Low-temperature sintering microwave dielectric ceramic Li2Ca2Si2O7 and preparation method thereof
A microwave dielectric ceramic and low-temperature sintering technology, applied in the field of dielectric ceramics, can solve problems such as toxicity and application limitations, and achieve the effect of small temperature coefficient of resonant frequency and large application value
Inactive Publication Date: 2014-01-08
浦北高迈新能源科技有限公司
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[0010] Because compounds containing Bi, Te, Mo, etc. are easy to react with the Ag electrode at the interface and the raw material TeO 2 Toxicity limits the application of these Bi, Te, Mo-based materials
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[0019] Table 1 shows four specific examples of different sintering temperatures constituting the present invention and their microwave dielectric properties. Its preparation method is as described above, carries out the evaluation of microwave dielectric property with cylindrical dielectric resonator method; Li 2 Ca 2 Si 2 o 7 The powder was mixed with Ag powder accounting for 20% of the mass of the powder, pressed and molded, and then sintered at 900 °C for 4 hours; X-ray diffraction phase analysis and scanning electron microscope observation showed that Li 2 Ca 2 Si 2 o 7 There is no chemical reaction with Ag, that is, Li 2 Ca 2 Si 2 o 7 It can be co-fired with Ag electrodes at low temperature.
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Abstract
The invention discloses a low-temperature sintering microwave dielectric ceramic Li2Ca2Si2O7 and a preparation method thereof. The chemical composition formula of the low-temperature sintering microwave dielectric ceramic is Li2Ca2Si2O7. The preparation method comprises the steps of (1) weighing and batching original powder of Li2CO3, CaCO3 and SiO2 with the purity being over 99.9% according to the chemical formula Li2Ca2Si2O7; (2) carrying out mixing and wet ball-milling on raw materials obtained in the step (1) for 12 hours, taking distilled water as a solvent, drying, and then, pre-sintering in an air atmosphere for 6 hours at the temperature of 800 DEG C; (3) adding a binder into powder prepared in the step (2), granulating, then, carrying out compression molding, and finally, sintering in the air atmosphere for 4 hours at the temperature of 870-900 DEG C, wherein a polyvinyl alcohol solution with the mass concentration of 5% is adopted as the binder, and the dosage of the binder accounts for 3% of the total mass of the powder. According to the ceramic prepared by the preparation method, the sintering at the temperature of 870-900 DEG C is good, the dielectric constant reaches 7-8, the quality factor (Qf) reaches up to 94,000-104,000GHz, and the temperature coefficient of resonance frequency is small, so that the ceramic has a great application value in industries.
Description
technical field [0001] The present invention relates to dielectric ceramics, in particular to microwave dielectric ceramics for microwave components used at microwave frequencies, such as dielectric substrates, resonators and filters, and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics refer to ceramics that are used as dielectric materials in circuits in the microwave frequency band (mainly UHF and SHF bands) and perform one or more functions. They are widely used as resonators, filters, and dielectric substrates in modern communications. Components such as chips and dielectric waveguide circuits are the key basic materials of modern communication technology. They have been used in portable mobile phones, car phones, cordless phones, TV satellite receivers and military radars. They are used in modern communication tools. It is playing an increasingly important role in the process of miniaturization and integration. [0003] Dielect...
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IPC IPC(8): C04B35/22C04B35/622
Inventor 苏聪学邓婧方亮
Owner 浦北高迈新能源科技有限公司
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