Method for preparing microwave dielectric ceramic material

A technology of microwave dielectric ceramics and grinding media, which is applied in the field of ceramic materials, can solve the problems of large particle size of ceramic powder, many impurity phases, and it is not easy for dielectric ceramics to be sintered and completely densified. Guaranteed high densification effect

Inactive Publication Date: 2013-01-16
ANHUI TATFOOK TECH CO LTD
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AI Technical Summary

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
There

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  • Method for preparing microwave dielectric ceramic material
  • Method for preparing microwave dielectric ceramic material
  • Method for preparing microwave dielectric ceramic material

Examples

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Example Embodiment

[0013] Example one

[0014] A high-performance microwave dielectric ceramic material preparation method, the flow chart is as follows figure 1 Shown, including:

[0015] In step S1, the powders of calcium carbonate, alumina, neodymium oxide and titanium dioxide are mechanically mixed with grinding media and organic solvents.

[0016] In the embodiment of the present invention, the raw neodymium oxide powder is first calcined at 800 degrees Celsius for 3 hours, and then calcium carbonate, aluminum oxide, neodymium oxide, and titanium dioxide are weighed according to the required molar percentage formula, and then zirconium dioxide grinding balls are used as Grinding medium, anhydrous ethanol or deionized water as the organic solvent, the mass ratio of the grinding ball, mixed powder, and solvent is 3:1:3, the overall volume of the spherical tank is 40%-60%, and the raw material mixing time is 8~ 12 hours. Wherein, the molar percentage of alumina and neodymium oxide is 0.14% to 0.24%...

Example Embodiment

[0032] Example two

[0033] A preparation method of microwave dielectric ceramic material includes:

[0034] Step one, pre-burn the raw neodymium oxide powder at 800 degrees Celsius for 3 hours before mixing to remove moisture; according to the chemical formula 0.72CaTiO 3 -0.28NdAlO 3 Mechanically mix calcium carbonate, alumina, pre-fired neodymium oxide, and titanium dioxide powder; use zirconium dioxide grinding balls as the grinding medium, absolute ethanol or deionized water as the organic solvent, and the mass ratio of the grinding balls, mixed powder, and solvent is 3:1:3, its overall volume occupies 40%-60% of the spherical tank, and the raw material mixing time is 12 hours.

[0035] In the embodiment of the present invention, the stoichiometric ratios of calcium carbonate and titanium dioxide are both 0.72 mol%, and the stoichiometric ratios of alumina and neodymium oxide are both 0.28 mol%. Among them, the purity of calcium carbonate and alumina powder in the raw materials...

Example Embodiment

[0043] Example three

[0044] A preparation method of microwave dielectric ceramic material includes:

[0045] Step 1. Pre-burn the neodymium oxide powder at 800 degrees Celsius for 3 hours before mixing to remove moisture; according to the chemical formula 0.62CaTiO 3 -0.38NdAlO 3 Mechanically mix calcium carbonate, alumina, pre-fired neodymium oxide, and titanium dioxide powder; use zirconium dioxide grinding balls as the grinding medium, absolute ethanol or deionized water as the organic solvent, and the mass ratio of the grinding balls, mixed powder, and solvent is 3:1:3, its overall volume occupies 40%-60% of the spherical tank, and the raw material mixing time is 10 hours.

[0046] In the embodiment of the present invention, the stoichiometric ratio of calcium carbonate and titanium dioxide is both 0.62 mol%, and the stoichiometric ratio of alumina and neodymium oxide is both 0.38 mol%. Among them, the purity of calcium carbonate and alumina powder in the raw materials is grea...

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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...

Claims

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Application Information

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IPC IPC(8): C04B35/465C04B35/626
Inventor 赵可沦刘绍军万冰冰郭武
Owner ANHUI TATFOOK TECH CO LTD
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