摘要
采用常压烧结,在1 480、1 500、1 530、1 550℃下制备了Cr2O3-Y2O3-MgO共掺的99氧化铝陶瓷,研究了不同含量的Cr2O3掺杂对99氧化铝陶瓷的致密化、微观结构、微波介电性能和绝缘性能的影响.结果发现:适量的Cr2O3、Y2O3和MgO会促进烧结,减少晶粒间的空隙,提升致密度,进而提升各项性能.当w(Cr2O3)=0.4%、w(Y2O3)=0.24%、w(MgO)=0.16%,烧结温度为1 530℃时,密度为3.919 cm3、介电常数εr为9.985、介电损耗tanδ值为0.000 5、击穿电压为25.3 kV.Cr2O3掺杂使得99氧化铝陶瓷微波介电和绝缘性能提升,在电子封装材料中有良好的应用前景.
Abstract
99%alumina ceramics doped with Cr2O3-Y2O3-MgO were prepared by pressureless sintering at temperatures of 1 480 ℃,1 500 ℃,1 530 ℃,and 1 550 ℃.The effects of varying doping amounts of Cr2O3 on the densification,microstructure,microwave dielectric properties,and insulation properties of the 99%alumina ceramics were studied.The results show that appropriate amounts of Cr2O3,Y2O3,and MgO can promote sintering,reduce intergranular voids,improve density,and enhance overall performance.Under the conditions of w(Cr2O3)=0.4%,w(Y2O3)=0.24%,w(MgO)=0.16%,and sintering temperature of 1 530℃,the ceramics exhibit a density of 3.919 cm3,a dielectric constant(εr)of 9.985,a dielectric loss(tanδ)of 0.000 5,and a breakdown voltage of 25.3 kV.The doping of Cr2O3 improves the microwave dielectric and insulation properties of the 99%alumina ceramics,showing promising potential in electronic packaging materials.
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