Method for preparing fine-grain lead scandium tantalate pyroelectric ceramic material

A technology of pyroelectric ceramics and lead tantalum scandate, which is applied in the field of pyroelectric ceramic material preparation to achieve the effects of small grain size, simple process and low cost

Active Publication Date: 2011-05-18
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing fine-grained lead tantalum scandate pyroelectric ceramic material by using liquid phase powder making and two-step sintering process, so as to solve the problem of the application of lead tantalum scandate pyroelectric ceramic material in non-refrigerating Performance Problems in Infrared Focal Plane Array Detectors and Meeting the Needs of Industrial Production

Method used

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  • Method for preparing fine-grain lead scandium tantalate pyroelectric ceramic material
  • Method for preparing fine-grain lead scandium tantalate pyroelectric ceramic material
  • Method for preparing fine-grain lead scandium tantalate pyroelectric ceramic material

Examples

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Embodiment 1

[0037] According to Pb(Sc 0.5 Ta 0.5 )O 3 The stoichiometric ratio and excess 0.3 ~ 3mol% take tantalum ethoxide, drop tantalum ethoxide into the mixed solvent formed by lactic acid and deionized water at a rate of 1 drop / 2 seconds, stir vigorously at room temperature for 24 hours, seal and stand still, Make the solution stable; wherein: the mass ratio of lactic acid to deionized water is 3:2, and the mass ratio of tantalum ethoxide to lactic acid is 1:1.

[0038] According to Pb(Sc 0.5 Ta 0.5 )O 3 The stoichiometric ratio and excess of 5 ~ 10mol% lead acetate was weighed and according to Pb (Sc 0.5 Ta 0.5 )O 3 Weigh scandium acetate, add deionized water to partially dissolve it, and form a suspension; add the obtained suspension to the tantalum ethoxide solution, add an appropriate amount of deionized water, and make the mass concentration of the formed mixed solution 15%; adjust the pH value of the mixed solution to 6.0 with ammonia water; fully stir to form Pb(Sc 0...

Embodiment 2

[0048] The difference between this example and Example 1 lies in the process conditions of the two-step sintering: heating up to 800°C at a heating rate of 3°C / min, and then stopping heating immediately after heating up to 1200°C at a heating rate of 10°C / min , and then cooled to 1050°C at a cooling rate of 30°C / min, kept for 20 hours, and finally cooled to room temperature with the furnace.

[0049] The remaining content of this embodiment is the same as that described in Example 1, and the performance test results of the prepared samples are shown in Table 1.

Embodiment 3

[0051] The difference between this example and Example 1 lies in the process conditions of two-step sintering: heating up to 800°C at a heating rate of 3°C / min, and then stopping heating immediately after raising the temperature to 1100°C at a heating rate of 10°C / min , and then cooled to 950°C at a cooling rate of 30°C / min, kept for 20 hours, and finally cooled to room temperature with the furnace.

[0052] The remaining content of this embodiment is the same as that described in Example 1, and the performance test results of the prepared samples are shown in Table 1.

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Abstract

The invention discloses a method for preparing a fine-grain lead scandium tantalate pyroelectric ceramic material by a liquid-phase method for preparing powder and a two-step sintering process. The method comprises the following steps of: preparing Pb(Sc0.5Ta0.5)O3 powder by a liquid-phase method; ball-milling the powder and drying; adding an adhesive and then performing aging, sieving, forming and the like to prepare a blank; and finally sintering the blank by a two-step method. The method for preparing the material has the advantages of simple process, no need of special equipment, low costand the like, is suitable for mass production and can meet industrial requirements. The prepared lead scandium tantalate pyroelectric ceramic material has the advantages of high compactness, fine grains, moderate dielectric constant, high pyroelectric coefficient and the like; and a pyroelectric detectivity optimal value of a sample can reach 72.9*10<-5>Pa<-1 / 2> in an offset electric field of 700V / mm, so the performance requirement of applying the material to an uncooled infrared focal plane array detector can be met.

Description

technical field [0001] The present invention relates to a preparation method of a lead tantalum scandate pyroelectric ceramic material, specifically, a method for preparing a fine-grained lead tantalum scandate pyroelectric ceramic material by sintering in two steps, belonging to pyroelectric ceramics The field of material preparation technology. Background technique [0002] Infrared detection technology is an important direction for the development of high-tech fields in various countries in the world today. The growing market requires cost-effective, highly reliable, low power consumption, portable, uncooled infrared focal plane array (UFPA) detectors, which are mainly used in fire rescue, medical diagnosis and traffic monitoring. Uncooled infrared detectors have successively experienced thermocouples, thermopiles, thermistor microbolometers and other forms (see "Infrared and Laser Engineering", 35[4], 419-423, 2006). In the mid-1960s, people began to study pyroelectric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622
Inventor 董显林刘伟王根水姚春华
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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