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Low-temperature-sintered BiFeO3-based high-performance negative-temperature-coefficient thermosensitive ceramic material and preparation method thereof

A negative temperature coefficient, heat-sensitive ceramic technology, applied in the field of electronic information functional materials, can solve problems such as hindering application, and achieve the effects of high practicability, high promotion and application prospects, and low sintering temperature

Inactive Publication Date: 2013-03-13
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its large leakage current feature hinders its further application in the fields of ferroelectric and piezoelectric, but this feature is of great value for the research of thermosensitive materials

Method used

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  • Low-temperature-sintered BiFeO3-based high-performance negative-temperature-coefficient thermosensitive ceramic material and preparation method thereof
  • Low-temperature-sintered BiFeO3-based high-performance negative-temperature-coefficient thermosensitive ceramic material and preparation method thereof
  • Low-temperature-sintered BiFeO3-based high-performance negative-temperature-coefficient thermosensitive ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] with BaCO 3 、 Bi 2 o 3 , Fe 2 o 3 and TiO 2 As raw material, according to the chemical formula 0.9BiFeO 3 -0.1BaTiO 3 Proportioning, wet ball milling with anhydrous ethanol as the medium, after drying, synthesize 0.9BiFeO at 750°C for 2 hours 3 -0.1BaTiO 3 Solid solution powder, the obtained solid solution powder is carried out secondary ball milling and sieving, and then in the obtained 0.9BiFeO 3 -0.1BaTiO 3 Add a certain amount of polyvinyl alcohol (PVA) with a mass concentration of 5% to the solid solution powder, mix it evenly, dry it, and then press it into a disc-shaped green body on a molding machine, and put the obtained disc-shaped green body at 905°C Heat preservation for 4 hours and sinter into thermosensitive ceramics. The resulting 0.9BiFeO 3 -0.1BaTiO 3 Thermally sensitive ceramics are polished on both sides and then tested for resistivity-temperature relationship and aging performance.

[0020] The performance test shows that the thermosensi...

Embodiment 2

[0022] SrCO 3 、 Bi 2 o 3 , Fe 2 o 3 and TiO 2 As raw material, according to the chemical formula 0.8BiFeO 3 -0.2SrTiO 3 Proportioning, wet ball milling with anhydrous ethanol as the medium, after drying, synthesize 0.8BiFeO at 750°C for 4 hours 3 -0.2SrTiO 3 Solid solution powder, the obtained solid solution powder is carried out secondary ball milling and sieving, and then in the obtained 0.8BiFeO 3 -0.2SrTiO 3 Add a certain amount of polyvinyl alcohol (PVA) with a mass concentration of 5% to the solid solution powder, mix it evenly, dry it, and then press it into a disc-shaped green body on a molding machine, and put the obtained disc-shaped green body at 935°C Heat preservation for 4 hours and sinter into thermosensitive ceramics. The resulting 0.8BiFeO 3 -0.2SrTiO 3 Thermally sensitive ceramics are polished on both sides and then tested for resistivity-temperature relationship and aging performance.

[0023] The performance test shows that the thermosensitive ...

Embodiment 3

[0025] with BaCO 3 、 Bi 2 o 3 , Sb 2 o 3 , Fe 2 o 3 and SnO 2 As raw material, according to the chemical formula 0.95BiFeO 3 -0.05BaSb 0.04 sn 0.96 o 3Proportioning, wet ball milling with anhydrous ethanol as the medium, after drying, synthesize 0.95BiFeO at 780°C for 2 hours 3 -0.05BaSb 0.04 sn 0.96 o 3 Solid solution powder, the obtained solid solution powder is carried out secondary ball milling and sieving, and then in the obtained 0.95BiFeO 3 -0.05BaSb 0.04 sn 0.96 o 3 Add a certain amount of polyvinyl alcohol (PVA) with a mass concentration of 5% to the solid solution powder, mix it evenly, dry it, and then press it into a disc-shaped green body on a molding machine, and put the obtained disc-shaped green body at 925°C Heat preservation for 2 hours and sinter into heat-sensitive ceramics. The resulting 0.95BiFeO 3 -0.05BaSb 0.04 sn 0.96 o 3 Thermally sensitive ceramics are polished on both sides and then tested for resistivity-temperature relationsh...

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Abstract

The invention discloses a low-temperature-sintered BiFeO3-based high-performance negative-temperature-coefficient thermosensitive ceramic material and a preparation method thereof. According to the preparation method, (1-x)BiFeO3-xMeMO3 powder is firstly synthesized, no SiO2 or a small amount of SiO2 is doped, and the SiO2-doped (1-x)BiFeO3-xMeMO3 thermosensitive ceramic material is formed through compression molding and sintering. According to the low-temperature-sintered BiFeO3-based high-performance negative-temperature-coefficient thermosensitive ceramic material prepared by the preparation method, the sintering temperature is lower than 95 DEG C, the performance is stable, and shown by property tests, the following better comprehensive thermosensitive properties can be obtained: the thermosensitive constant beta25 / 85 is higher than 5,000 K, the room-temperature resistivity rho25 is lower than 1,000,000 ohm.cm, and the aging rate eta is lower than 5%. According to the preparation method, a traditional ceramic solid phase sintering preparation process is adopted, and the adopted process is relatively simple and stable, so that the preparation method has higher practicality and popularization and application prospects.

Description

technical field [0001] The invention relates to a low-temperature sinterable BiFeO 3 The invention relates to a perovskite-based high-performance negative temperature coefficient heat-sensitive ceramic material, which belongs to the technical field of electronic information functional materials. Background technique [0002] Thermistor is a kind of electronic information functional material widely used. It shows that the resistivity of the material decreases linearly with the increase of ambient temperature. It has the functions of temperature compensation, temperature measurement and suppression of surge current. It is mainly used in water heaters, etc. , air conditioners, office supplies and automotive electronic control, etc. In the research on the existing negative temperature coefficient thermosensitive (referred to as "NTC") materials, it mainly focuses on spinel materials composed of transition metal oxides, such as Co, Mn, Ni, Cu, Fe, Al, Cr, etc. Semiconductor NTC...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 袁昌来冯琴刘心宇陈国华洛颖周昌荣
Owner GUILIN UNIV OF ELECTRONIC TECH
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