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Ultralow dielectric constant microwave dielectric ceramic with near-zero temperature coefficient of resonance frequency and preparation method of microwave dielectric ceramic
The invention discloses a low-temperature sintered ultralow dielectric constant microwave dielectric ceramic Li3Al5O9 with a near-zero temperature coefficient of resonance frequency and a preparation method of the microwave dielectric ceramic. The preparation method comprises the following steps: (1), weighing and dosing original powder of Li2CO3 and Al2O3 with the purity over 99.9% (percentage by weight); (2), wet ball-milling and mixing the raw material in the step (1), wherein the ball-milling medium is anhydrous ethanol, and pre-sintering for 6 hours in an atmosphere at 800 DEG C after drying; (3), adding a binder into the powder prepared in the step (2) and granulating, then pressing and molding, and finally sintering for 4 hours in an atmosphere at 850-900 DEG C, wherein the binder is a polyvinyl alcohol solution with mass concentration of 5% and the addition of polyvinyl alcohol is 3% of the total mass of the powder. The ceramic prepared by the invention is sintered well, the dielectric constant reaches 8.1-8.6, the quality factor value Qf reaches up to 134000-175000GHz, the temperature coefficient of resonance frequency is near-zero, and the microwave dielectric ceramic has an extremely huge application value industrially.
Ultralow dielectric constant microwave dielectric ceramic with near-zero temperature coefficient of resonance frequency and preparation method of microwave dielectric ceramic
The invention discloses a low-temperature sintered ultralow dielectric constant microwave dielectric ceramic Li3Al5O9 with a near-zero temperature coefficient of resonance frequency and a preparation method of the microwave dielectric ceramic. The preparation method comprises the following steps: (1), weighing and dosing original powder of Li2CO3 and Al2O3 with the purity over 99.9% (percentage by weight); (2), wet ball-milling and mixing the raw material in the step (1), wherein the ball-milling medium is anhydrous ethanol, and pre-sintering for 6 hours in an atmosphere at 800 DEG C after drying; (3), adding a binder into the powder prepared in the step (2) and granulating, then pressing and molding, and finally sintering for 4 hours in an atmosphere at 850-900 DEG C, wherein the binder is a polyvinyl alcohol solution with mass concentration of 5% and the addition of polyvinyl alcohol is 3% of the total mass of the powder. The ceramic prepared by the invention is sintered well, the dielectric constant reaches 8.1-8.6, the quality factor value Qf reaches up to 134000-175000GHz, the temperature coefficient of resonance frequency is near-zero, and the microwave dielectric ceramic has an extremely huge application value industrially.
Ultralow dielectric constant microwave dielectric ceramic with near-zero temperature coefficient of resonance frequency and preparation method of microwave dielectric ceramic
CHEN JINWU (Autor:in) / TANG YING (Autor:in) / SU HEPING (Autor:in)
29.04.2015
Patent
Elektronische Ressource
Englisch
IPC:
C04B
Kalk
,
LIME
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