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Cobalt doped niobium zinc titanate microwave dielectric ceramics and preparation method thereof

A technology of microwave dielectric ceramics, zinc niobate titanate, applied in ceramics, inorganic insulators, etc., can solve the problems of narrowing the application range of microwave ceramics, the inability to use base metal electrodes such as Cu, and high sintering temperature

Inactive Publication Date: 2012-12-12
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Therefore ZnTiNb 2 o 8 As a microwave dielectric material, microwave dielectric ceramics in the system mainly have the following problems: (1) The sintering temperature is too high, and after the sintering temperature is lowered by doping sintering aids, the dielectric properties will decrease significantly; (2) τ f Negative, the temperature stability is not good enough; (3) The compatibility between the ceramic body and the metal inner electrode such as silver is not good enough, and a silver-palladium electrode with a higher proportion of palladium is required
[0004] Generally speaking, when the sintering temperature of the system is higher than 1080°C, base metal electrodes such as Cu cannot be used in the production of electronic components such as MLCC, which will greatly increase the cost
while τ f Negative will not be applied to electronic components with high thermal stability requirements, which will greatly reduce the application range of microwave ceramics, which is fatal to microwave ceramics

Method used

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  • Cobalt doped niobium zinc titanate microwave dielectric ceramics and preparation method thereof

Examples

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preparation example Construction

[0029] The preparation method of the present invention is as follows:

[0030] (1) Ingredients

[0031] The raw materials ZnO, Nb 2 o 5 、TiO 2 、Co 2 o 3 Press (Zn 1-x co x )TiNb 2 o 8 , where the stoichiometric ratio of 0<x≤0.40 is mixed and put into a ball mill tank. The ball milling medium is water and agate balls. The weight ratio of balls:material:water is 2:1:0.6. The ball mills for 6 hours and the speed is 750 rpm / min, put the mixture into an oven to dry at 90°C, put it into a mortar and grind it, and pass through a 40-mesh sieve;

[0032] (2) synthesis

[0033] Put the ground and sieved powder in step (1) into the crucible, compact it, cover it, seal it, synthesize it in a synthesis furnace at 1100°C, keep it warm for 4 hours, cool it down to room temperature naturally, and take it out of the furnace;

[0034] (3) Tablet

[0035]Secondary ball milling, drying and sieving of the synthetic material in step (2), adding 5wt% to 7wt% polyvinyl alcohol aqueous so...

specific Embodiment

[0043] x=0.10, the sintering temperature is 1025°C, 1050°C, 1075°C, 1100°C, 1125°C, respectively recorded as Examples 1-1, 1-2, 1-3, 1-4, 1-5

[0044] x=0.20, the sintering temperature is 1025°C, 1050°C, 1075°C, 1100°C, 1125°C, which are respectively recorded as Examples 2-1, 2-2, 2-3, 2-4, and 2-5;

[0045] x=0.30, the sintering temperature is 1025°C, 1050°C, 1075°C, 1100°C, 1125°C, respectively recorded as Examples 3-1, 3-2, 3-3, 3-4, 3-5;

[0046] x=0.40, the sintering temperature is 1025°C, 1050°C, 1075°C, 1100°C, 1125°C, which are respectively recorded as Examples 4-1, 4-2, 4-3, 4-4, and 4-5;

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Abstract

The invention discloses cobalt doped niobium zinc titanate microwave dielectric ceramics and a preparation method thereof. The dielectric ceramics comprise the following component by mole percentage: (Zn1-xCox)TiNb2O8, wherein x is greater than 0 and smaller than or equal to 0.40. In the invention, ZnTiNb2O8 system microwave dielectric ceramics are adopted as the basis. A traditional oxide mixing method is employed, and Co2O3 is added for doping modification, thus obtaining the (Zn0.7Co0.3)TiNb2O8 microwave dielectric ceramic material with good comprehensive performance. The provided microwave ceramics have a relatively low sintering temperature and good comprehensive performance. When the sintering temperature is 1075DEG C, epsilon r=35.93, Q*f=35125GHz, and tau f=0ppm / DEG C. The microwave dielectric ceramics provided in the invention are mainly used in MLCC ceramic devices co-fired with base metal inner electrodes at a low temperature.

Description

technical field [0001] This invention relates to ceramic compositions characterized by composition, especially ZnTiNb 2 o 8 System microwave dielectric ceramics. Background technique [0002] Microwave dielectric ceramics are ceramics used as dielectric materials in microwave frequency circuits and undertake one or more functions. They are the basic materials for manufacturing core components of microwave communication equipment, spanning the two major fields of information communication and materials. Frequency stabilized oscillators, filters and frequency discriminators in electronic countermeasures, navigation, communications, radar and other equipment have a very wide range of applications. It can also be used as a microwave circuit carrier, dielectric antenna, dielectric waveguide circuit, etc., and can meet the requirements of miniaturization, integration, high reliability and low cost of microwave circuits. It occupies an extremely important position in various fie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622H01B3/12
Inventor 孙清池郇正利马卫兵王丽婧
Owner TIANJIN UNIV
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