Preparation method of intermediary composite vanadate system microwave dielectric ceramic: Fid-Bau Portal

Preparation method of intermediary composite vanadate system microwave dielectric ceramic

HUANG YOUHUA / HUANG YOULI / HUANG YOUJIN

The invention discloses a preparation method of an intermediary composite vanadate system microwave dielectric ceramic. The chemical formula of the main component of the microwave dielectric ceramic is LaCu<2-x-y>CaMgVO<6> (x is more than or equal to 0.0 and less than or equal to 0.3, and y is more than or equal to 0.0 and less than or equal to 0.3), an additive is TiO2-C composite powder, the addition amount is 5-10 wt%, and the additive mainly has the following two functions: (1) the temperature coefficient of the vanadate microwave dielectric ceramic is regulated to be close to zero; and the C powder is selected from at least one of Mo2O3, Al2O3, WO3 and ZrO2. The sintering range of the microwave dielectric ceramic is 1200-1300 DEG C, the dielectric constant is 15-20, the quality factor Qf is 40000-50000 GHz, and the temperature coefficient of resonance frequency is -10 ppm/DEG C to 10 ppm/DEG C. The composite vanadate series microwave dielectric ceramic has the excellent dielectric properties of low loss, moderate dielectric constant and near-zero temperature coefficient of frequency, and can meet the requirements of Beidou navigation, satellite communication, Internet of Things and 5G communication.

本发明公开一种中介复合钒酸盐系微波介质陶瓷的制备方法，该微波介质陶瓷的主要成分化学式为：LaCu2～x～yCaxMgyVO6(0.0≤x≤0.3，0.0≤y≤0.3)；添加剂为TiO2～C复合粉体，添加量为5～10wt％，其主要以下两个功能：(1)调控钒酸盐微波介质陶瓷的温度系数近零；C粉体是指Mo2O3、Al2O3、WO3、ZrO2中至少选择一种。本发明微波介质陶瓷的烧结范围为1200～1300℃，介电常数为15～20，品质因数Qf为40000～50000GHz，谐振频率温度系数～10ppm/℃～10ppm/℃，而且复合钒酸盐系列微波介质陶瓷具有低损耗、介电常数适中同时近零频率温度系数的优异介电性能，能满足北斗导航、卫星通讯、物联网和5G通信的需求。

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