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Chromium and manganese co-doped perovskite type negative temperature coefficient heat-sensitive ceramic material

A negative temperature coefficient, perovskite type technology, applied in the direction of resistors with negative temperature coefficient, non-adjustable metal resistors, resistors, etc., can solve the problem of lack of high precision, achieve the suppression of grain boundary migration and expand the application The effect of uniform range and particle size

Inactive Publication Date: 2018-09-28
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the current lack of high-precision, high-resistance, low-B and low-resistance, high-B components, the present invention provides a chromium-manganese co-occupying perovskite-type negative temperature coefficient thermosensitive ceramic material with adjustable electrical parameters. Good stability and consistency

Method used

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  • Chromium and manganese co-doped perovskite type negative temperature coefficient heat-sensitive ceramic material
  • Chromium and manganese co-doped perovskite type negative temperature coefficient heat-sensitive ceramic material

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) First use La 2 o 3 、Cr 2 o 3 , MnO 2 As raw material, according to the perovskite phase La(CrMn)O 3 The atomic percentage in the middle is La:Cr:Mn=50:45:5 Weigh each oxide and place it in an agate ball milling jar, use agate balls as the ball milling medium and absolute ethanol as the dispersion medium, wet mill for 15 hours, and control the amount of each substance in the ball milling jar The mass ratio is: agate ball: material: absolute ethanol = 2.5:1:1, ball milling is carried out alternately clockwise and counterclockwise, with an interval of 30 minutes clockwise and counterclockwise;

[0030] (2) Dry the wet-milled slurry in step (1) in a vacuum drying oven at 80°C, and then grind for 1 hour to obtain a powder;

[0031] (3) Calcining the powder obtained in step (2) at 950°C for 2 hours to obtain the perovskite phase La(CrMn)O in step a 3 Powder, the particle size of the powder is 0.746 μm; then it is placed in an agate mortar and ground for 4 hours to o...

Embodiment 2

[0036] (1) First use La 2 o 3 、Cr 2 o 3 , MnO 2 As raw material, according to the perovskite phase La(CrMn)O 3The atomic percentage in the middle is La:Cr:Mn=50:15:35. Weigh each oxide and place it in an agate ball mill jar. Use agate balls as the ball milling medium and absolute ethanol as the dispersion medium. Wet mill for 20 hours to control the amount of each substance in the ball mill jar. The mass ratio is: agate ball: material: absolute ethanol = 2.5:1:1, ball milling is carried out alternately clockwise and counterclockwise, with an interval of 30 minutes clockwise and counterclockwise;

[0037] (2) Dry the wet-milled slurry in step (1) in a vacuum drying oven at 80°C, and then grind for 1 hour to obtain a powder;

[0038] (3) Calcinate the powder obtained in step (2) at 1000°C for 2 hours to obtain the perovskite phase La(CrMn)O3 powder in step a, with a particle size of 0.417 μm; then place it on agate Grind in a mortar for 4 hours to obtain a powder material ...

Embodiment 3

[0043] (1) First use La 2 o 3 、Cr 2 o 3 , MnO 2 As raw material, according to the perovskite phase La(CrMn)O 3 The atomic percentage in the middle is La:Cr:Mn=50:35:15 Weigh each oxide and place it in an agate ball mill jar, use agate balls as the ball milling medium and absolute ethanol as the dispersion medium, wet mill for 24 hours, and control the content of each substance in the ball mill jar The mass ratio is: agate ball: material: absolute ethanol = 2.5:1:1, ball milling is carried out alternately clockwise and counterclockwise, with an interval of 30 minutes clockwise and counterclockwise;

[0044] (2) Dry the wet-milled slurry in step (1) in a vacuum oven at 100°C, and then grind for 1 hour to obtain a powder;

[0045] (3) Calcining the powder obtained in step (2) at 900°C for 2 hours to obtain the perovskite phase La(CrMn)O in step a 3 Powder, the particle size of the powder is 0.128 μm; then it is placed in an agate mortar and ground for 4 hours to obtain a po...

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Abstract

The invention provides a preparation method of a chromium and manganese co-doped perovskite type negative temperature coefficient heat-sensitive ceramic material. The method comprises the following step: weighing the following raw materials: 20-55% by atom of La, 5-75% by atom of Cr and 5-40% by atom of Mn; performing wet milling to obtain slurry; drying and grinding the slurry to obtain powder; roasting to obtain perovskite-phase La(CrMn)O3 powder; preparing the powder into block materials; performing two-step sintering method; cooling with the furnace to obtain the chromium and manganese co-doped perovskite type negative temperature coefficient heat-sensitive ceramic material. The chromium and manganese co-doped perovskite type negative temperature coefficient heat-sensitive ceramic material prepared according to the method has the advantages that electrical parameters are that rho25 DEG C=15.2 omega.cm-13823.2 ohm.cm+ / -2%, B25 / 50=2688-3942K+ / -1.5%; the material has the characteristics that the high-resistance, low-B and low-resistance and high-B parameter combination is realized; the consistency is high; the stability is high; the material is recyclable; the material is applicable to measuring and controlling of temperature in wide temperature range, circuit compensating and inhibiting of surge current.

Description

technical field [0001] The invention belongs to the field of novel heat-sensitive ceramic materials, and in particular relates to a method for preparing a chromium-manganese co-occupying perovskite type negative temperature coefficient heat-sensitive ceramic material by an oxide solid-phase method. Background technique [0002] Negative temperature coefficient (NTC) thermistor, because of its high temperature measurement accuracy, good interchangeability, high reliability, and low cost, has been widely used in temperature measurement, control, compensation, and remote control of communication equipment. It is widely used and is considered to be an electronic component with great development potential and has a good application prospect. Usually AB 2 o 4 The type spinel structure is the main crystal phase of NTC thermosensitive ceramic materials. With the development of science and technology and demand, the limitations of this type of material have become increasingly prom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/01C04B35/42C04B35/622C04B35/626C04B35/64H01C7/04
CPCC04B35/016C04B35/42C04B35/622C04B35/6261C04B35/64C04B2235/3227C04B2235/6562C04B2235/6565C04B2235/6567H01C7/043
Inventor 关芳黄世峰林秀娟戴晗程新
Owner UNIV OF JINAN
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