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High-quality factor ultralow-dielectric constant microwave dielectric ceramic CaLiLa3Mo5O21
The invention discloses temperature-stable high-quality factor ultralow-dielectric constant microwave dielectric ceramic CaLiLa3Mo5O21 and a preparation method thereof. The preparation method comprises the following steps: (1) weighing original powder of CaCO3, Li2CO3, La2O3 and MoO3 according to the composition of CaLiLa3Mo5O21 for compounding, wherein the purities are 99.9 percent or higher by weight percent; (2) conducting wet ball mill mixing on the raw materials obtained in the step (1) for 12 hours, carrying out drying, and pre-burning the dried mixture in a 700 DEG C air atmosphere for 6 hours, wherein distilled water is taken as a ball mill medium; (3) adding a binder into the powder obtained in the step (2), carrying out pelleting and pressure molding, and sintering in a 750 to 800 DEG C air atmosphere for 4 hours, wherein the binder adopts a polyvinyl alcohol solution of which the mass concentration is 5 percent, and the add amount of the polyvinyl alcohol solution is 3 percent of the total weight of the powder. The microwave dielectric ceramic prepared according to the preparation method can be well sintered at 800 DEG C or a lower temperature, reaches 14.3 to 15.2 in dielectric constant and 119000 to 147000 GHz in quality factor Qf, is low in temperature coefficient of resonance frequency, and has a very high application value in the industry.
High-quality factor ultralow-dielectric constant microwave dielectric ceramic CaLiLa3Mo5O21
The invention discloses temperature-stable high-quality factor ultralow-dielectric constant microwave dielectric ceramic CaLiLa3Mo5O21 and a preparation method thereof. The preparation method comprises the following steps: (1) weighing original powder of CaCO3, Li2CO3, La2O3 and MoO3 according to the composition of CaLiLa3Mo5O21 for compounding, wherein the purities are 99.9 percent or higher by weight percent; (2) conducting wet ball mill mixing on the raw materials obtained in the step (1) for 12 hours, carrying out drying, and pre-burning the dried mixture in a 700 DEG C air atmosphere for 6 hours, wherein distilled water is taken as a ball mill medium; (3) adding a binder into the powder obtained in the step (2), carrying out pelleting and pressure molding, and sintering in a 750 to 800 DEG C air atmosphere for 4 hours, wherein the binder adopts a polyvinyl alcohol solution of which the mass concentration is 5 percent, and the add amount of the polyvinyl alcohol solution is 3 percent of the total weight of the powder. The microwave dielectric ceramic prepared according to the preparation method can be well sintered at 800 DEG C or a lower temperature, reaches 14.3 to 15.2 in dielectric constant and 119000 to 147000 GHz in quality factor Qf, is low in temperature coefficient of resonance frequency, and has a very high application value in the industry.
High-quality factor ultralow-dielectric constant microwave dielectric ceramic CaLiLa3Mo5O21
TANG YING (author) / LI CHUNCHUN (author) / WANG DAN (author)
2015-09-02
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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