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Two-phase compound microwave medium ceramic material and preparation method thereof

A technology of microwave dielectric ceramics and ceramic materials, applied in the field of material science, can solve the problem of low Qf value, achieve the effects of good reproducibility, flexible preparation process, and large industrial application value

Active Publication Date: 2014-04-16
JIAXING GLEAD ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

"Microwave dielectric properties of Li 1+x-y m 1-x-3y Ti x+4y o 3 (M=Nb 5+ , Ta 5+ ) solid solutions" reported the dielectric properties of Li-Nb(Ta)-Ti system microwave dielectric ceramics: εr is 55~78, the Qf value is up to 9000GHz, τf is adjustable, but the Qf value is low

Method used

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  • Two-phase compound microwave medium ceramic material and preparation method thereof
  • Two-phase compound microwave medium ceramic material and preparation method thereof
  • Two-phase compound microwave medium ceramic material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1~5

[0028] According to the process of preparation method 1 (twice synthesis method), the material preparation is carried out:

[0029] 1) Press Ba 4 SM 9.33 Ti 18 o 54 Stoichiometric proportioning and weighing of the main ingredient BaCO 3 、Sm 2 o 3 and TiO 2 , according to the mass ratio of mixture and deionized water 1:1, add deionized water, use wet mixing method for 18 hours and then set at 120 o C is dried, and the dried mixture is passed through a 40-mesh sieve, and packed into an alumina crucible, at 1200 o Calcining for 3h under C to synthesize the main crystal phase, which is used as a ceramic base material after grinding for subsequent use;

[0030] 2) Press BaTi 4 o 9 Stoichiometric proportioning and weighing of the main ingredient BaCO 3 and TiO 2 , according to the weight ratio of mixture and deionized water 1:1.2, add deionized water, use wet mixing method for 18h and then set at 120 o C is dried, and the dried mixture is passed through a 40-mesh sieve,...

Embodiment 6~18

[0036] According to the process of preparation method 2 (one-time synthesis method), according to 66.1wt%Ba 4 SM 9.33 Ti 18 o 54 +33.9 wt%BaTi 4 o 9 The stoichiometric ratio of the high-purity (99.0%) main material BaCO was weighed separately 3 、Sm 2 o 3 and TiO 2 , The weighed amounts were 26.65g, 27.48g and 45.86g respectively. According to the mass ratio of mixture and deionized water 1:1.2, add deionized water, use wet mixing method for 18 hours, and then mix at 120 o C drying. The dried mixture is passed through a 40-mesh sieve, and packed into an alumina crucible, at 1130 o Calcined at C for 3h to synthesize the base material. According to the composition ratio of Table 2, add Al in the prepared base material 2 o 3 、 Bi 2 o 3 , MnO (or MnCO 3 ) of one or several additives. Use ZrO 2 Grinding balls, add deionized water according to the weight ratio of mixture and deionized water 1:1.2, use wet mixing for 4 hours and then set at 120 o C drying, adding 8...

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Abstract

The invention relates to a two-phase compound microwave medium ceramic material applied to microwave components such as dielectric resonators, filters, GPS (Global Positioning System) medium antennae and the like in a communication system, and a preparation method thereof, which belong to the technical field of material science. A raw material formula of the ceramic material consists of (100-x) percent by weight of Ba4Sm9.33Ti18O54, x percent by weight of BaTi4O9 and y percent by weight of MO, wherein x and y refer to mass fractions; x is more than or equal to 30 and less than or equal to 40; y is more than or equal to 0 and less than or equal to 1.0; and MO is one or more of metal oxides, i.e., Al2O3, BiO3 and MnO. In the two-phase compound microwave medium ceramic prepared with the method, epsilon is 57-75, Q*f=9,600-11,970GHz, and tauf is adjustable. The epsilonr of the material is about 60, the Qf value is high, the ceramic material is merely reported internationally at present, the requirements of microwave components such as GPS medium antennae and the like on a microwave medium ceramic material of which the dielectric constant is about 60 can be met, and a preparation process is simple and flexible and has high reproducibility, so that the two-phase compound microwave medium ceramic material has extremely high industrial application value.

Description

technical field [0001] The invention relates to a two-phase composite microwave dielectric ceramic material and a preparation method thereof for microwave components such as dielectric resonators, filters, GPS dielectric antennas in communication systems, and belongs to the field of material science and technology. Background technique [0002] Microwave dielectric ceramics are the core materials of microwave devices. With the rapid development of communication technology, a large number of microwave dielectric ceramic materials suitable for various microwave frequency bands have been developed. Dielectric ceramic materials used in microwave circuits should generally meet: (1) high relative permittivity εr to reduce device size, generally requiring εr≥20; (2) high quality factor Q or Qf value to reduce Loss; (3) Frequency temperature coefficient τf close to zero to ensure the temperature stability of the device. [0003] The microwave dielectric ceramics currently develope...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/468C04B35/50C04B35/622
Inventor 童建喜叶春燕
Owner JIAXING GLEAD ELECTRONICS CO LTD
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