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Temperature-stabilized type ultralow-dielectric-constant microwave dielectric ceramic Li2Mg5O6 and preparation method thereof
The invention discloses a temperature-stabilized type ultralow-dielectric-constant microwave dielectric ceramic Li2Mg5O6 capable of being sintered at a low temperature and a preparation method thereof. The preparation method comprises the following steps: (1) weighing and mixing Li2CO3 and MgO original powder with the purity of more than 99.9% (weight percentage) according to the composition of Li2Mg5O6; (2) performing wet ball milling mixing on the raw materials of the step (1) for 12 hours by using a ball milling medium of anhydrous ethanol, drying, and then pre-burning in an air atmosphere of 800 DEG C for 6 hours; (3) adding a bonding agent into the powder prepared in the step (2), pelleting, then pressing for molding, and finally sintering in an air atmosphere of 850-900 DEG C for 4 hours, wherein the bonding agent is a polyvinyl alcohol solution with the mass concentration of 5%, and the added amount of polyvinyl alcohol accounts for 3% of the total mass of the powder. The ceramic prepared by the method disclosed by the invention is good in sintering, the dielectric constant of the ceramic reaches 7.5-7.9, the quality factor (Qf) value of the ceramic reaches 131000-167000GHz, and the temperature coefficient of resonance frequency is small, so that the ceramic has a great application value in industry.
Temperature-stabilized type ultralow-dielectric-constant microwave dielectric ceramic Li2Mg5O6 and preparation method thereof
The invention discloses a temperature-stabilized type ultralow-dielectric-constant microwave dielectric ceramic Li2Mg5O6 capable of being sintered at a low temperature and a preparation method thereof. The preparation method comprises the following steps: (1) weighing and mixing Li2CO3 and MgO original powder with the purity of more than 99.9% (weight percentage) according to the composition of Li2Mg5O6; (2) performing wet ball milling mixing on the raw materials of the step (1) for 12 hours by using a ball milling medium of anhydrous ethanol, drying, and then pre-burning in an air atmosphere of 800 DEG C for 6 hours; (3) adding a bonding agent into the powder prepared in the step (2), pelleting, then pressing for molding, and finally sintering in an air atmosphere of 850-900 DEG C for 4 hours, wherein the bonding agent is a polyvinyl alcohol solution with the mass concentration of 5%, and the added amount of polyvinyl alcohol accounts for 3% of the total mass of the powder. The ceramic prepared by the method disclosed by the invention is good in sintering, the dielectric constant of the ceramic reaches 7.5-7.9, the quality factor (Qf) value of the ceramic reaches 131000-167000GHz, and the temperature coefficient of resonance frequency is small, so that the ceramic has a great application value in industry.
Temperature-stabilized type ultralow-dielectric-constant microwave dielectric ceramic Li2Mg5O6 and preparation method thereof
XIANG HUAICHENG (Autor:in) / LI CHUNCHUN (Autor:in) / GUO HUANHUAN (Autor:in)
06.05.2015
Patent
Elektronische Ressource
Englisch
IPC:
C04B
Kalk
,
LIME
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