Method for preparing microwave dielectric ceramic material

Abstract

The embodiment of the invention discloses a method for preparing a microwave dielectric ceramic material. The method comprises the following steps of: mechanically mixing calcium carbonate, aluminum oxide, neodymium oxide and titanium dioxide powder, grinding media and organic solvents; performing primary high-energy ball milling on dry powder particles in which the organic solvents are removed, so that the powder is uniformly refined, and the particle size of the powder is controlled in a preset range; calcinating the powder subjected to primary high-energy ball milling in a closed container at high temperature to form precursor powder with a high-purity principal crystalline phase; performing secondary high-energy ball milling on the calcinated powder so as to obtain ceramic powder of which the particle size is further reduced; and adding a solution into the ceramic powder, and making the ceramic powder into a spherical powder particle which has high flowability. By the method, the microwave dielectric ceramic material which is calcinated at low temperature and highly densified and has an intermediate dielectric constant and a high quality factor is prepared.

Description

technical field [0001] The embodiments of the present invention relate to the field of ceramic materials, in particular to a method for preparing microwave dielectric ceramic materials. Background technique [0002] Microwave dielectric ceramics refer to ceramic materials with excellent dielectric properties applied in the microwave frequency range of 300MHz-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] At present, the industry has developed a batch of microwave dielectric ceramic materials with medium dielectric constant and high quality factor suitable for microwave frequency band. Among them, the perovskite structure (1-x)CaTiO 3 -xNdAlO 3 (CTNA, x represents mole percentage) dielectric ceramic material, due to its moderate dielectric co...

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Problems solved by technology

This traditional preparation method mainly has the following defects: the powder reaction activity is poor during the high-temperature calcination process, and a calcination temperature of at least 1350 degrees Celsius is required, and the ceramic powder synthesized by the reaction has a large particle size, a wide particle size distribution, and heterogeneous phases. More and affect the purity of CTNA main crystal phase

Therefore, on the basis of the above-mentioned ceramic powder, the purpose of uniform refinement of powder particles cannot be achieved by further crushing and mixing. Usually, a sintering temperature of at least 1450 degrees Celsius is required, and it is difficult to achieve complete densification of dielectric ceramics, that is, it is difficult to obtain Dielectric ceramic materials with stable and excellent dielectric properties

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