Iron-doped perovskite type negative temperature coefficient thermal sensitive ceramic material and preparation thereof

A negative temperature coefficient, perovskite-type technology is applied in the field of preparing iron-doped perovskite-type negative temperature coefficient thermal ceramic materials, which can solve the problems of lack of high precision and low B, and achieve application field expansion and dispersibility. Good, good porcelain effect

Active 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

[0003] Aiming at the current lack of high-precision, high-resistance, low-B thermally sensitive ceramic materials against the trend, the present invention provides an iron-doped perovskite type negative temperature coefficient thermally sensitive ceramic material

Method used

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  • Iron-doped perovskite type negative temperature coefficient thermal sensitive ceramic material and preparation thereof
  • Iron-doped perovskite type negative temperature coefficient thermal sensitive ceramic material and preparation thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] (1) First use La 2 o 3 、Cr 2 o 3 , Fe 2 o 3 As raw material, according to the perovskite phase (LaCrFe) 2 o 3 The atomic percentage in the middle is La:Cr:Fe=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 12 hours, and control the content 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;

[0029] (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;

[0030] (3) Calcining the powder obtained in step (2) at 1000°C for 2 hours to obtain the perovskite phase (LaCrFe) in step a 2 o 3 Powder, the particle size of the powder is 0.154 μm; then it is placed in an agate mortar and ground fo...

Embodiment 2

[0035] (1) First use La 2 o 3 、Cr 2 o 3 , Fe 2 o 3 As raw material, according to the perovskite phase (LaCrFe) 2 o 3The atomic percentage in the middle is La:Cr:Fe=50:40:10 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 8 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;

[0036] (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;

[0037] (3) Calcining the powder obtained in step (2) at 1100°C for 2 hours to obtain the perovskite phase (LaCrFe) in step a 2 o 3 Powder, the particle size of the powder is 1.534 μm; then it is placed in an agate mortar and ground for 4 hou...

Embodiment 3

[0042] (1) First use La 2 o 3 、Cr 2 o 3 , Fe 2 o 3 As raw material, according to the perovskite phase (LaCrFe) 2 o 3 The atomic percentage in the middle is La:Cr:Fe=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 6 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;

[0043] (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;

[0044] (3) Calcining the powder obtained in step (2) at 1000°C for 2 hours to obtain the perovskite phase (LaCrFe) in step a 2 o 3 Powder, the particle size of the powder is 1.776 μm; then it is placed in an agate mortar and ground for 4 ho...

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Abstract

The invention provides a preparation method of an iron-doped perovskite type negative temperature coefficient thermal sensitive ceramic material. The method comprises the following steps: weighing rawmaterials according to a La-Cr-Fe atomic percent of 30-55 to 10-65 to 5-35), and performing wet grinding to obtain slurry; drying the slurry, and grinding to obtain a powder; calcining to obtain a perovskite phase (LaCrFe)2O3 powder; preparing a bulk material from the powder, adopting a two-step sintering method, and performing furnace cooling, so as to obtain the iron-doped perovskite type negative temperature coefficient thermal sensitive ceramic material. According to the preparation method disclosed by the invention, the two-step sintering method is adopted, grain boundary diffusion is positioned in an active state while inhibiting grain boundary migration, and the aim of completing sintering on premise of not growing grains is achieved; the finally prepared ceramic material is smallin grain size, uniform in distribution, high in resistance, wide in adjustable range, small in value B change, high in stability and excellent in consistency.

Description

technical field [0001] The invention relates to an iron-doped perovskite type negative temperature coefficient heat-sensitive ceramic material prepared 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 prominent. When the resistivity of the material is high, its B value is also high, and vice versa. At the same time, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/64C04B35/626
CPCC04B35/50C04B35/6261C04B35/64C04B2235/3241C04B2235/3272C04B2235/6562C04B2235/661C04B2235/768C04B2235/785C04B2235/786
Inventor 程新关芳黄世峰林秀娟戴晗
Owner UNIV OF JINAN
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