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Temperature-stable ultralow-dielectric constant microwave dielectric ceramic BiNb3W2O15 and preparation method thereof
The invention discloses an application taking tungstate BiNb3W2O15 as a temperature-stable ultralow-dielectric constant microwave dielectric ceramic, and a preparation method of the microwave dielectric ceramic. The preparation method comprises the following steps: (1) weighing and mixing Bi2O3, Nb2O5 and WO3 initial powder with the purity of not less than 99.9% (weight percentage) according to the composition of BiNb3W2O15; (2) performing wet type ball milling and mixing on raw materials in the step (1) for 12 hours, drying and then preburning for 6 hours at atmosphere of 700DEG C, wherein a ball milling medium is anhydrous ethanol; and (3) adding a binder into the powder obtained in the step (2) and granulating, performing compression forming, and sintering for 4 hours at the atmosphere of 750-790DEG C, wherein the binder adopts a 5wt% polyvinyl alcohol solution, and the addition amount of polyvinyl alcohol accounts for 3% of total mass of powder. The prepared ceramic is good in sintering, the dielectric constant achieves 12.1-12.7, the quality factor Qf value is up to 95000-121000GHz, the resonant frequency temperature coefficient is low, and the temperature-stable ultralow-dielectric constant microwave dielectric ceramic has great application value industrially.
Temperature-stable ultralow-dielectric constant microwave dielectric ceramic BiNb3W2O15 and preparation method thereof
The invention discloses an application taking tungstate BiNb3W2O15 as a temperature-stable ultralow-dielectric constant microwave dielectric ceramic, and a preparation method of the microwave dielectric ceramic. The preparation method comprises the following steps: (1) weighing and mixing Bi2O3, Nb2O5 and WO3 initial powder with the purity of not less than 99.9% (weight percentage) according to the composition of BiNb3W2O15; (2) performing wet type ball milling and mixing on raw materials in the step (1) for 12 hours, drying and then preburning for 6 hours at atmosphere of 700DEG C, wherein a ball milling medium is anhydrous ethanol; and (3) adding a binder into the powder obtained in the step (2) and granulating, performing compression forming, and sintering for 4 hours at the atmosphere of 750-790DEG C, wherein the binder adopts a 5wt% polyvinyl alcohol solution, and the addition amount of polyvinyl alcohol accounts for 3% of total mass of powder. The prepared ceramic is good in sintering, the dielectric constant achieves 12.1-12.7, the quality factor Qf value is up to 95000-121000GHz, the resonant frequency temperature coefficient is low, and the temperature-stable ultralow-dielectric constant microwave dielectric ceramic has great application value industrially.
Temperature-stable ultralow-dielectric constant microwave dielectric ceramic BiNb3W2O15 and preparation method thereof
FANG LIANG (Autor:in) / CHEN JINWU (Autor:in) / SU HEPING (Autor:in)
10.06.2015
Patent
Elektronische Ressource
Englisch
IPC:
C04B
Kalk
,
LIME
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