Pyroelectric ceramic material and preparation method thereof

A technology of pyroelectric ceramics and raw materials, which is applied in the field of functional ceramic materials, can solve the problems of increased phase transition temperature range, increased product cost, and false reporting, and achieves the effect of high pyroelectric coefficient

Inactive Publication Date: 2019-06-07
扬州江嘉科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However The phase change temperature range is very narrow, usually only 2~3°C. When the ambient temperature of the detector changes greatly, the sensitivity of the detector will drop significantly, which will cause false alarms and missed alarms.
[0007] In order to improve this problem, the current common practice of commercial pyroelectric ceramic materials is: 1. Broaden the phase change temperature range by doping and modifying ceramic materials. The problem with this method is that the increase in the phase change temperature range is limited, and the pyroelectric The overall coefficient will be reduced; Second, the sensor sensitivity of the detector is increased by reducing the volume of the ceramic (thinning), so that the material has a higher detection sensitivity when the ambient temperature deviates from the phase transition temperature, but this method ceramics The thickness usually needs to be reduced to 0.1mm or less, which will inevitably be accompanied by unfavorable factors such as increased difficulty in ceramic processing, reduced production efficiency, and reduced yield, which will significantly increase product costs

Method used

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  • Pyroelectric ceramic material and preparation method thereof
  • Pyroelectric ceramic material and preparation method thereof
  • Pyroelectric ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] respectively according to

[0033]

[0034] will analyze pure Pb 3 o 4 , ZrO 2 、TiO 2 , Nb 2 o 5 , Fe 2 o 3 , ZnO, La 2 o 3 , SrCO 3 The raw materials are prepared according to the stoichiometric ratio of three kinds of powders A, B, and C, wherein x=0.008, y=0.03, z=0.02; the prepared three kinds of powders are mixed evenly according to the wet ball milling method, specifically, the wet The ball milling process is: material: grinding medium: deionized water = 1:2:0.8, the grinding medium is zirconium balls of Φ6mm~Φ16mm, and the ball milling time is 12 hours; Carry out airtight pre-firing in an aluminum crucible according to the synthesis process in Table 2.

[0035] Component

Pre-burning temperature (°C)

Holding time (h)

A

980

4

B

950

4

C

930

4

[0036] Preliminary crushing of pre-burned A, B, and C materials and analysis of pure MnO 2The raw materials were weighed and prepared according to the ...

Embodiment 2

[0046] The difference between Example 2 and Example 1 is that the three-component calcining process of A, B, and C is different. The specific calcining process is shown in Table 6, and the A and B components used in Examples 2-1~2-3 , C three component mass ratio and MnO 2 The addition amount corresponds to Example 1-1~1-3 (Table 3), and other preparation steps are exactly the same as Example 1, and the performance parameters of the obtained pyroelectric ceramic material are shown in Table 4 and Table 5.

[0047] Component

[0048] Industrial Applicability: It can be seen from the above introduction that the pyroelectric ceramic material prepared by the present invention has a higher pyroelectric coefficient at room temperature, a lower dielectric loss, and a moderate dielectric constant. Compared with the prior art In the temperature range of 10°C~80°C, the pyroelectric coefficient and detection value are relatively high, and the thickness of the ceramic sheet is ab...

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PUM

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Abstract

The invention relates to a pyroelectric ceramic material and a preparation method thereof. The prepared zirconium-rich pyroelectric ceramic material has high pyroelectric coefficient in the temperature range of 10-80 DEG and high figure of merit of detectivity. A pyroelectric infrared sensor manufactured bu using the ceramic material has a high-level sensor sensitivity in the temperature range of10-80 DEG C in the case of thick ceramic, for example, ceramic of 0.15 mm thick, and the requirements of manufacture of high performance infrared pyroelectric sensors are met.

Description

technical field [0001] The invention relates to a pyroelectric ceramic material and a preparation method thereof, in particular to a pyroelectric ceramic material with high pyroelectric coefficient, low dielectric loss, suitable dielectric constant and high detection merit value in a wide temperature range. The zirconium-rich pyroelectric material belongs to the technical field of functional ceramic materials. Background technique [0002] The passive pyroelectric infrared sensor works by using the pyroelectric effect of the material, and it detects the target through the temperature difference between the target and the background. Although its response speed is not as good as that of the photon type, it is easy to use because it can be used at room temperature, has a wide spectral response, and has a wide operating frequency, and its sensitivity has nothing to do with wavelength. This sensor has high sensitivity and wide detection range, and is a highly reliable detector....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/491C04B35/622C04B35/626C04B41/88
Inventor 严盛喜赵明陈域陈思源汪玮玺
Owner 扬州江嘉科技有限公司
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