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Ultralow-dielectric-constant dielectric ceramic InAlMg6O9 and preparation method thereof
The invention discloses temperature-stable type ultralow-dielectric-constant dielectric ceramic InAlMg6O9 and a preparation method thereof. The preparation method comprises: (1) weighing original powders of In2O3, Al2O3 and MgO with the purity of 99.9 wt% or more according to the formula of InAlMg6O9 and proportioning; (2) performing wet-type ball milling mixing on the raw materials of the step (1) for 12 h by selecting distilled water as a ball milling medium, baking and pre-burning at 1300 DEG C in atmosphere for 6 h; and (3) adding a binder into the powder prepared in the step (2) and granulating, then performing compression molding, and finally sintering at 1350-1400 DEG C in atmosphere for 4 h, wherein the binder employs a polyvinyl alcohol solution with the mass concentration of 5% and the addition amount of polyvinyl alcohol is 3% by mass of the total powder. The prepared ceramic has good sintering, has the dielectric constant up to 6.9-7.5, has the quality factor Qf up to 149000-194000 GHz, has a small resonant-frequency temperature coefficient, and has extremely great application value in industry.
Ultralow-dielectric-constant dielectric ceramic InAlMg6O9 and preparation method thereof
The invention discloses temperature-stable type ultralow-dielectric-constant dielectric ceramic InAlMg6O9 and a preparation method thereof. The preparation method comprises: (1) weighing original powders of In2O3, Al2O3 and MgO with the purity of 99.9 wt% or more according to the formula of InAlMg6O9 and proportioning; (2) performing wet-type ball milling mixing on the raw materials of the step (1) for 12 h by selecting distilled water as a ball milling medium, baking and pre-burning at 1300 DEG C in atmosphere for 6 h; and (3) adding a binder into the powder prepared in the step (2) and granulating, then performing compression molding, and finally sintering at 1350-1400 DEG C in atmosphere for 4 h, wherein the binder employs a polyvinyl alcohol solution with the mass concentration of 5% and the addition amount of polyvinyl alcohol is 3% by mass of the total powder. The prepared ceramic has good sintering, has the dielectric constant up to 6.9-7.5, has the quality factor Qf up to 149000-194000 GHz, has a small resonant-frequency temperature coefficient, and has extremely great application value in industry.
Ultralow-dielectric-constant dielectric ceramic InAlMg6O9 and preparation method thereof
JIANG XUEWEN (Autor:in) / LI CHUNCHUN (Autor:in) / SU HEPING (Autor:in)
01.04.2015
Patent
Elektronische Ressource
Englisch
IPC:
C04B
Kalk
,
LIME
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