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Ultralow-dielectric-constant temperature-stable microwave dielectric ceramic Li2CaSiO4
The invention discloses ultralow-dielectric-constant temperature-stable microwave dielectric ceramic Li2CaSiO4 and a preparation method thereof. The preparation method comprises the following steps: (1) weighing and mixing initial powder of Li2CO3, CaO and SiO2 of which the purity is above 99.9% (in percentage by weight) according to the constitution of the Li2CaSiO4; (2) performing wet-type ball milling and mixing on the raw materials obtained in the step (1) for 12 hours by using a ball milling medium of distilled water, drying and pre-roasting at the temperature of 1000 DEG C for 6 hours in air atmosphere; and (3) adding an adhesive into the powder prepared in the step (2), granulating and then performing press-molding, and finally sintering at the temperature of 1050 to 1090 DEG C for 4 hours in the air atmosphere, wherein the adhesive is a polyvinyl alcohol solution of which the mass concentration is 5%; the added amount of polyvinyl alcohol takes up 3% of the total mass of the powder. The ceramic prepared by the method disclosed by the invention is well sintered at the temperature of 1050 to 1090 DEG C, as high as 11.1 to 11.8 in dielectric constant, as high as 145000Hz to 167000Hz in quality factor Qf value, small in temperature coefficient of resonance frequency and extremely large in application value in industry.
Ultralow-dielectric-constant temperature-stable microwave dielectric ceramic Li2CaSiO4
The invention discloses ultralow-dielectric-constant temperature-stable microwave dielectric ceramic Li2CaSiO4 and a preparation method thereof. The preparation method comprises the following steps: (1) weighing and mixing initial powder of Li2CO3, CaO and SiO2 of which the purity is above 99.9% (in percentage by weight) according to the constitution of the Li2CaSiO4; (2) performing wet-type ball milling and mixing on the raw materials obtained in the step (1) for 12 hours by using a ball milling medium of distilled water, drying and pre-roasting at the temperature of 1000 DEG C for 6 hours in air atmosphere; and (3) adding an adhesive into the powder prepared in the step (2), granulating and then performing press-molding, and finally sintering at the temperature of 1050 to 1090 DEG C for 4 hours in the air atmosphere, wherein the adhesive is a polyvinyl alcohol solution of which the mass concentration is 5%; the added amount of polyvinyl alcohol takes up 3% of the total mass of the powder. The ceramic prepared by the method disclosed by the invention is well sintered at the temperature of 1050 to 1090 DEG C, as high as 11.1 to 11.8 in dielectric constant, as high as 145000Hz to 167000Hz in quality factor Qf value, small in temperature coefficient of resonance frequency and extremely large in application value in industry.
Ultralow-dielectric-constant temperature-stable microwave dielectric ceramic Li2CaSiO4
FANG LIANG (author) / WANG DAN (author) / SU HEPING (author)
2015-05-27
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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