A kind of low dielectric constant two-phase composite microwave dielectric ceramic material and its preparation method
A technology of microwave dielectric ceramics and low dielectric constant, applied in ceramics, inorganic insulators, etc., can solve the problem of high temperature coefficient of resonance frequency, achieve good dielectric properties, improve microwave properties, and optimize material properties
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Embodiment 1-14
[0040] Using solid-phase synthesis, weigh MgO and SiO in selected stoichiometric ratios 2 Mix evenly to obtain a mixture, and add water to mix according to the ratio of mixture:water mass ratio of 1:1.2, and add ammonium salt dispersant accounting for 1.0wt% of the total amount of the mixture, and use columnar zirconium balls for ball milling Treatment, the ball milling time is 3-5h, the materials are mixed and dispersed initially, and then placed in a horizontal sand mill, using zirconium balls with a diameter of 1.5mm as the grinding medium for further dispersion, and after grinding, use a microwave dryer to dry until the moisture content is less than 1%, the dried material is sieved by a pulverizer and then calcined in a pusher furnace. The calcining temperature is 1200°C, and the holding time is 3h to obtain the required structure of Mg 2 SiO 4 , put it aside.
[0041] According to the Ca shown in Table 1 below (1-3x / 2-3y / 2) Nd x La y TiO 3 The structure and stoichio...
experiment example
[0051] The above-mentioned granulated materials were respectively molded and sintered, and the sintering temperature of each green body was recorded, and the holding time was 4h. The performance tests were carried out on the porcelain bodies prepared in the above-mentioned Examples 1-14 and Comparative Examples 1-5 respectively. Test performance specifically includes:
[0052] 1) Using the dielectric resonant cavity method proposed by Hakki and Coleman to test the dielectric constant of the material, the f*Q value at 25°C, and the frequency temperature coefficient τf;
[0053] The frequency temperature coefficient τf means that it has good temperature characteristics. It is calculated by testing the resonant frequency f at -40°C, 25°C, and 110°C respectively, and is calculated according to the following formula:
[0054] [(f 110℃ -f -40℃ ) / f 25℃ ] / (150)*10 6 (ppm / °C).
[0055] The measurement and calculation results are shown in Table 2 below.
[0056] Table 2 Performanc...
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