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Method for preparing BaTiO3 base PTCR ceramic micropowder

A technology of ceramic micropowder and ba2, which is applied in the field of preparation of BaTiO3-based PTCR ceramic micropowder, can solve the problems of mixed impurities, difficult operation and control of the preparation process, and avoid grain growth and agglomeration, low gel treatment temperature and high activity Effect

Inactive Publication Date: 2006-10-04
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires spray drying, the preparation process is not easy to operate and control, and it is easy to mix impurities

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Preparation containing Ba 2+ :Sr 2+ : Ti 4+ and Y 3+ A solution with a molar ratio of Ba 2+ :Sr 2+ : Ti 4+ : Y 3+ =0.744:0.25:1.02:0.006, the method for preparing the solution can be:

[0028] Barium Carbonate BaCO 3 : The molar ratio of citric acid=1:3, weighing 14.760g barium carbonate BaCO 3 With 47.110g citric acid, add deionized water to the citric acid to prepare a citric acid solution, then add barium carbonate BaCO 3 Slowly add, after the reaction is completed, get the 2+ The transparent solution, and add ammonia water to be 8 to pH;

[0029] strontium carbonate SrCO 3 : Molar ratio of citric acid=1:3, weighing 3.728g strontium carbonate SrCO 3 With 15.829g citric acid, add deionized water to the citric acid to prepare a citric acid solution, and then add strontium carbonate SrCO 3 Slowly added, after the reaction is completed, the obtained containing Sr 2+ transparent solution, and add ammonia water to pH 7; or press strontium carbonate SrCO ...

Embodiment 2

[0040] (1) Preparation containing Ba 2+ 、Sr 2+ 、Ti 4+ and Y 3+ A solution with a molar ratio of Ba 2+ :Sr 2+ : Ti 4+ : Y 3+ =0.7985:0.2:1.01:0.0015, the method for preparing the solution can be:

[0041] Barium Carbonate BaCO 3 : The molar ratio of citric acid=1:6, weighing 15.841g barium carbonate BaCO 3 With 101.117g citric acid, add deionized water to the citric acid to prepare a citric acid solution, then add barium carbonate BaCO 3 Slowly add, after the reaction is completed, get the 2+ The transparent solution, and add ammonia water to pH is 7;

[0042] strontium carbonate SrCO 3 : nitric acid = 1:2 molar ratio, weighing 2.982g strontium carbonate SrCO 3 and nitric acid, adding deionized water to nitric acid to prepare dilute nitric acid solution, and then strontium carbonate SrCO 3 Slowly added, after the reaction is completed, the obtained containing Sr 2+ transparent solution, and add ammonia water to pH 8; or press strontium carbonate SrCO 3 : Molar ra...

Embodiment 3

[0053] (1) Preparation containing Si 4+ solution, the method can be: according to the molar ratio of ethyl orthosilicate:citric acid=1:1.5, weigh 465mg ethyl orthosilicate Si(OC 2 h 5 ) 4 With 735mg citric acid, add deionized water to citric acid to prepare a citric acid solution, and then add tetraethyl orthosilicate Si(OC 2 h 5 ) 4 Add and stir, after the reaction is complete, get the Si containing 4+ transparent solution;

[0054] (2) Preparation containing Ba 2+ 、Sr 2+ 、Ti 4+ and Y 3+ A solution with a molar ratio of Ba 2+ :Sr 2+ : Ti 4+ : Y 3+ =0.767: 0.23: 1.015: 0.003, the method for preparing the solution can be:

[0055] Barium Carbonate BaCO 3 : The molar ratio of citric acid=1:4, weighing 15.216g barium carbonate BaCO 3 With 64.752g citric acid, add deionized water to the citric acid to prepare a citric acid solution, then add barium carbonate BaCO 3 Slowly add, after the reaction is completed, get the 2+ transparent solution, and add ammonia to pH...

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PUM

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Abstract

Production for BaTiO3-group PTCR ceramic micro-powder is carried out by: inducing organic monomer and cross-linking agent to transparent solution containing Ba2+, Sr2+, Ti4+, Y3+, monomer of solution and cross-linking agent cross-linking polymerizing to obtain gel under the action of evocating agent and catalyst, ion of solution curing in-situ, incinerating at 700-900deg.C to obtain powder doped BaTiO3, supersonic mixing for the mixed solution of Mn2+ and Si2+, and Mn2+ and Si2+ coating on the powder surface doped BaTiO3 to obtain BaTiO3-group PTCR ceramic micro-powder. Its advantages include high purity and chemical activity, small grain, low cost and simple process.

Description

technical field [0001] The invention belongs to the technical field of powder preparation, in particular to a BaTiO 3 The preparation method of base PTCR ceramic powder. Background technique [0002] In recent years, with the development of communication technology and surface mount technology, various electronic components continue to develop in the direction of miniaturization, chip type, integration, high reliability, and low power consumption. For BaTiO 3 PTCR-based electronic ceramics are required to have high temperature coefficient of resistance and high lift-to-drag ratio, which puts forward higher requirements for the accuracy of chemical composition of PTCR materials, powder purity, particle size, chemical uniformity, and sintering activity. Require. Since there are many components in PTCR ceramics, and in order to obtain a good PTCR effect, some components (sintering aids and acceptor impurities) are required to be distributed on the grain boundaries, which mak...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/622C04B35/468C04B35/626
Inventor 周东祥龚树萍郑志平胡云香刘欢
Owner HUAZHONG UNIV OF SCI & TECH
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