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Temperature-stable type ultralow-dielectric-constant microwave dielectric ceramic La2YV3O12
The invention discloses tetragonal zirconia structural temperature-stable type ultralow-dielectric-constant microwave dielectric ceramic La2YV3O12 capable of being sintered at a low temperature and a preparation method thereof. The preparation method comprises the following steps: (1) measuring and compounding the original powder of La2O3, Y2O3 and V2O5 with the purity of 99.9 percent (weight percentage) or more according to the constitution of the La2YV3O12; (2) ball milling and mixing the raw materials in the step (1) for 12 hours in a wet method, wherein a ball milling medium is distilled water, drying the raw materials, and then pre-burning the raw materials for 6 hours in an atmosphere of 800 DEG C; (3) adding a binder into the powder prepared in the step (2), granulating, then pressing and molding, and finally sintering the powder for 4 hours in an atmosphere of 850 to 900 DEG C; the binder adopts a polyvinyl alcohol solution with the mass concentration of 5 percent, and the addition amount of the polyvinyl alcohol is 3 percent of the total mass of the powder. The prepared ceramic is good in sintering characteristics at the temperature of 900 DEG C or below, a dielectric constant reaches 14.1 to 14.6, a quality factor Qf value reaches up to 127000 to 165000GHz, the resonant frequency and temperature coefficient are small, and the application value in industry is extremely high.
Temperature-stable type ultralow-dielectric-constant microwave dielectric ceramic La2YV3O12
The invention discloses tetragonal zirconia structural temperature-stable type ultralow-dielectric-constant microwave dielectric ceramic La2YV3O12 capable of being sintered at a low temperature and a preparation method thereof. The preparation method comprises the following steps: (1) measuring and compounding the original powder of La2O3, Y2O3 and V2O5 with the purity of 99.9 percent (weight percentage) or more according to the constitution of the La2YV3O12; (2) ball milling and mixing the raw materials in the step (1) for 12 hours in a wet method, wherein a ball milling medium is distilled water, drying the raw materials, and then pre-burning the raw materials for 6 hours in an atmosphere of 800 DEG C; (3) adding a binder into the powder prepared in the step (2), granulating, then pressing and molding, and finally sintering the powder for 4 hours in an atmosphere of 850 to 900 DEG C; the binder adopts a polyvinyl alcohol solution with the mass concentration of 5 percent, and the addition amount of the polyvinyl alcohol is 3 percent of the total mass of the powder. The prepared ceramic is good in sintering characteristics at the temperature of 900 DEG C or below, a dielectric constant reaches 14.1 to 14.6, a quality factor Qf value reaches up to 127000 to 165000GHz, the resonant frequency and temperature coefficient are small, and the application value in industry is extremely high.
Temperature-stable type ultralow-dielectric-constant microwave dielectric ceramic La2YV3O12
LUO HAO (Autor:in) / TANG YING (Autor:in) / LI CHUNCHUN (Autor:in)
30.12.2015
Patent
Elektronische Ressource
Englisch
IPC:
C04B
Kalk
,
LIME
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