Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China
Material Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China
Department of Metallurgy, The University of Tokyo, Tokyo 113, Japan
中文摘要
Three kinds of high-purity Al2O3 powders, whose average particle size is 0.1, 0.3 and 3.0 mμ respectively, were used as the starting power, and their compacts were fired in the radio-frequency plasma generated at a pressure of 80 Pa using N, as the working gas.Experimental results show that the 0. 1 and 0.3 mp powder compacts can be sintered to nearly the theoretical density within 60 s and this sintering is almost finished in the heating period. It is concluded that the mechanism of liquid sintering, the electric charge effect of Al2O3 powder, and the effect of tempetrature gradient in the compacts can affect simultaneously on the rapid densification of the compacts in the plasma sintering.
Three kinds of high-purity Al2O3 powders, whose average particle size is 0.1, 0.3 and 3.0 mμ respectively, were used as the starting power, and their compacts were fired in the radio-frequency plasma generated at a pressure of 80 Pa using N, as the working gas.Experimental results show that the 0. 1 and 0.3 mp powder compacts can be sintered to nearly the theoretical density within 60 s and this sintering is almost finished in the heating period. It is concluded that the mechanism of liquid sintering, the electric charge effect of Al2O3 powder, and the effect of tempetrature gradient in the compacts can affect simultaneously on the rapid densification of the compacts in the plasma sintering.
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