黑色氧化铝陶瓷制备与介电性能的研究

采用正交试验法对黑色氧化铝陶瓷实验配方进行优化;采用一次、二次合成法分别制备了黑色氧化铝陶瓷;对黑色氧化铝陶瓷进行了XRD物相分析、烧结体断面SEM分析,测试了烧结体的体积密度、体积电阻率、介电常数和介电损耗。结果表明,黑色氧化铝陶瓷最佳配方为:Al2O391wt.%、滑石2.0wt.%、Fe2O33wt.%、CoO 0.5wt.%、NiO 1wt.%、MnO22.5wt.%;一次、二次合成法制备的黑色氧化铝陶瓷的体积密度分别为3.71g/cm3、3.69g/cm3,体积电阻率分别为6.8×1012Ω·cm、7.1×1012Ω·cm,介电常数分别为18.6、18.8,介电损耗分别为0.015、0.014。

STUDY ON PREPARATION AND DIELECTRIC PROPERTIES OF BLACK ALUMINA CERAMICS

Experimental idea was optimized through orthogonal test method.Black alumina ceramics were prepared by synthesizing once or twice.Besides,black alumina ceramics were analyzed and their cross-sections also were analyzed.The volume density,volume resistivity,dielectric constant and dielectric loss were measured.The results showed that the best composition of black alumina is： Al2O3 91wt%,3MgO.4SiO2.H2O 2.0wt%,Fe2O3 3wt%,CoO 0.5wt%,NiO 1wt%,MnO2 2.5wt%.The volume densities of once and twice synthesized black alumina samples are 3.71g/cm^3 and 3.69 g/cm^3 respectively;their volume resistivities are 6.8×1012Ω·cm and 7.1×1012Ω·cm;their dielectric constants are 18.6 and 18.8 and their dielectric losses are 0.015 and 0.014.