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Aluminium-doped perovskite phase negative temperature coefficient thermal sensitive ceramic material

A technology of negative temperature coefficient and perovskite phase is applied in the field of aluminum-doped perovskite phase negative temperature coefficient thermal ceramic materials, which can solve the limitation of the application field of NTC thermistor, the change of electrical properties, and the adjustable resistance value. big problem

Inactive Publication Date: 2013-05-29
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, it requires a large space for the adjustable resistance of the material to meet the needs of various environments; on the other hand, it requires the stability and consistency of the material to be better, and the multi-element ceramic material composed of spinel structure The stability is poor, and the material is in a non-equilibrium state after sintering, resulting in changes in electrical properties
The above two points seriously restrict the broad application fields of NTC thermistors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] a. Weigh La respectively according to the molar ratio of metal atoms La:Mn:Al=1:0.8:0.2 2 o 3 , MnO 2 and Al 2 o 3 Place in a ball mill tank, use an aqueous solution with a volume ratio of absolute ethanol: deionized water=1:1.3 as a ball mill medium, and wet mill for 8 hours to obtain a wet mill slurry;

[0019] b. Dry the wet-ground slurry in step a in a drying oven at a temperature of 85° C. for 30 hours, and grind for 2 hours a second time to obtain uniformly mixed fine powder with an average particle size of 2.43 μm;

[0020] c. Calcining the fine powder in step b at a temperature of 1000°C for 2 hours to obtain a single perovskite phase LaMn 0.8 Al 0.2 o 3 Powder, grind for 2 hours, the average particle size is 3.97um;

[0021] d. Al that will be doped 2 o 3 Grinding for 2h, the average particle size of the powder is 3.9um, and the single perovskite phase LaMn obtained in step c 0.8 Al 0.2 o 3 Powder by mass percentage LaMn 0.8 Al 0.2 o 3 : ...

Embodiment 2

[0025] a. Weigh La separately according to the molar ratio of metal atoms La:Mn=1:1 2 o 3 , MnO 2 Place in a ball mill tank, use an aqueous solution with a volume ratio of absolute ethanol: deionized water=1:1.2 as a ball mill medium, and wet mill for 8 hours to obtain a wet mill slurry;

[0026] b. Put the wet-milled slurry in step a in a drying oven at a temperature of 85° C. to dry for 30 hours, and grind for 2 hours to obtain a uniformly mixed fine powder with an average particle size of 2.4 μm;

[0027] c. Calcining the fine powder in step b at a temperature of 950°C for 2 hours to obtain a single perovskite phase LaMnO 3 Powder, grind for 2 hours, the average particle size is 4.03um;

[0028] d. Al that will be doped 2 o 3 Grinding for 2h, the average particle size of the powder is 3.8um, and the single perovskite phase LaMnO obtained in step c 3 Powder by mass percentage LaMnO 3 : Al 2 o 3 = 95:5 doping, grinding for 4h to get Al-doped LaMnO 3 Powder mater...

Embodiment 3

[0032] a. Weigh La respectively according to the molar ratio of metal atoms La:Mn:Al=1:0.6:0.4 2 o 3 , MnO 2 and Al 2 o 3 Place in a ball mill tank, use an aqueous solution with a volume ratio of absolute ethanol: deionized water=1:1.5 as a ball mill medium, and wet mill for 8 hours to obtain a wet mill slurry;

[0033] b. Dry the wet-ground slurry in step a in a drying oven at a temperature of 85° C. for 30 hours, and grind for 2 hours a second time to obtain a uniformly mixed fine powder with an average particle size of 2.5 μm;

[0034] c. Calcining the fine powder in step b at a temperature of 1050°C for 2 hours to obtain a single perovskite phase LaMn 0.6 Al 0.4 o 3 Powder, grind for 2 hours, the average particle size is 3.557um;

[0035] d. Al that will be doped 2 o 3 Grinding for 2h, the average particle size of the powder is 3.88um, and the single perovskite phase LaMn obtained in step c 0.6 Al 0.4 o 3 Powder by mass percentage LaMn 0.6 Al 0.4 o 3 ...

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Abstract

The invention relates to an aluminium-doped perovskite phase negative temperature coefficient thermal sensitive ceramic material. The aluminium-doped perovskite phase negative temperature coefficient thermal sensitive ceramic material is prepared from La2O3, MnO2 and Al2O3 by steps of preparing a perovskite phase LaMn1-xAlxO3 powder material by adopting an oxide solid-phase method, then doping Al2O3, forming and sintering at a high temperature. The electrical parameter range of the aluminium-doped perovskite phase negative temperature coefficient thermal sensitive ceramic material is B25 / 501817-3920K+ / 2%, rho25 DEG C 4.7-6.13*10<6>omega.cm+ / -3%. The aluminium-doped perovskite phase negative temperature coefficient thermal sensitive ceramic material has the advantages of wide adjustment range of electrical parameter and high repeatability. The aluminium-doped perovskite phase negative temperature coefficient thermal sensitive ceramic material is simple in a preparation technology and convenient to operate. The material formulation can be flexibly selected in a wide range according to the need. The aluminium-doped perovskite phase negative temperature coefficient thermal sensitive ceramic material is applied to thermistor elements for temperature measurement, control compensation and the like under different conditions.

Description

technical field [0001] The invention relates to an aluminum-doped perovskite phase negative temperature coefficient thermosensitive ceramic material. Background technique [0002] Negative temperature coefficient (NTC) thermistors are widely used in temperature measurement, control, compensation, and suppression of inrush current due to their high measurement sensitivity, good interchangeability, and high reliability. Traditional thermistors are made of spinel-structured MMn 2 o 4 Oxide composition, where M is transition metal elements such as Ni, Co, Fe, Cu, Zn. In general, such ceramic materials with a single spinel structure exhibit certain limitations. On the one hand, the aging phenomenon is obvious, so that its application is limited to a temperature of 300 ° C; on the other hand, its resistivity and thermal constant B The value is positively correlated, that is, when the resistivity is high, B value is also higher, and vice versa. The development of modern scien...

Claims

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Application Information

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IPC IPC(8): C04B35/44C04B35/50C04B35/622
Inventor 张惠敏赵丽君常爱民赵鹏君
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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