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A method for preparing field pyroelectric ceramic material

A pyroelectric ceramic and field induced technology, which is applied in the field of preparing field pyroelectric ceramic materials and preparing low-loss and high-performance barium strontium titanate field pyroelectric ceramic materials, and can solve the problem of weakening infrared detection ability and pyroelectricity. Problems such as decrease in electrical coefficient

Inactive Publication Date: 2011-12-14
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although ordinary doping can suppress dielectric loss, it will also reduce the pyroelectric coefficient and weaken its infrared detection ability

Method used

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  • A method for preparing field pyroelectric ceramic material
  • A method for preparing field pyroelectric ceramic material
  • A method for preparing field pyroelectric ceramic material

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0039] According to the chemical formula Ba 0.68 Sr 0.32 TiO 3 +10mol% Mn, will be analytically pure BaTiO 3 , SrTiO 3 powder and Mn(NO 3 ) 2 The solution is configured with BST ceramic powder according to the stoichiometric ratio in the respective chemical formulas. After being ball milled, crushed and sieved, it is pre-fired at 1100°C for 2 hours, and the pre-fired powder is uniformly mixed with the binder polyvinyl alcohol. Mixing, granulation, molding (the molding process includes two steps of preforming and cold isostatic pressing). Then keep it at 600°C for 2 hours to discharge the binder, and keep it at 1400°C for 0.5 hour for sintering to obtain heavily doped BST ceramics. Thereafter, after the ceramics are pulverized by high-energy ball milling, they are evenly mixed with pure pre-synthesized BST powder (mixing ratio is 1:20, mass ratio), and then paraffin wax binder is added, granulated and formed (wherein the forming process includes pre-synthesized Forming a...

example 2

[0043] The heavily doped BST ceramic powder was mixed with the pre-synthesized pure BST powder at a mass ratio of 1:100. The final sintering temperature of ceramics is 1350°C, and the holding time is 2h. 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.

[0044] Example 3-4:

[0045] The chemical formula of heavily doped BST is Ba 0.68 Sr 0.32 TiO 3 +20mol%Mn+60mol%Y, the pre-calcination temperature is 1000°C, and the temperature is kept for 6 hours, and the analytically pure BaCO 3 , SrCO 3 、TiO 2 powder and Mn(NO 3 ) 2 , Y(NO 3 ) 3 Mix according to the stoichiometric ratio in the chemical formula. The sintering temperature of medium-doped BST is 1300℃, and the holding time is 2h.

[0046] The heavily doped BST ceramic powder and the pre-synthesized pure BST powder were mixed at a mass ratio of 1:40 and 1:70. The binder used for the two granulations was paraffin wax, and the binder disch...

example 5

[0048] With the heavily doped element Mn (NO in the example 3-4 3 ) 2 and Y(NO 3 ) 3 The solution was changed to MgO and Nb respectively 2 o 5For powder, the doping amount is the same as in Example 3-4, the calcining temperature is 1200°C, and the holding time is 1h. The adhesive is deionized water, and the adhesive discharge process is: 100°C, heat preservation for 1h. The final sintering temperature of the ceramics is 1300°C and the temperature is kept for 2.5h. 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.

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Abstract

The invention discloses a method for preparing strontium barium titanate field-induced pyroelectric ceramics. The heavily doped BST ceramic powder is mixed with the pure pre-synthesized BST powder according to a certain mass ratio; agent, mixed uniformly and granulated, then pressed into tablets; reheated to discharge the binder; sintered, ground, cleaned, applied and fired. The BST field-induced pyroelectric ceramic prepared by the invention has a high pyroelectric coefficient, low dielectric loss and a suitable dielectric constant, has good comprehensive pyroelectric performance, and meets the requirements for making pyroelectric infrared detectors .

Description

technical field [0001] The invention belongs to ceramic material preparation technology, in particular to a method for preparing field pyroelectric ceramic material, which is used for preparing low loss and high performance barium strontium titanate (BST) field pyroelectric ceramic material. Background technique [0002] Among various materials, pyroelectric ceramic materials can be used under different environmental conditions due to their simple manufacturing process, low cost, stable and reliable performance, easy processing, good mechanical properties and high electrical strength. 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 detectors. [0003] In order to meet the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/465C04B35/622
Inventor 张光祖姜胜林曾亦可刘汉东喻研何俊刚
Owner HUAZHONG UNIV OF SCI & TECH
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