Preparation method of microwave dielectric ceramics materials

Abstract

The invention discloses a preparation method of microwave dielectric ceramics materials. The preparation method of the microwave dielectric ceramics materials comprises that the mixed powder of strontium carbonate, alumina, lanthanum oxide and titanium oxide are mechanically and evenly mixed in a spherical tank to form powder particles; and first time high energy ball milling is carried out on the powder particles to mill the powder particles evenly. The powder after the first time high energy ball milling is high-temperature calcined in a closed container to form precursor powder; and a second time high energy ball milling is carried out on the precursor powder to further mill the precursor powder evenly so as to form ceramic powder. The preparation method of the microwave dielectric ceramics materials sinters microwave dielectric ceramics materials with high densified mediation electric constant and a high quality factor by adopting low temperature, sintering temperature can be greatly lowered, sintering time can be greatly shortened, high densification is achieved, and therefore production cost and technical difficulty are reduced.

Description

technical field [0001] The invention relates to the field of ceramic materials, in particular to a preparation method of a microwave dielectric ceramic material. Background technique [0002] Microwave dielectric ceramics refer to ceramic materials with excellent dielectric properties applied in the microwave frequency range of 300MHz to 300GHz and used in microwave frequency circuits as dielectric materials to complete one or more functions. New functional electronic ceramic materials, in the microwave The circuit plays the functions of dielectric isolation, dielectric waveguide and dielectric resonance. [0003] Due to the perovskite structure (Ca,Sr)TiO 3 -LaAlO 3 (x represents the mole percentage) microwave-based dielectric ceramic material has a relatively high dielectric constant (30<ε r <45), close to zero resonant frequency temperature coefficient (τ f ~0) and quite high quality factor (Q×f>30000), which has aroused extensive attention and research in th...

AI Technical Summary

Problems solved by technology

This traditional preparation method mainly has the following defects: the powder reaction activity is relatively poor in the high-temperature sintering process, and a high sintering temperature (at least 1580 degrees Celsius; 1580-1680 degrees Celsius) is required, resulting in extremely high production energy consumption. The liquid phase sintering method is used to reduce the sintering temperature, but the degree of reduction is limited (1430-1460 degrees Celsius), and the dielectric properties of the finished product will be damaged to varying degrees; the ceramic powder synthesized by the reaction has a large particle size and a wide particle size distribution, which is difficult to achieve. The sintering is highly densified, and its uniformity can only be guaranteed by prolonging the mixing time, that is, it is difficult to obtain a dielectric ceramic material with stable and excellent microwave dielectric properties

[0005] Therefore, it is necessary to provide a method for preparing microwave dielectric ceramic materials to solve the problems of high sintering temperature, long sintering time and difficulty in achieving sintering densification in the process of preparing microwave dielectric ceramic materials in the prior art

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