Effect of Sintering Temperature on Structure and Properties of a High Purity Alumina Ceramic
A high purity alumina ceramic is prepared by tape-casting method using a binary solvent sys-tem of ethanol and isopropanol,with high-purity magnesium oxide as a sintering aid.The purity of the a-lumina ceramic reaches 99.82%.The effects of sintering temperature on density,grain size,mechanical,thermal and electrical properties of the high purity alumina ceramic are investigated.The results indicate that in a certain range,with the increase of sintering temperature,the density,grain size and the thermal conductivity of the high purity alumina ceramic increases gradually,the dielectric constant,dielectric loss,breakdown strength and bulk resistivity show an upward trend.While the flexural strength first increases and then decreases,reaching the maximum value of 488.9 MPa at the sintering temperature of 1650℃.
High purity aluminaTape-castingSintering temperatureMicrostructureProperty
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维普
