High frequency medium ceramic with low dielectric constant and high Q value, and preparing method thereof
A low-dielectric constant, high-frequency medium technology, applied in circuits, electrical components, piezoelectric/electrostrictive/magnetostrictive devices, etc., can solve the problems of high cost, complex chemical process, and difficult control of process parameters. , to achieve the effect of simplifying the preparation process and broad application prospects
Inactive Publication Date: 2008-09-17
TIANJIN UNIV
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Problems solved by technology
However, the traditional solid-state reaction method to synthesize Mg 4 Nb 2 o 9 Always accompanied by the formation of other impurity phases, the existence of these impurity phases is very harmful to the acquisition of high Q f values; the chemical process is complicated, the process parameters are not easy to control, and the cost is high, so it is difficult to industrialize
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[0020] The present invention adopts MgO (purity greater than 99.7%) and Nb 2 o 5 (purity not less than 99.99%) as the initial raw material to prepare Mg 4 Nb 2 o 9 High frequency dielectric ceramics.
[0021] MgO, Nb 2 o 5 The ingredients are formulated according to the mass percentage, and the mass ratio of materials: deionized water: zirconium balls is 1: 1: 1.5. Put them into the polyester tank, and ball mill on the planetary ball mill; then put the raw materials after ball milling into infrared Dried in a drying oven, sieved, and calcined to make a frit; the process parameters for preparing the frit in the specific examples are shown in Table 1.
[0022] Table 1
[0023]
Example
MgO
%
Nb 2 o 5
%
Milling time
(h)
Calcination temperature
℃
Calcination time
(h)
1
42％
58％
6
1010
5
2
42％
58％
4
1010
6
...
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Abstract
The invention discloses an Mg4Nb2O9 high-frequency dielectric ceramic with low dielectric constant and high Q value. The dielectric ceramic contains the following component according to mass percentage: 20-50% of MgO and 50-80% of Nb2O5. The invention also discloses a production method of the dielectric ceramic. The method comprises the following steps: (1) material compounding; (2) oven-drying; (3) calcination smelting; (4) ball-milling and oven-drying; (5) granulation, compression-molding of blanks and sintering; and (6) silver coating, electrode roasting and lead wire welding. The Mg4Nb2O9 high-frequency dielectric ceramic is obtained by solid-phase production. The dielectric constant of the dielectric ceramic is less than 15, and the Q.f value measured under microwave is more than 230000 (f is equal to 12.123 GHz). The production process is simplified without contamination during the whole process. The Mg4Nb2O9 high-frequency dielectric ceramic is used in the fields of mobile communication and satellite communication.
Description
technical field [0001] The invention relates to electronic information materials and electronic components, in particular to a high-frequency dielectric ceramic characterized by components and a preparation method thereof. Background technique [0002] With the rapid development of mobile communication and satellite communication technology, microwave dielectric ceramic materials have attracted more and more attention. In the high-frequency microwave range, the basic requirements of microwave dielectric ceramic materials are to have suitable dielectric constant, low dielectric loss, high quality factor (Q value) and small frequency temperature coefficient. Therefore, the development of high Q value (quality factor Q=1 / tanδ) materials have important significance and value. [0003] Mg 4 Nb 2 o 9 Since its discovery in the 1960s, it has been studied a lot. Mg 4 Nb 2 o 9 Ceramics have low dielectric loss and are compatible with Al 2 o 3 have the same crystal structure...
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IPC IPC(8): C04B35/495C04B35/622H01L41/187H10N30/853
Inventor 李玲霞李佳张平王洪茹张志萍
Owner TIANJIN UNIV