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Temperature-stable low-dielectric-constant microwave dielectric ceramic Li4Mg4CuSb2O12 and preparation method thereof
The invention discloses low temperature sinterable high-quality-factor temperature-stable low-dielectric-constant microwave dielectric ceramic Li4Mg4CuSb2O12 and its preparation method. The preparation method comprises the following steps: (1) weighing original powders of Li2CO3, MgO, CuO and Sb2O5 with the purity being 99.9 wt% and above according to composition of Li4Mg4CuSb2O12; (2) carrying out wet ball-milling on the raw materials from the step (1) and mixing for 12 h, drying and presintering in atmosphere of 700 DEG C for 6 h, wherein a ball-milling medium is distilled water; and (3) adding a binder into the powder prepared in the step (2) and pelleting, carrying out compression moulding, and finally sintering in atmosphere of 750-800 DEG C for 4 h, wherein the binder is a polyvinyl alcohol solution with mass concentration of 5%, and polyvinyl alcohol accounts for 3% of total mass of the powder. The prepared ceramic is sintered well below 800 DEG C; dielectric constant reaches 23.1-23.9; quality factor Qf value reaches up to 97000-129000 GHz; and temperature coefficient of resonance frequency is small. The ceramic provided by the invention has great application value in the industry.
Temperature-stable low-dielectric-constant microwave dielectric ceramic Li4Mg4CuSb2O12 and preparation method thereof
The invention discloses low temperature sinterable high-quality-factor temperature-stable low-dielectric-constant microwave dielectric ceramic Li4Mg4CuSb2O12 and its preparation method. The preparation method comprises the following steps: (1) weighing original powders of Li2CO3, MgO, CuO and Sb2O5 with the purity being 99.9 wt% and above according to composition of Li4Mg4CuSb2O12; (2) carrying out wet ball-milling on the raw materials from the step (1) and mixing for 12 h, drying and presintering in atmosphere of 700 DEG C for 6 h, wherein a ball-milling medium is distilled water; and (3) adding a binder into the powder prepared in the step (2) and pelleting, carrying out compression moulding, and finally sintering in atmosphere of 750-800 DEG C for 4 h, wherein the binder is a polyvinyl alcohol solution with mass concentration of 5%, and polyvinyl alcohol accounts for 3% of total mass of the powder. The prepared ceramic is sintered well below 800 DEG C; dielectric constant reaches 23.1-23.9; quality factor Qf value reaches up to 97000-129000 GHz; and temperature coefficient of resonance frequency is small. The ceramic provided by the invention has great application value in the industry.
Temperature-stable low-dielectric-constant microwave dielectric ceramic Li4Mg4CuSb2O12 and preparation method thereof
FANG WEISHUANG (Autor:in) / WANG DAN (Autor:in) / LI CHUNCHUN (Autor:in)
27.01.2016
Patent
Elektronische Ressource
Englisch
IPC:
C04B
Kalk
,
LIME
| Europäisches Patentamt | 2015
| Europäisches Patentamt | 2015
| Europäisches Patentamt | 2015
| Europäisches Patentamt | 2015
| Europäisches Patentamt | 2016