Pyroelectric ceramic material for passive pyroelectric infrared sensor and preparation method thereof

A technology of pyroelectric ceramics and pyroelectric infrared, applied in the field of piezoelectric ceramics, can solve the problems of pyroelectric performance attenuation, pyroelectric coefficient reduction, long-term short life, etc., and achieve small spontaneous polarization and low noise value , the effect of low phase transition temperature

Active Publication Date: 2018-02-02
SENBA SENSING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In recent years, as the application fields of passive infrared sensors have become more extensive, the existing pyroelectric ceramic materials have high noise values ​​in the actual application of pyroelectric infrared sensors, and the pyroelectric coefficient decreases with the increase of temperature. Electrical properties decay over time
Therefore, it causes false alarms from the sensor, short sensing distance in summer, and short long-term lifespan.

Method used

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  • Pyroelectric ceramic material for passive pyroelectric infrared sensor and preparation method thereof
  • Pyroelectric ceramic material for passive pyroelectric infrared sensor and preparation method thereof
  • Pyroelectric ceramic material for passive pyroelectric infrared sensor and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0037] The pyroelectric ceramic material of the present embodiment consists of: (Pb 1-x-y La x Sr y ) (Mn 1 / 3 Nb 2 / 3 ) z (Zr 0.94 Ti 0.06 ) 1-z o 3 ; where: x=0.01, y=0.02, z=0.05. The pyroelectric ceramic material is prepared by the following method: (1) using PbO, ZrO 2 、TiO 2 , Nb 2 o 5 , MnO 2 , SrCO 3 and La 2 o 3 Prepare the above powder raw materials according to the elemental ratio, and mix them by wet ball milling; (2) The mixed raw materials are pre-fired at 800°C and the holding time is 2 hours to form ceramic calcined powder after pressure filtration and drying (3) Add the sintering aid ZnO into the ceramic calcined powder, grind and mix to form a ceramic slurry, and the mass of the sintering aid is 0.50wt% of the ceramic calcined powder; (4) use the ceramic slurry Based on the mass of the ceramic slurry, add 10wt% binder, 1.0wt% plasticizer and 0.1wt% release agent to the ceramic slurry for spray granulation to form ceramic particles; (5) pre-pres...

Embodiment 2

[0039] The pyroelectric ceramic material of the present embodiment consists of: (Pb 1-x-y La x Sr y ) (Mn 1 / 3 Nb 2 / 3 ) z (Zr 0.94 Ti 0.06 ) 1-z o 3 ; where: x=0.01, y=0.02, z=0.05. The pyroelectric ceramic material is prepared by the following method: (1) using PbO, ZrO 2 、TiO 2 , Nb 2 o 5 , MnO 2 , SrCO 3 and La 2 o 3 As raw materials, prepare the above powder raw materials according to the elemental ratio, and mix them by wet ball milling; (2) After the mixed raw materials are press-filtered and dried, they are pre-fired at 900°C and the holding time is 1h to form ceramic calcined powder. (3) Grind and mix the calcined ceramic powder to form a ceramic slurry; (4) Based on the quality of the ceramic slurry, add 10wt% binder and 1.0wt% plasticizer to the ceramic slurry Spray granulation with 0.1wt% mold release agent to form ceramic particles; (5) pre-press and isostatically press ceramic particles to form ceramic cylinders; ℃, the holding time is 2h; (7) The...

Embodiment 3

[0041] The pyroelectric ceramic material of the present embodiment consists of: (Pb 1-x-y La x Sr y ) (Mn 1 / 3 Nb 2 / 3 ) z (Zr 0.94 Ti 0.06 ) 1-z o 3 ; where: x=0.01, y=0.02, z=0.06. The pyroelectric ceramic material is prepared by the following method: (1) using PbO, ZrO 2 、TiO 2 , Nb 2 o 5 , MnO 2 , SrCO 3 and La 2 o 3 Prepare the above powder raw materials according to the elemental ratio, and mix them by wet ball milling; (2) The mixed raw materials are pre-fired at 800°C and the holding time is 2 hours to form ceramic calcined powder after pressure filtration and drying (3) Add the sintering aid ZnO into the ceramic calcined powder, grind and mix to form a ceramic slurry, and the mass of the sintering aid is 0.50wt% of the ceramic calcined powder; (4) use the ceramic slurry Based on the mass of the ceramic slurry, add 10wt% binder, 1.0wt% plasticizer and 0.1wt% release agent to the ceramic slurry for spray granulation to form ceramic particles; (5) pre-pres...

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Abstract

The invention relates to a pyroelectric ceramic material for a passive pyroelectric infrared sensor, the chemical element composition of which is: (Pb1-x-yLaxSry) (Mn1 / 3Nb2 / 3)z(Zr0.94Ti0.06)1-zO3+ φat%A; where: 0.002≤x≤0.1, 0.01≤y≤0.1, 0.01≤z≤0.1; where, φ=0 or 2.8≤φ≤5.5, said A is a mixture of B2O3 and Cr2O3, the two The molar ratio is 1:1. The pyroelectric ceramic material of the present invention has a low sintering temperature and a wide sintering temperature range, and because of the low phase transition temperature, small spontaneous polarization, low dielectric constant and dielectric loss, the passive infrared pyroelectric sensor produced has noise Low value, high sensitivity, long detection distance; suitable for making sensors such as pyroelectric passive infrared sensors and uncooled focal plane infrared sensors.

Description

technical field [0001] The invention belongs to the field of piezoelectric ceramics. Specifically, the invention relates to a pyroelectric material and a preparation method thereof, in particular to a low dielectric constant, low loss, high pyroelectric coefficient, high detection rate and excellent Pyroelectric materials with high mechanical strength are mainly used in the preparation of pyroelectric devices such as high-sensitivity passive pyroelectric infrared sensors. Background technique [0002] Pyroelectric infrared sensor is a sensor that can detect infrared rays emitted by people or animals and output electrical signals. As early as 1938, someone proposed to use the pyroelectric effect to detect infrared radiation, but it was not taken seriously. It was not until the 1960s, with the rapid development of laser and infrared technology, that the research and development of pyroelectric effect was promoted. Application of pyroelectric crystals. Pyroelectric crystals h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/491C04B35/622
Inventor 白旭春孙福田张殿德李雪郑国恩付浩常吉华
Owner SENBA SENSING TECH CO LTD
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