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Ultra-low-loss temperature-stable low dielectric constant microwave dielectric ceramic LiMgNb5O14
The invention discloses ultra-low-loss temperature-stable low dielectric constant microwave dielectric ceramic LiMgNb5O14 and a preparation method thereof. The method comprises the following steps: (1) weighing and proportioning original powder of Li2CO3, MgO and Nb2O5 with the purity of 99.9wt% or above according to the components of the LiMgNb5O14; (2) carrying out wet ball-milling mixing on the raw material obtained in the step (1) for 12 hours, wherein the ball-milling medium is absolute ethyl alcohol; drying and then pre-sintering in a 1050 DEG C air atmosphere for 6 hours; and (3) adding a binder to the powder obtained in the step (2), pelleting, carrying out press molding, and finally sintering in the1100-1150 DEG C air atmosphere for 4 hours, wherein a polyvinyl alcohol with the mass concentration of 5% is adopted as the binder, and the adding amount of polyvinyl alcohol accounts for 3% of the total mass of the powder. The ceramic prepared by the method is good in sintering property; the dielectric constant reaches 22.1-22.9; the quality factor Qf value can be up to 117,000-152,000GHz; the temperature coefficient of the resonance frequency is small; and the microwave dielectric ceramic has great industrial application value.
Ultra-low-loss temperature-stable low dielectric constant microwave dielectric ceramic LiMgNb5O14
The invention discloses ultra-low-loss temperature-stable low dielectric constant microwave dielectric ceramic LiMgNb5O14 and a preparation method thereof. The method comprises the following steps: (1) weighing and proportioning original powder of Li2CO3, MgO and Nb2O5 with the purity of 99.9wt% or above according to the components of the LiMgNb5O14; (2) carrying out wet ball-milling mixing on the raw material obtained in the step (1) for 12 hours, wherein the ball-milling medium is absolute ethyl alcohol; drying and then pre-sintering in a 1050 DEG C air atmosphere for 6 hours; and (3) adding a binder to the powder obtained in the step (2), pelleting, carrying out press molding, and finally sintering in the1100-1150 DEG C air atmosphere for 4 hours, wherein a polyvinyl alcohol with the mass concentration of 5% is adopted as the binder, and the adding amount of polyvinyl alcohol accounts for 3% of the total mass of the powder. The ceramic prepared by the method is good in sintering property; the dielectric constant reaches 22.1-22.9; the quality factor Qf value can be up to 117,000-152,000GHz; the temperature coefficient of the resonance frequency is small; and the microwave dielectric ceramic has great industrial application value.
Ultra-low-loss temperature-stable low dielectric constant microwave dielectric ceramic LiMgNb5O14
FANG LIANG (author) / SUN YIHUA (author) / LI DONGSHENG (author) / SUN XIAOHUA (author)
2015-06-24
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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