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Temperature-stable low-loss microwave dielectric ceramic Li6Ba4Ti18.5O44 and preparation method thereof
The invention discloses application and a preparation method of lithium-containing composite oxides Li6Ba4Ti18.5O44 as a low-temperature-sintering temperature-stable low-dielectric-constant microwave dielectric ceramic. The preparation method comprises the following steps: (1) weighing and proportioning Li2CO3, BaCO3 and TiO2 original powders with the purity of higher than 99.9 wt% according to the composition of the Li6Ba4Ti18.5O44; (2) carrying out wet ball milling mixing on the raw materials in the step (1) for 12 hours by using anhydrous ethanol as a ball milling medium, drying, and presintering in a 900-DEG C atmospheric atmosphere for 6 hours; and (3) adding an adhesive into the powder prepared in the step (2), granulating, compacting, and finally, sintering in a 950-990-DEG C atmospheric atmosphere for 4 hours, wherein the adhesive adopts a 5 wt% polyvinyl alcohol solution, and the addition amount of the polyvinyl alcohol is 3% of the total mass of the powder. The ceramic has favorable sintering property, the dielectric constant reaches 27.0-27.8, the quality factor Qf value is up to 56000-81000 GHz, the temperature coefficient of resonance frequency is small, and the ceramic has great application value in industry.
Temperature-stable low-loss microwave dielectric ceramic Li6Ba4Ti18.5O44 and preparation method thereof
The invention discloses application and a preparation method of lithium-containing composite oxides Li6Ba4Ti18.5O44 as a low-temperature-sintering temperature-stable low-dielectric-constant microwave dielectric ceramic. The preparation method comprises the following steps: (1) weighing and proportioning Li2CO3, BaCO3 and TiO2 original powders with the purity of higher than 99.9 wt% according to the composition of the Li6Ba4Ti18.5O44; (2) carrying out wet ball milling mixing on the raw materials in the step (1) for 12 hours by using anhydrous ethanol as a ball milling medium, drying, and presintering in a 900-DEG C atmospheric atmosphere for 6 hours; and (3) adding an adhesive into the powder prepared in the step (2), granulating, compacting, and finally, sintering in a 950-990-DEG C atmospheric atmosphere for 4 hours, wherein the adhesive adopts a 5 wt% polyvinyl alcohol solution, and the addition amount of the polyvinyl alcohol is 3% of the total mass of the powder. The ceramic has favorable sintering property, the dielectric constant reaches 27.0-27.8, the quality factor Qf value is up to 56000-81000 GHz, the temperature coefficient of resonance frequency is small, and the ceramic has great application value in industry.
Temperature-stable low-loss microwave dielectric ceramic Li6Ba4Ti18.5O44 and preparation method thereof
FANG LIANG (author) / LUO HAO (author) / SU HEPING (author)
2015-05-27
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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