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Low-temperature sintered temperature-stable microwave dielectric ceramic Li3Mg2BO5 and preparation method thereof
The invention discloses a low-temperature sintered temperature-stable microwave dielectric ceramic Li3Mg2BO5 with an ultra-low dielectric constant and a preparation method thereof. The preparation method comprises the following steps of (1) weighing and proportioning starting powder of Li2CO3 of which the purity is 99.9wt%, MgO and H3BO3 according to the composition of Li3Mg2BO5; (2) carrying out wet ball milling on raw materials in the step (1) for 12 hours with anhydrous ethanol serving as a ball milling medium, carrying out oven drying and pre-sintering for 6 hours at an air atmosphere of 800 DEG C to obtain powder; and (3) adding a binder into the powder obtained in the step (2), granulating, carrying out press molding and finally sintering for 4 hours at an air atmosphere of 850-900 DEG C, wherein the binder is 5wt% polyvinyl alcohol solution and the addition of polyvinyl alcohol accounts for 3% of the total mass of the powder. Ceramic prepared by the preparation method, which is disclosed by the invention, is properly sintered, has a dielectric constant of 7.7-8.1, quality factor Qf which reaches 107000-148000GHz and small resonant frequency temperature coefficient and has great application values in the industry.
Low-temperature sintered temperature-stable microwave dielectric ceramic Li3Mg2BO5 and preparation method thereof
The invention discloses a low-temperature sintered temperature-stable microwave dielectric ceramic Li3Mg2BO5 with an ultra-low dielectric constant and a preparation method thereof. The preparation method comprises the following steps of (1) weighing and proportioning starting powder of Li2CO3 of which the purity is 99.9wt%, MgO and H3BO3 according to the composition of Li3Mg2BO5; (2) carrying out wet ball milling on raw materials in the step (1) for 12 hours with anhydrous ethanol serving as a ball milling medium, carrying out oven drying and pre-sintering for 6 hours at an air atmosphere of 800 DEG C to obtain powder; and (3) adding a binder into the powder obtained in the step (2), granulating, carrying out press molding and finally sintering for 4 hours at an air atmosphere of 850-900 DEG C, wherein the binder is 5wt% polyvinyl alcohol solution and the addition of polyvinyl alcohol accounts for 3% of the total mass of the powder. Ceramic prepared by the preparation method, which is disclosed by the invention, is properly sintered, has a dielectric constant of 7.7-8.1, quality factor Qf which reaches 107000-148000GHz and small resonant frequency temperature coefficient and has great application values in the industry.
Low-temperature sintered temperature-stable microwave dielectric ceramic Li3Mg2BO5 and preparation method thereof
DUAN LIAN (author) / LI CHUNCHUN (author) / SU HEPING (author)
2015-04-08
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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