Preparation method for improving quality factor of microwave dielectric ceramic

Abstract

The invention discloses a preparation method for improving a quality factor of a microwave dielectric ceramic. The preparation method comprises the following steps: putting a powder material and zirconia balls into a ball mill tank according to a 1:3 mass ratio of the powder material to the balls, and performing ball-milling on the mixture using a revolution way, drying the ball milled mixture, and performing pre-firing on the raw material mixture powder to obtain a sample clinker; grinding the sample clinker, performing ball milling for 2h using a revolution way, and then adding a small amount of dispersant, performing ball milling for 1h using an autorotation way, and drying after the ball milling to obtain a sample powder; and putting the dried sample powder into a ball mill tank containing a deionized water and ethanol mixture, then putting the ball mill tank into an ultrasonic cleaning machine, and performing ultrasonic vibration and thermal insulation at temperatures of 40 DEG Cand 95 DEG C successively, drying to obtain a sample powder, performing granulation, sieving and compression molding on the sample powder, and finally sintering the sample powder into the microwave dielectric ceramic. The microwave dielectric ceramic prepared by the method has a higher quality factor, has a lower sintering temperature, has fine powder particles without agglomeration, has low production costs, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a production process of a dielectric ceramic material, in particular to a preparation method of a dielectric ceramic material used to manufacture microwave components such as ceramic substrates, resonators and filters used in microwave frequencies. Background technique [0002] Microwave dielectric ceramics refer to ceramic materials that are used as dielectric materials in circuits in the microwave frequency band (mainly 300MHz to 300GHz frequency band) and perform one or more functions. They are key materials for manufacturing microwave dielectric filters and resonators. [0003] Microwave dielectric ceramics have developed rapidly in the past 30 years, and their material systems have been extensively explored and studied. Except for commercialized microwave dielectric ceramic materials, the microwave dielectric properties of most microwave dielectric ceramic materials are uneven. In order to obtain microwave dielectric cera...

AI Technical Summary

Problems solved by technology

However, reaction sintering generally requires powders to be finer, have high chemical activity, or require high temperature or high pressure conditions, which requires powders to obtain chemical For powders with high activity, due to the lack of high chemical activity powders or high temperature and high pressure conditions, it is easy to cause the final product to be accompanied by a large amount of impurities, which also leads to cumbersome preparation processes and low productivity of the final product

[0004] Therefore, from the perspective of industrialization, the high-temperature solid-phase synthesis method is the simplest and most effective microwave dielectric ceramic production method at present, but its inherent shortcomings, such as large energy consumption (long calcination and sintering time), powder is not fine enough, after ball milling Particles are easy to agglomerate, etc. should still attract enough attention in this field