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Temperature-stabilized microwave dielectric ceramic Li2AlB3O7 and preparation method thereof
The invention discloses temperature-stabilized microwave dielectric ceramic Li2AlB3O7 and a preparation method thereof. The preparation method comprises the following steps: (1) weighing and batching raw powder of Li2CO3, Al2O3 and H3BO3 of which the purity is above 99.9% (percentage by weight) according to constitution of the Li2AlB3O7; (2) performing wet-type ball-milling mixing on the raw materials obtained in the step (1) for 12 hours by using a ball-milling medium of absolute ethanol, drying and pre-baking for 6 hours in an air atmosphere at the temperature of 720 DEG C; and (3) adding an adhesive into the powder prepared in the step (2), granulating, performing compression moulding and finally sintering for 4 hours in the air atmosphere at the temperature of 780 to 820 DEG C, wherein the adhesive is a polyvinyl alcohol liquid of which the concentration by mass is 5%, and the amount of added polyvinyl alcohol is 3% of the total mass of the powder. The ceramic prepared by the method disclosed by the invention is well sintered, as high as 5.7 to 6.1 in dielectric constant, as high as 105000GHz to 144000GHz in quality factor Qf value, small in temperature coefficient of resonance frequency and extremely large in industrial application value.
Temperature-stabilized microwave dielectric ceramic Li2AlB3O7 and preparation method thereof
The invention discloses temperature-stabilized microwave dielectric ceramic Li2AlB3O7 and a preparation method thereof. The preparation method comprises the following steps: (1) weighing and batching raw powder of Li2CO3, Al2O3 and H3BO3 of which the purity is above 99.9% (percentage by weight) according to constitution of the Li2AlB3O7; (2) performing wet-type ball-milling mixing on the raw materials obtained in the step (1) for 12 hours by using a ball-milling medium of absolute ethanol, drying and pre-baking for 6 hours in an air atmosphere at the temperature of 720 DEG C; and (3) adding an adhesive into the powder prepared in the step (2), granulating, performing compression moulding and finally sintering for 4 hours in the air atmosphere at the temperature of 780 to 820 DEG C, wherein the adhesive is a polyvinyl alcohol liquid of which the concentration by mass is 5%, and the amount of added polyvinyl alcohol is 3% of the total mass of the powder. The ceramic prepared by the method disclosed by the invention is well sintered, as high as 5.7 to 6.1 in dielectric constant, as high as 105000GHz to 144000GHz in quality factor Qf value, small in temperature coefficient of resonance frequency and extremely large in industrial application value.
Temperature-stabilized microwave dielectric ceramic Li2AlB3O7 and preparation method thereof
DUAN LIAN (author) / LI CHUNCHUN (author) / SU HEPING (author)
2015-04-01
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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