Silicon-oxide-based microwave dielectric ceramic with low dielectric constant and preparation method of microwave dielectric ceramic

Abstract

The invention discloses a silicon-oxide-based microwave dielectric ceramic with a low dielectric constant and a preparation method of the microwave dielectric ceramic. The expression of the chemical composition of the microwave dielectric ceramic is xZnO-yAl2O3-mSiO2-nSrTiO3, wherein x is greater than or equal to 38 mol% and less than or equal to 64 mol%, y is greater than or equal to 6 mol% and less than or equal to 9 mol%, m is greater than or equal to 26 mol% and less than or equal to 50 mol%, n is greater than or equal to 0 mol% and less than or equal to 7 mol%, and the sum of x, y, m andn is 1. The preparation method of the microwave dielectric ceramic comprises the following steps of (1) preparation of ceramic intermediate powder; (2) preparation of an xZnO-yAl2O3-mSiO2-nSrTiO3 ceramic. The dielectric constant of the microwave dielectric ceramic is 6.4-8.2, the quality factor is 9,346 GHz, and the resonant frequency temperature coefficient is smaller. The microwave dielectric ceramic has great application value in industrial production activities related to the microwave communication field.

Description

technical field [0001] The invention relates to a microwave dielectric ceramic material, in particular to a low dielectric constant microwave dielectric ceramic and a preparation method thereof. Background technique [0002] In recent years, the fifth-generation mobile communication technology (5G), autonomous driving technology, etc. require equipment to work in higher frequency bands to provide wider bandwidth, so there is a large demand for high-performance materials at high frequencies. Microwave dielectric ceramics refer to microwave dielectric ceramics in the microwave frequency band (frequency range 300MHz ~ 300GHz, wavelength 10 -3 m ~ 1m) as ceramics for dielectric substrates, filling materials, etc. in circuits. It can be used in communication equipment such as mobile phones, TV satellites, radio frequency electronic tags (RFID) and military radar. In microwave equipment, reducing the dielectric constant of the substrate can increase the signal transmission rate,...

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Problems solved by technology

[0005] SiO 2 It is the ceramic material with the lowest dielectric constant (ε r ≈3.8), but SiO 2 There are a variety of high and low temperature crystal forms, and the transition from high temperature crystal form to low temperature crystal form will be accompanied by a large volume change, making it difficult to prepare crack-free dense ceramics. 2 Direct addition of sintering aids will cause a substantial increase in the dielectric constant

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