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Low temperature sintering microwave ceramic material and preparation thereof

A microwave ceramic and low-temperature sintering technology, applied in ceramics, inorganic insulators, etc., can solve the problems of affecting the performance of dielectric tunable microwave ceramic materials, reducing the BST sintering temperature, and unstable dielectric properties, achieving excellent microwave performance, reducing Sintering temperature, low cost effect

Inactive Publication Date: 2009-07-22
TONGJI UNIV
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Problems solved by technology

[0006] There are generally three ways to reduce the sintering temperature: doping with low-sintering additives; chemical methods to prepare highly active powders; As a result, however, research on BST low-grade fever is still in its infancy
Among them, when there are too many doped low-burning additives, the dielectric loss is relatively large, and if the content is too low, the sintering performance is poor and the dielectric properties are unstable. The preparation of powder by chemical methods is troublesome in process and high in cost, and it is extremely difficult for industrial production.
Y.Lu and J.Jean. By adding Li 2 O-B 2 o 3 -SiO 2 -CaO-Al 2 o 3 , reduces the sintering temperature of BST, but its tuning rate is less than 8%
Rhim et al. added a small amount of B 2 o 3 lowered its sintering temperature, but when B 2 o 3 When the added amount exceeds 1.0wt%, its dielectric properties will deteriorate due to the formation of the second phase
Generally speaking, the composition ratio of the sintering aid will affect the performance of dielectrically adjustable microwave ceramic materials. If the content of the sintering aid is too low, the sintering effect will not be obvious during the sintering process. , the dielectric properties are poor

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  • Low temperature sintering microwave ceramic material and preparation thereof
  • Low temperature sintering microwave ceramic material and preparation thereof
  • Low temperature sintering microwave ceramic material and preparation thereof

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preparation example Construction

[0042] The preparation method of the BST-BCB low-temperature sintered dielectric adjustable microwave composite ceramic provided by the present invention specifically includes the following steps:

[0043] (1) BCB powder, a low-calorie additive, can be prepared by traditional electronic ceramic powder preparation methods and solid-state reaction methods: BaCO is selected 3 (99.99%), CuO (98%), H 3 BO 3 (99.5%) (its raw materials are all provided by Sinopharm Group Chemical Reagent Co., Ltd.) as the main raw material, according to the molar ratio batching in the molecular formula, the prepared raw materials are placed in the nylon ball mill jar, add zirconia balls and dehydrated alcohol or Ball mill with deionized water for 20-24 hours, and pre-calcine at 500°C-1050°C for 0.5-15 hours after discharge drying, more preferably at 700-900°C for 1-5 hours, and obtain BCB powder after calcining and grinding Material spare.

[0044] (2) Using high-purity BaTiO 3 , SrTiO 3 , mix t...

Embodiment 1

[0050] 1. Preparation of BST:

[0051] with Ba 0.40 Sr 0.60 TiO 3 as an example. Using high-purity BaTiO 3 , SrTiO 3 , mix the main ingredients, add deionized water according to the weight ratio of the mixture and deionized water 1:1, mix for 24 hours by wet ball milling, dry, place in a crucible, and pre-fire at 1000 ° C for 2 hours to obtain the final product The structure is Ba 0.40 Sr 0.60 TiO 3 . Ball mill again for 24 hours, after discharge, it is dried and ground into powder at 110°C, and passed through a 200-mesh sieve to obtain BST material.

[0052] 2. Preparation of BCB:

[0053] According to the molecular formula, according to a certain molar ratio, weigh the BaCO 3 , CuO, H 3 BO 3 As the main raw material, the prepared raw material is placed in a nylon ball mill tank, and zirconia balls and absolute ethanol or deionized water are added to ball mill for 20 hours. After the discharge is dried, it is pre-calcined at 900°C for 5 hours, and BCB is obtained...

Embodiment 2

[0071] 1. Preparation of BST:

[0072] with Ba 0.40 Sr 0.60 TiO 3 as an example. Using high-purity BaTiO 3 , SrTiO 3 , mix the main ingredients, add deionized water according to the weight ratio of the mixture to deionized water 1:2, mix for 24 hours by wet ball milling, dry, place in a crucible, and pre-fire at 1300 ° C for 8 hours to obtain the final product The structure is Ba 0.40 Sr 0.60 TiO 3 . Ball mill again for 24 hours, after discharging, it is dried and ground into powder at 300°C, and passed through a 100-mesh sieve to obtain BST material.

[0073] 2. Preparation of BCB:

[0074] According to the molecular formula, according to a certain molar ratio, weigh the BaCO 3 , CuO, H 3 BO 3 As the main raw material, put the prepared raw material in a nylon ball mill jar, add zirconia balls and absolute ethanol or deionized water balls for 20 hours, and pre-calcine at 700°C for 0.5 hours after discharging the material, and grind to obtain BCB. According to the...

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Abstract

The invention belongs to the field of electronic material and apparatus, in particular relates to a low-temperature sintering microwave ceramics material and a preparation method thereof. The low-temperature sintering microwave ceramics material comprises components with the following molar percentage: 90.0 percent to 99.5 percent of Ba(1-x)SrxTiO3(x is equal to 0.2 to 0.7) as well as 0.5 percent to 10.0 percent of BaCu(B2O5). The invention develops a BST-BCB double-phase composite microwave ceramics material which has the advantages of dielectric constant seriation, low dielectric loss (high Q value) and higher modulation rate under a microwave frequency band and can be used on an adjustable microwave apparatus by carrying out composition to a microwave medium material BCB and a BST ferroelectric material.

Description

technical field [0001] The invention belongs to the technical field of electronic materials and devices, and in particular relates to a low-temperature sintered microwave ceramic material and a preparation method thereof. Background technique [0002] In recent years, ferroelectric ceramics have been used to make ferroelectric storage memories, pyroelectric detector arrays, Piezoelectric motors, ferroelectric ceramic capacitors, ferroelectric sensor arrays, ferroelectric microwave devices, ferroelectric optics, and integrated optics. It can be widely used in many fields such as microelectronics, integrated optics, and micromechanics. With the advancement of ferroelectric ceramic technology and the development of application fields, the development and research of ferroelectric, piezoelectric, pyroelectric, electro-optic, nonlinear optics and many other functions of semiconductor large-scale integrated circuits and ferroelectric multilayer ceramics are integrated. The multi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/47C04B35/63H01B3/12
Inventor 翟继卫姜海涛沈波
Owner TONGJI UNIV
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