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Microwave dielectric ceramics doped with cobalt oxide and niobium zinc titanate

A technology of microwave dielectric ceramics and zinc niobate titanate, applied in the field of microwave dielectric ceramics, can solve problems such as insufficient temperature stability, high sintering temperature, and narrowing the application range of microwave ceramics

Inactive Publication Date: 2013-04-24
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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  • Microwave dielectric ceramics doped with cobalt oxide and niobium zinc titanate
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  • Microwave dielectric ceramics doped with cobalt oxide and niobium zinc titanate

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preparation example Construction

[0035] The preparation method of the present invention is as follows:

[0036] (1) Ingredients

[0037] The raw materials ZnO, Nb 2 o 5 、TiO 2 and Co 2 o 3 Press (Zn 1-x co x )TiNb 2 o 8 The stoichiometric ratio, mixed into the ball mill tank, at the same time, the raw material BaCO 3 , CuO and B 2 o 3 Press BaCu(B 2 o 5 ) metering ratio, mixed and put into another ball mill tank; the ball mill media are deionized water and zirconia balls, the weight ratio of ball: material: water is 2:1:0.6; ball mill 6h, the speed is 750 rpm Then put the mixed materials into the oven to dry at 90°C, then put them into the mortar for grinding, and pass through 40-mesh sieve respectively;

[0038] (2) synthesis

[0039] Put the two groups of powders sieved in step (1) into crucibles respectively, compact them, cover them, seal them, synthesize them in a synthesis furnace at 1100°C and 700°C respectively, keep them warm for 4 hours, and cool down to room temperature naturally. b...

specific Embodiment

[0052] x=0.32, the sintering temperature is 950°C, 975°C, 1000°C, and 1025°C, which are respectively recorded as Examples 1-1, 1-2, 1-3, and 1-4;

[0053] x=0.34, the sintering temperature is 950°C, 975°C, 1000°C, and 1025°C, which are respectively recorded as Examples 2-1, 2-2, 2-3, and 2-4;

[0054] x=0.36, the sintering temperature is 950°C, 975°C, 1000°C, and 1025°C, which are respectively recorded as Examples 3-1, 3-2, 3-3, and 3-4;

[0055] x=0.38, the sintering temperature is 950°C, 975°C, 1000°C, and 1025°C, which are respectively recorded as Examples 4-1, 4-2, 4-3, and 4-4;

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Abstract

The invention discloses a microwave dielectric ceramics doped with Co2O3 (cobalt oxide) and niobium zinc titanate and a preparation method of the microwave dielectric ceramics. The chemometry formula is (Zn1-xCox) TiNb2O8-1 wt. % BaCu (B2O5); BaCu (B2O5) is BCB for short; in the formula, x is equal to 0.32-0.38. The (Zn1-xCox) TiNb2O8-1wt. % BCB microwave dielectric ceramics with a good comprehensive performance is prepared by the step of adding Co2O3 to a ZnTiNb2O8-1wt. %BCB system microwave dielectric ceramics serving as a base by by a traditional oxide mixing method to reduce a sintering temperature. The microwave ceramics is low in sintering temperature and good in comprehensive performance; the best sintering temperature is 975 DEG C, wherein epsilon r is equal to 33.04, Q*f is equal to 22000GHz, and Tauf is equal to -2.7 ppm / DEG C. The microwave dielectric ceramics is mainly applied to MLCC (Multiplayer Ceramic Chip Capacitors) ceramics device co-fired with a base metal electrode at a low temperature, and has wide application in industries such as information, war industry, mobile communication, electronic and electrical appliances, aviation, oil exploration and the like.

Description

technical field [0001] The present invention relates to the ceramic composition characterized by composition, especially relates to (Zn 1-x co x )TiNb 2 o 8 -1wt.%BaCu (B 2 o 5 ) (referred to as BCB) system microwave dielectric ceramics. Background technique [0002] Microwave dielectric ceramics (MWDC) refer to ceramics that are used as dielectric materials in microwave frequency bands (mainly UHF, SHF frequency bands, 300MHz~300GHz) circuits and perform one or more functions. A hot direction in the field. This is mainly to meet the development needs of microwave mobile communications. Microwave has the characteristics of short wavelength and strong directionality, so it is very suitable for radar to find and track targets. In addition, microwave has high frequency (0.3~3000GHz), wide frequency bandwidth, large information capacity, and strong penetrating ability, and is widely used in various communication services, including microwave multi-channel communication, ...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622C04B35/64
Inventor 马卫兵陈天凯孙清池郇正利唐翠翠
Owner TIANJIN UNIV
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