Dielectric adjustable two-phase composite microwave ceramic material and preparation thereof

A technology of microwave ceramics and ceramic powders, applied in ceramics, inorganic insulators, etc., can solve the problem of undiscovered dielectric tunability, and achieve the effects of environmental protection, no toxic side effects, widening the scope of application, and excellent performance.

Inactive Publication Date: 2012-07-04
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] According to literature search, the existing technology is mainly to improve the comprehensive dielectric properties of barium titanate materials by ion substitution, doping modification or composite low-loss microwave dielectric materials in barium titanate materials, so as to improve its application in devices. The adaptability of low-heat microwave materials and barium titanate composite materials has not been found related to the technology of dielectric tunability

Method used

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  • Dielectric adjustable two-phase composite microwave ceramic material and preparation thereof
  • Dielectric adjustable two-phase composite microwave ceramic material and preparation thereof
  • Dielectric adjustable two-phase composite microwave ceramic material and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1. Preparation of BST:

[0044] 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 1200 ° C for 2 hours to obtain the final The product is (Ba 0.40 Sr 0.60 )TiO 3 . Ball milling again for 20h, drying and grinding at 110°C after discharge, and passing through a 100-mesh sieve to obtain (Ba 0.40 Sr 0.60 )TiO 3 Material.

[0045] 2. Preparation of ZST:

[0046] Choose high-purity ZrO 2 , SnO 2 ,TiO 2 , as the main raw material, according to a certain molar ratio, put the prepared raw materials in a nylon ball mill tank, add zirconia balls and absolute ethanol or deionized water ball mill for 24 hours, and pre-fire at 1100 ° C after drying 1 hour, Zr was obtained after grinding 0.8 sn 0.2 TiO 4 Powder spare.

[0047] 3, preparation preparation (Ba 0.4 Sr 0.6 )TiO 3 -(Zr 0.8...

Embodiment 2

[0051] 1. Preparation of BST:

[0052] 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 1200 ° C for 2 hours to obtain the final The product is (Ba 0.40 Sr 0.60 )TiO 3 . Ball mill again for 24h, after discharging, dry and grind at 300°C, and pass through a 200-mesh sieve to obtain (Ba 0.40 Sr 0.60 )TiO 3 Material.

[0053] 2. Preparation of ZST:

[0054] Choose high-purity ZrO 2 , SnO 2 ,TiO 2 , as the main raw material, according to a certain molar ratio, put the prepared raw materials in a nylon ball mill tank, add zirconia balls and absolute ethanol or deionized water ball mill for 24 hours, and pre-fire at 1500 °C after drying 5 hours, Zr was obtained after grinding 0.8 sn 0.2 TiO 4 Powder spare.

[0055] 3, preparation preparation (Ba 0.4 Sr 0.6 )TiO 3 -(Zr 0.8 sn 0.2 )...

Embodiment 3～8

[0059] 1. Preparation of BST:

[0060] 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 1200 ° C for 2 hours to obtain the final The product is (Ba 0.40 Sr 0.60 )TiO 3 . Ball mill again for 24h, after discharging, dry and grind at 300°C, and pass through a 200-mesh sieve to obtain (Ba 0.40 Sr 0.60 )TiO 3 Material.

[0061] 2. Preparation of ZST:

[0062] Choose high-purity ZrO 2 , SnO 2 ,TiO 2 , as the main raw material, according to a certain molar ratio, put the prepared raw materials in a nylon ball mill tank, add zirconia balls and absolute ethanol or deionized water ball mill for 24 hours, and pre-fire at 1500 °C after drying 5 hours, Zr was obtained after grinding 0.8 sn 0.2 TiO 4 Powder spare.

[0063] 3, preparation (Ba 0.4 Sr 0.6 )TiO 3 -(Zr 0.8 sn 0.2 )TiO 4 Compo...

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PUM

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Abstract

The invention belongs to the field of electronic material and apparatus, in particular relates to a dielectric adjustable double-phase composite microwave ceramics material. A low-temperature sintering microwave ceramics material disclosed in the invention comprises components with the following weight percentage: 40.0 wt% to 97.5 wt% of Ba(1-x)SrxTiO3, 2.5 wt% to 60.0 wt% of Zr(1-y)SnyTiO4, as well as 0 wt% to 15.0 wt% of ZnO. The invention develops the 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 Zr1-ySnyTiO4 and strontium-barium titanate ferroelectric material.

Description

technical field [0001] The invention belongs to the technical field of electronic materials and devices, and in particular relates to a two-phase composite microwave which has the characteristics of adjustable dielectric constant with the external DC electric field, low dielectric loss (high Q value) in the microwave frequency band, and can be used for adjustable microwave devices. Ceramic materials and methods for their preparation. Background technique [0002] Ba 1-x Sr x TiO 3 (BST for short) They are a typical ferroelectric material with perovskite structure, which has high dielectric constant, low dielectric loss and high dielectric tuning rate under DC electric field bias, and its critical temperature (Curie temperature , Curie point) can be continuously adjusted in a wide range with the composition ratio of Ba / Sr, so it is the most promising dielectric tunable material. Barium strontium titanate can be widely used in tunable microwave devices such as phase shifte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/468C04B35/47C04B35/46H01B3/12
Inventor 翟继卫姜海涛
Owner TONGJI UNIV
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