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Ca(Mg1–xCox)Si2O6 陶瓷的烧结性能与微波介电性能

DOI: 10.14062/j.issn.0454-5648.2015.09.07

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Abstract:

通过Co2+对Mg2+的取代,探讨不同x值下Ca(Mg1–xCox)Si2O6陶瓷的物相组成、烧结性能、微观结构以及微波介电性能。结果表明Co2+对Mg2+的取代,可将Ca(Mg1–xCox)Si2O6陶瓷的烧结温度从1300℃降低至1175℃;Co2+在Ca(Mg,Co)Si2O6中的固溶极限在0.2~0.3之间,Mg2+在Ca(Co,Mg)Si2O6中的固溶极限在0.3~0.4之间,当x位于0.3~0.6之间时,出现Ca(Mg,Co)Si2O6与Ca(Co,Mg)Si2O6两相共存;无论是Co2+固溶入CaMgSi2O6,形成Ca(Mg,Co)Si2O6,还是Mg2+固溶进入CaCoSi2O6,形成Ca(Co,Mg)Si2O6,陶瓷晶粒均随固溶度的增大,出现异常长大,进而恶化陶瓷的品质因数。当x=0.5时,Ca(Mg,Co)Si2O6与Ca(Co,Mg)Si2O6两相共存,有效细化了陶瓷晶粒尺寸,1225℃烧结后,陶瓷的微波介电性能为εr=8.04,品质因数Q×f=59108GHz,谐振频率温度系数τf=–51.02×10–6/℃。

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