High-Curie-temperature strontium-barium niobate pyroelectric ceramic material and preparation method thereof

A technology of pyroelectric ceramics and strontium barium niobate, applied in the field of preparation of strontium barium niobate pyroelectric ceramic materials, greatly improving the pyroelectric performance of materials, can solve problems such as poor pyroelectric performance, and achieve improved Effect of pyroelectric performance, high Curie temperature, and improved pyroelectric coefficient

Inactive Publication Date: 2017-02-01
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The present invention aims to overcome the technical problem of poor pyroelectric performance of existing high Curie temperature SBN ferroelectric ceramics, provides a preparation method for greatly improving the pyroelectric performance of SBN pyroelectric ceramic materials, and prepares a High T C SBN ceramics with excellent pyroelectric properties can replace lead-based materials to achieve the purpose of environmental protection

Method used

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  • High-Curie-temperature strontium-barium niobate pyroelectric ceramic material and preparation method thereof
  • High-Curie-temperature strontium-barium niobate pyroelectric ceramic material and preparation method thereof
  • High-Curie-temperature strontium-barium niobate pyroelectric ceramic material and preparation method thereof

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Embodiment 1

[0036] The difference between this embodiment and Comparative Example 1 is three points: 1. Sr 0.3 Ba 0.7 Nb 2 o 6 The green body is formed by cold isostatic pressing. ②The prepared Sr 0.3 Ba 0.7 Nb 2 o 6 The green body is placed in a graphite mold, with ZrO 2 Fill the green body with powder and completely cover the green body, raise the temperature to 1150°C at a rate of 1.5°C / min, start uniaxial linear pressure, continue to heat up to 1260°C at the same rate, and at the same time the pressure reaches 100MPa, heat preservation and pressure After 4 hours, finally release the pressure linearly at 10MPa / min and cool down to room temperature with the furnace cooling, and the whole sintering process is carried out under air atmosphere. ③The sintered samples were cut parallel to the hot pressing axis and perpendicular to the hot pressing axis, cleaned, dried, screen printed with silver paste, then dried, silver burned, polarized and tested for electrical properties. The re...

Embodiment 2

[0039] The only difference between this embodiment and embodiment 1 is that the maximum pressure is increased to 200MPa. The rest of the content of this embodiment is the same as that described in Embodiment 1.

[0040] Thin the thickness of the prepared pyroelectric ceramic sample to 0.5 mm, use gasoline, detergent, absolute ethanol, and deionized water to ultrasonically clean it for 15 minutes, and then print silver paste with screen after drying. After sintering for 30 minutes, ceramic samples were made to measure their electrical properties. The polarization treatment conditions of ceramic samples are as follows: put the obtained ceramic samples in silicone oil, apply a DC electric field of 7kV / mm to the ceramic samples when heating the silicone oil to 210°C, keep the electric field at 7kV / mm for 60min, and then keep the electric field strength unchanged Cool down to 40°C naturally, remove the electric field and take out the ceramic samples. Finally, the intrinsic pyroel...

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Abstract

The invention relates to a high-Curie-temperature strontium-barium niobate pyroelectric ceramic material and a preparation method thereof. The material has the composition general formula of SrxBa1-xNb2O6, wherein x is larger than or equal to 0.25 and smaller than or equal to 0.35. The SBN ceramic material high in density and pyroelectric performance is obtained by preparing power through a solid phase method, preparing an SBN blank through cold isostatic pressing forming and other processes, putting the SBN blank in a mold, filling and covering the SBN blank with ZrO2 powder, raising the temperature to 1100-1150 DEG C, linearly and evenly pressurizing to 100-200 MPa with the axis of the mold as the hot-press axis, raising the temperature to 1200-1300 DEG C, keeping the temperature and the pressure for 2-4 h in the air atmosphere, and linearly depressurizing and cooling inside a furnace to the room temperature. The problem that high-Curie-temperature SBN components are poor in pyroelectric performance is solved.

Description

technical field [0001] The invention belongs to the field of infrared detection materials, and in particular relates to a barium strontium niobate pyroelectric ceramic material and a preparation method for greatly improving the pyroelectric performance of the material. Background technique [0002] Pyroelectric uncooled infrared detection technology has the characteristics of no refrigeration, wide response spectrum, fast response speed, low cost, etc., and has become one of the most attractive technologies in the current infrared detection technology. Ferroelectric ceramics with pyroelectric properties (also known as pyroelectric ceramics) are one of the key sensitive element materials for uncooled infrared detection technology, and their working modes can be divided into intrinsic pyroelectric mode and dielectric-pyroelectric model. The intrinsic pyroelectric mode mainly utilizes the variation of spontaneous polarization with temperature, due to the Curie temperature (T ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622
CPCC04B35/495C04B35/622C04B2235/3213C04B2235/3215C04B2235/96
Inventor 王根水陈慧郭少波姚春华曹菲董显林
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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