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High-quality-factor low-dielectric-constant microwave dielectric ceramic CaLiLaMo2O9
The invention discloses a temperature-stable low-dielectric-constant microwave dielectric ceramic CaLiLaMo2O9 capable of being sintered at a low temperature and a preparation method of the dielectric ceramic. The preparation method comprises the following steps: (1) weighing powdery raw materials CaCO3, Li2CO3, La2o3 and MoO3 having the purity of 99.9wt% and blending together according to the constitution of CaLiLaMo2O9; (2) mixing the raw materials weighed in the step (1) for 12 hours by virtue of wet ball milling in the presence of distilled water serving as a ball milling medium, drying and then pre-burning in the air atmosphere at 750 DEG C for 6 hours; and (3) adding a binder to the powder obtained in the step (2) and pelletizing, and then pressing for forming, and finally, sintering in the air atmosphere at 800-850 DEG C for 4 hours, wherein the binder is a polyvinyl alcohol solution having the mass concentration of 5%, and the addition of the polyvinyl alcohol accounts for 3% of the total mass of the powder. The prepared ceramic can be well sintered at a temperature below 850 DEG C; the dielectric constant of the ceramic reaches 21.3-22.7, and the quality factor (Qf) value of the ceramic is high up to 91000-135000GHZ; besides, the ceramic is low in resonant frequency temperature coefficient and has an extremely high application value in the industry.
High-quality-factor low-dielectric-constant microwave dielectric ceramic CaLiLaMo2O9
The invention discloses a temperature-stable low-dielectric-constant microwave dielectric ceramic CaLiLaMo2O9 capable of being sintered at a low temperature and a preparation method of the dielectric ceramic. The preparation method comprises the following steps: (1) weighing powdery raw materials CaCO3, Li2CO3, La2o3 and MoO3 having the purity of 99.9wt% and blending together according to the constitution of CaLiLaMo2O9; (2) mixing the raw materials weighed in the step (1) for 12 hours by virtue of wet ball milling in the presence of distilled water serving as a ball milling medium, drying and then pre-burning in the air atmosphere at 750 DEG C for 6 hours; and (3) adding a binder to the powder obtained in the step (2) and pelletizing, and then pressing for forming, and finally, sintering in the air atmosphere at 800-850 DEG C for 4 hours, wherein the binder is a polyvinyl alcohol solution having the mass concentration of 5%, and the addition of the polyvinyl alcohol accounts for 3% of the total mass of the powder. The prepared ceramic can be well sintered at a temperature below 850 DEG C; the dielectric constant of the ceramic reaches 21.3-22.7, and the quality factor (Qf) value of the ceramic is high up to 91000-135000GHZ; besides, the ceramic is low in resonant frequency temperature coefficient and has an extremely high application value in the industry.
High-quality-factor low-dielectric-constant microwave dielectric ceramic CaLiLaMo2O9
WANG DAN (author) / XIANG HUAICHENG (author) / TANG YING (author)
2015-09-30
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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