Preparation method for improving quality factor of lithium molybdate microwave dielectric ceramic

Abstract

The invention discloses a preparation method for improving a quality factor of a lithium molybdate microwave dielectric ceramic. The preparation method comprises the following steps of first weighing raw materials (NH4)6Mo7O24.4H2O and LiOH.H2O according to a molar ratio of 1:14 for feed proportioning, and adding deionized water into an obtained mixture, so as to obtain a clear solution; afterwards, transferring the solution into a mortar, and heating the solution to 60 DEG C at a constant temperature, thereby completely evaporating moister, so as to obtain white powder; subsequently, using anhydrous alcohol as a dispersing agent, and grinding and drying the white powder to obtain a powder lot which is uniform in particles; after that, granulating the powder lot, and then carrying out compression molding on the granulated powder lot to become a green compact; first carrying out heat preservation on the green compact for 1 hour at 120 DEG C, and then sintering the green compact at 530 DEG C to 550 DEG C, so as to prepare the lithium molybdate microwave dielectric ceramic. According to the preparation method, in comparison with a conventional solid phase method, water is used as a reaction environment; the raw materials can react with one another sufficiently; high-purity lithium molybdate powder is obtained; presintering and ball milling processes are excluded; an impure phase is prevented from being introduced due to an insufficient reaction in the presintering process and the ball milling; therefore, the quality factor is improved; the microwave dielectric property of the ceramic is effectively improved; the preparation method has a better application prospect.

Description

technical field [0001] The invention belongs to a ceramic composition characterized by components, in particular to a preparation method of lithium molybdate microwave dielectric ceramic material sintered at ultra-low temperature. Background technique [0002] In recent years, with the rapid development of radar and communication technology, the requirements for miniaturization, light weight, multi-function and low cost of various microwave mobile communication terminal equipment are constantly increasing. The multilayer structure design based on low-temperature co-fired ceramic (LTCC) technology can effectively reduce the volume of devices, and is an important way to realize the miniaturization, integration and modularization of components. The preparation of multilayer microwave components requires co-firing of microwave dielectric ceramics and high-conductivity electrodes. Therefore, low-temperature co-fired microwave components put forward higher requirements for microwa...

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Problems solved by technology

However, the traditional solid-phase method has the following disadvantages: the inhomogeneity of the microscopic distribution of raw materials cannot be eliminated by using the ball milling mixing method, so it is difficult for the raw materials to fully react in the pre-calcination stage, and it is not easy to obtain the target phase with high purity; because the refinement process is mainly Through ball milling, it is easy to introduce some impurities, which will affect the performance of ceramic materials.

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