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Temperature-stable low-dielectric-constant microwave dielectric ceramic CaLi3Nd3W2O13
The invention discloses a high-quality-factor temperature-stable low-dielectric-constant microwave dielectric ceramic CaLi3Nd3W2O13 and a preparation method thereof. The method comprises the following steps: (1) CaCO3, Li2CO3, Nd2O3 and WO3 original powders with purities higher than 99.9% (weight percentage) are weighed and blended according to the composition of CaLi3Nd3W2O13; (2) the raw material obtained in the step (1) is subjected to wet ball milling for 12h, wherein a ball milling medium is distilled water; after drying, the material is pre-sintered for 6h under a temperature of 720 DEG C in an air atmosphere; and (3) a binding agent is added to the powder obtained in the step (2), granulation and compression molding are carried out; and sintering is carried out for 4h under a temperature of 770-820 DEG C in an air atmosphere. The binding agent is a polyvinyl alcohol solution with a mass concentration of 5%, wherein the addition amount of polyvinyl alcohol accounts for 3% of the total mass of the powder. The ceramic provided by the invention can be well sintered under a temperature below 820 DEG C. The dielectric constant of the ceramic reaches 23.1-23.8, and the quality factor Qf of the ceramic reaches 123000-161000GHz. The ceramic has a low resonance frequency temperature coefficient, and has high application value in industrial application.
Temperature-stable low-dielectric-constant microwave dielectric ceramic CaLi3Nd3W2O13
The invention discloses a high-quality-factor temperature-stable low-dielectric-constant microwave dielectric ceramic CaLi3Nd3W2O13 and a preparation method thereof. The method comprises the following steps: (1) CaCO3, Li2CO3, Nd2O3 and WO3 original powders with purities higher than 99.9% (weight percentage) are weighed and blended according to the composition of CaLi3Nd3W2O13; (2) the raw material obtained in the step (1) is subjected to wet ball milling for 12h, wherein a ball milling medium is distilled water; after drying, the material is pre-sintered for 6h under a temperature of 720 DEG C in an air atmosphere; and (3) a binding agent is added to the powder obtained in the step (2), granulation and compression molding are carried out; and sintering is carried out for 4h under a temperature of 770-820 DEG C in an air atmosphere. The binding agent is a polyvinyl alcohol solution with a mass concentration of 5%, wherein the addition amount of polyvinyl alcohol accounts for 3% of the total mass of the powder. The ceramic provided by the invention can be well sintered under a temperature below 820 DEG C. The dielectric constant of the ceramic reaches 23.1-23.8, and the quality factor Qf of the ceramic reaches 123000-161000GHz. The ceramic has a low resonance frequency temperature coefficient, and has high application value in industrial application.
Temperature-stable low-dielectric-constant microwave dielectric ceramic CaLi3Nd3W2O13
LI CHUNCHUN (Autor:in) / TANG YING (Autor:in) / WANG DAN (Autor:in)
16.09.2015
Patent
Elektronische Ressource
Englisch
IPC:
C04B
Kalk
,
LIME
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