Cordierite microwave dielectric ceramic material and preparation method thereof

Abstract

The invention discloses a cordierite microwave dielectric ceramic material and a preparation method thereof, and belongs to the technical field of electronic ceramic materials. The ceramic material comprises the components in percentage by mass: 13 to 18 wt% of MgO, 28 to 37 wt% of Al2O3, 45 to 55 wt% of SiO2, 0 to 10 wt% of TiO2 and 0 to 5 wt% of ZrO2. The method is simple in process and low in raw material cost; the obtained microwave dielectric ceramic material has excellent properties of low dielectric constant and high quality factor, the dielectric constant is 4-6, the quality factor Q*fvalue is 60000-90000 GHz, the loss is reduced, and the signal transmission speed is increased; and the frequency temperature coefficient is less than +/-15 ppm/DEG C, so that the temperature stability is improved.

Description

technical field [0001] The invention belongs to the technical field of electronic ceramic materials, and in particular relates to a cordierite microwave dielectric ceramic material and a preparation method thereof. Background technique [0002] In recent years, communication technologies such as 5G communication and wireless local area network have developed rapidly, and new requirements have been put forward for the transmission efficiency and dielectric loss of materials used. Microwave circuits in communication technology usually contain electronic components such as dielectric resonators, resonators, filters, etc. The basic materials of these electronic components are microwave dielectric ceramics. In order to meet the development needs of miniaturization and low power consumption of communication technology, microwave dielectric ceramics must have high quality factor and low dielectric constant. [0003] Microwave ceramic materials with low dielectric constant are wide...

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Problems solved by technology

Journal of Alloys and Compounds 689(2016) 81-86 reported that the use of calcium titanate for doping modification in cordierite ceramic materials has improved the performance to a certain extent. Its dielectric constant is 7.2, Q×f value is 55490GHz, and the resonance The frequency temperature coefficient is -28.3ppm / ℃. Although the Q×f value and the resonant frequency temperature coefficient have improved, the resonant frequency temperature coefficient has not improved much. In actual use, the material is greatly affected by temperature and is very unstable.

The Chinese patent application number 201410519765.6 announced the addition of TiO 2 By adjusting the frequency temperature coefficient of cordierite ceramics, the microwave dielectric properties of ceramics are improved: the dielectric constant is 6.0-8.0, the resonant frequency temperature coefficient is -0.2ppm / ℃, and the Q×f value is 37800GHz, which is difficult to meet the requirements of low loss

The above method can improve the microwave performance of cordierite to a certain extent, but the quality factor is not greatly improved, and the loss of the manufactured device is too high

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