders was found to decrease with increasing mole ratio of monomer to the precursor salt. The Al2O3–ZrO2 nanopowders with mean particle size of 10 nm can be densified in 1 h at 965 °C, by application of a dc electrical field. Under a constant dc electrical field, the current density through the sample of Al2O3–ZrO2 rose rapidly when the temperature increased to a certain value. In the sintering process, the current density was restricted when a sharp increase occurred. It was found that current density had a great effect on the sintering process in electric field-assisted sintering. Joule heating was proposed to be the main mechanism of the electric field-assisted sintering process.
Graphical Abstract
The Al2O3–ZrO2 composite ceramic nanopowders were synthesized using a polyacrylamide gel method. The Al2O3–ZrO2 nanopowders can be densified in 1 h at low temperature, by the application of a dc electrical field. Under a constant dc electrical field, the current density through the sample of Al2O3–ZrO2 rose rapidly when the temperature increased to a certain value.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China under Grant No. 51102022, the Natural Science Basic Research Plan in Shaanxi Province of China under Grant No. 2015JQ5149, the China Postdoctoral Science Foundation under Grant No. 2015M582584, and the Special Fund for Basic Research support programs of Chang’an University.
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Su, X., Zhou, J., Wang, B. et al. Synthesis and electric field-assisted sintering behavior of Al2O3–ZrO2 composite nanopowders by polyacrylamide gel method. J Sol-Gel Sci Technol 80, 126–132 (2016). https://doi.org/10.1007/s10971-016-4085-1
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DOI: https://doi.org/10.1007/s10971-016-4085-1