Preparation method of porous field pyroelectric ceramic material

A pyroelectric ceramic and field-induced technology, which is used in ceramic products, electrical radiation detectors, household appliances, etc. The effect of electric coefficient, good comprehensive pyroelectric performance

Inactive Publication Date: 2010-01-13
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although BST series materials have low dielectric loss and appropriate dielectric constant, but their pyroelectric coefficient is small, it is difficult to meet the requirements of modern pyroelectric devices

Method used

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  • Preparation method of porous field pyroelectric ceramic material
  • Preparation method of porous field pyroelectric ceramic material

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0021] According to the chemical formula Ba 0.67 Sr 0.33 TiO 3 +0.6mol%Mn+1.2mol%Y, the analytically pure BaTiO 3 , SrTiO 3 powder and Mn(NO 3 ) 2 , Y(NO 3 ) 3 The solution is configured with BST ceramic powder according to the stoichiometric ratio in the respective chemical formulas. After ball milling, crushing, drying, and sieving, they are pre-fired at 1000°C for 2 hours, and ball milling, drying, and sieving are performed again. The pre-fired powder is uniformly mixed with polymethyl methacrylate (PMMA) powder and then pre-pressed (the molding process includes two steps of pre-forming and cold isostatic pressing), PMMA powder and pre-sintered The mass ratio of the powder is 1:100. Then keep it at 600°C for 2 hours to discharge organic matter such as PMMA, and keep it at 1200°C for 0.5 hour for sintering. The sintered samples were covered with silver and fired electrodes for testing.

[0022] Among them, the doping of manganese and yttrium is Mn(NO 3 ) 2 and Y(...

example 2-3

[0025] According to the chemical formula Ba 0.67 Sr 0.33 TiO 3 +0.6mol%Mn+1.2mol%Y, the analytically pure BaCO 3 , SrCO 3 、TiO 2 powder and Mn(NO 3 ) 2 , Y(NO 3 ) 3 Mixing is carried out according to the stoichiometric ratio in the respective chemical formulae.

[0026] The pre-burned BST powder was mixed with 3% and 5% starch, and kept at 500°C for 2 hours to remove the pore-forming agent. All the other are the same as Example 1, and the process parameters are shown in Table 2. Its performance is shown in Table 3.

example 4-5

[0028] The material was kept at 1230° C. and 1260° C. for 2 hours, and the rest were the same as in Example 1. The process parameters are shown in Table 2. Its performance is shown in Table 3.

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Abstract

The invention discloses a method for preparing a porous barium strontium titanate field pyroelectric ceramic, comprising the following steps: firstly, mixing raw materials according to a stoichiometric ratio of respective chemical formula; pre-sintering the mixture at 800-1200 DEG C for 1-6 hours to obtain pre-sintered ceramic powder; then adding an organic substance pore-forming agent, mixing uniformly, tabletting and forming; heating again to remove organic substances; sintering, grinding, cleaning, adding an electrode and sintering the electrode. The porous BST field pyroelectric ceramic of the invention has the advantages of high pyroelectric coefficient, low dielectric loss, proper dielectric constant and excellent comprehensive pyroelectric property, and meets the requirements for manufacturing pyroelectric infrared detectors.

Description

technical field [0001] The invention belongs to a method for preparing a pyroelectric ceramic material, in particular to a method for preparing a porous high-performance barium strontium titanate (BST) field-induced pyroelectric ceramic material. Background technique [0002] Among various materials, pyroelectric ceramic materials have a series of advantages such as simple manufacturing process, low cost, stable and reliable performance, easy processing, good mechanical properties, and high electrical strength, so that they can be used in high temperature, high power and harsh environments. used under the conditions. At present, ordinary ceramics are mainly used in commercial production. This material is usually barium strontium titanate (BST) dense ceramics, which is characterized by field-induced pyroelectric effect, high mechanical strength, good processability and consistency. It has good reusability and high yield in the industrial production process of making detector...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J5/10C04B38/06
Inventor 张光祖姜胜林曾亦可张洋洋张清风喻研
Owner HUAZHONG UNIV OF SCI & TECH
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