Low-dielectric magnesium silicate microwave dielectric ceramic material and preparation method thereof

The invention is applicable to the technical field of dielectric ceramics, and discloses a low-dielectric magnesium silicate microwave dielectric ceramic material. The material comprises a main component and a modifying additive, the main component is MgSiO4, and x is equal to 0-0.5; and the modifying additive is a combination of at least two of Al2O3, Bi2O3, CaTiO3, TiO2, ZrO2, SnO2, Sm2O3, B2O3 and LiF. The invention also provides a method for preparing the low-dielectric magnesium silicate microwave dielectric ceramic material. The low-dielectric magnesium silicate microwave dielectric ceramic material has the advantages of high thermal shock resistance, adjustable dielectric constant, high quality factor and near-zero temperature coefficient of resonance frequency. 本发明适用于介质陶瓷技术领域，公开了一种低介硅酸镁微波介质陶瓷材料，包括主体成分和改性添加剂，所述主体成分为Mg2+xSiO4，其中x＝0～0.5；所述改性添加剂为Al2O3、Bi2O3、CaTiO3、TiO2、ZrO2、SnO2、Sm2O3、B2O3、LiF中的至少两个的组合。还提供了一种制备所述低介硅酸镁微波介质陶瓷材料的方法。本发明的低介硅酸镁微波介质陶瓷材料具有高抗热震、介电常数可调、高品质因数和近零的谐振频率温度系数的优点。