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Microwave dielectric ceramic SrLi3AlV8O24 with ultralow dielectric constant and preparation method thereof
The invention discloses a high-quality-factor temperature-stable ultra-low dielectric constant microwave dielectric ceramic SrLi3AlV8O24 capable of being sintered at low temperature and a preparation method thereof. The preparation method comprises the following steps: (1) weighing initial powder of SrCO3, Li2CO3, A12O3 and V2O5 with the purity over 99.9 % (weight percent) according to the composition of SrLi3AlV8O24 and carrying out batching; (2) carrying out wet-type ball-milling on the raw materials in step (1) for 12 hours, wherein the ball-milling medium is distilled water, and performing pre-sintering for 6 hours in the air atmosphere of 700 DEG C after drying; (3) adding a binder into the powder prepared in step (2) to pelletize the powder, carrying out compression moulding, and finally sintering the formed ceramic in the air atmosphere of 750-800 DEG C for 4 hours, wherein the binder adopts a polyvinyl alcohol solution with the mass concentration of 5 %, and the additive amount of polyvinyl alcohol takes up 3 % of total powder mass. The ceramic prepared from the invention is good in sintering under the temperature of 800 DEG C; the dielectric constant reaches 14.1-14.6; the quality factor Qf value of the ceramic reaches up to 93000-133000 GHz; the resonant frequency temperature coefficient is small; the ceramic has huge application value in industry.
Microwave dielectric ceramic SrLi3AlV8O24 with ultralow dielectric constant and preparation method thereof
The invention discloses a high-quality-factor temperature-stable ultra-low dielectric constant microwave dielectric ceramic SrLi3AlV8O24 capable of being sintered at low temperature and a preparation method thereof. The preparation method comprises the following steps: (1) weighing initial powder of SrCO3, Li2CO3, A12O3 and V2O5 with the purity over 99.9 % (weight percent) according to the composition of SrLi3AlV8O24 and carrying out batching; (2) carrying out wet-type ball-milling on the raw materials in step (1) for 12 hours, wherein the ball-milling medium is distilled water, and performing pre-sintering for 6 hours in the air atmosphere of 700 DEG C after drying; (3) adding a binder into the powder prepared in step (2) to pelletize the powder, carrying out compression moulding, and finally sintering the formed ceramic in the air atmosphere of 750-800 DEG C for 4 hours, wherein the binder adopts a polyvinyl alcohol solution with the mass concentration of 5 %, and the additive amount of polyvinyl alcohol takes up 3 % of total powder mass. The ceramic prepared from the invention is good in sintering under the temperature of 800 DEG C; the dielectric constant reaches 14.1-14.6; the quality factor Qf value of the ceramic reaches up to 93000-133000 GHz; the resonant frequency temperature coefficient is small; the ceramic has huge application value in industry.
Microwave dielectric ceramic SrLi3AlV8O24 with ultralow dielectric constant and preparation method thereof
FANG WEISHUANG (author) / WANG DAN (author) / SU HEPING (author)
2015-09-02
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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