Spray granulation method and preparation method of microwave dielectric powder for filter

Abstract

The invention discloses a spray granulation method and a preparation method of microwave dielectric powder for a filter, and belongs to the technical field of ceramic materials. The spray granulationmethod comprises the following steps: fully dispersing and grinding a microwave dielectric material to obtain raw material slurry; adding the raw material slurry into a glue solution, and uniformly mixing, wherein the glue solution comprises PEG glue, PVA glue, a surfactant, a demolding agent and a defoaming agent; and carrying out spray granulation on the uniformly mixed solution by using a spraydryer. According to the invention, the PEG glue is utilized to effectively improve the plasticity of the green body, reduce the pressing pressure of the green body, eliminate the cracking of the green body, and reduce the problems of easy cracking, easy damage, easy breakage of corners, rough surface and the like of the green body in the CNC machining process; and by utilizing the surfactant, theviscosity of the slurry can be effectively improved under the condition of high solid content, the strength of a green body is improved, the problem of mold sticking caused by PEG glue during subsequent dry pressing molding can be effectively solved, and the molding performance of spray granulation powder is improved.

Description

Technical field [0001] The embodiment of the present invention relates to the technical field of ceramic materials, in particular to a spray granulation method and preparation method of microwave dielectric powder for filters. Background technique [0002] Microwave dielectric ceramics refer to ceramics that are used as dielectric materials in microwave frequency circuits and perform one or more functions. Among them, the microwave frequency range can be UHF (Ultra High Frequency), SHF (Super High Frequency) and many more. Microwave dielectric ceramics have excellent properties such as high dielectric constant, low dielectric loss, and low resonant frequency temperature coefficient. They play the functions of dielectric isolation, dielectric waveguide, and dielectric resonance in microwave frequency circuits. They are resonators, filters, and duplexers. It is an important component of devices such as devices, antennas, frequency stabilized oscillators, waveguide transmission lin...

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Problems solved by technology

However, after using PVA glue to granulate, the stress and pressure of the tried green body are large during dry pressing, which leads to the powder particles not being easily broken during compression molding, the surface texture of the green body is more obvious, and it is easy to crack, and the green body is easy to crack during CNC processing. Damaged, rough surface; and the use of PEG glue for granulation will cause the green body to stick to the mold during dry pressing

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