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An in-situ-generated layered composite negative temperature coefficient thermosensitive ceramic material and its preparation method and application

A negative temperature coefficient, layered composite technology, applied in chemical instruments and methods, ceramic layered products, layered products, etc., can solve the problems of high B value, difficult to obtain, low resistance value, etc., and achieve high B value. , The layer thickness is highly controllable and the effect of reducing the resistance value

Active Publication Date: 2021-11-16
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to obtain NTC thermistors with low resistance and high B value through a single spinel structure material to meet the requirements of NTC thermistors for suppressing surge currents

Method used

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  • An in-situ-generated layered composite negative temperature coefficient thermosensitive ceramic material and its preparation method and application
  • An in-situ-generated layered composite negative temperature coefficient thermosensitive ceramic material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A method for in-situ generation of a layered composite negative temperature coefficient heat-sensitive ceramic material, comprising the steps of:

[0057] (1) Powder preparation:

[0058] Analytical pure La 2 o 3 、Cr 2 o 3 As raw material, according to LaCrO 3 Molar ratio of middle atoms, weighed La 2 o 3 、Cr 2 o 3 , be placed in the agate ball mill jar, take the agate ball as the ball mill medium, deionized water as the dispersion medium, control the mass ratio of each substance in the ball mill jar to be: agate ball: raw material: deionized water=3:1:1, ball mill is smooth Alternate wet milling for 36 hours counterclockwise, with an interval of 1 hour counterclockwise, then dry at 80°C for 24 hours, and grind for 3.5 hours after completion to obtain the first powder for later use;

[0059] To analyze pure MgO, Al 2 o 3 As raw material, according to MgAl 2 o 4 Molar ratio of middle atoms, weigh MgO, Al 2 o 3 , placed in the agate ball mill jar, with the ...

Embodiment 2

[0070] A method for in-situ generation of a layered composite negative temperature coefficient heat-sensitive ceramic material, comprising the steps of:

[0071] (1) Powder preparation:

[0072] Analytical pure La 2 o 3 , MnO 2 , Fe 2 o 3 As raw material, according to LaMn 0.5 Fe 0.5 o 3 Molar ratio of middle atoms, weighed La 2 o 3 , MnO 2 , Fe 2 o 3Place in the agate ball milling jar, take the agate ball as the ball milling medium, and deionized water as the dispersion medium, control the mass ratio of each substance in the ball milling jar to be: agate ball: raw material: deionized water=3:1:1, and the ball milling is forward and reverse Alternate wet milling in the clockwise direction for 24 hours, clockwise and counterclockwise at intervals of 1 hour, then dry at 80°C for 24 hours, and grind for 3.5 hours after completion to obtain the first powder for later use;

[0073] To analyze pure MnO 2 、Ni 2 o 3 , Fe 2 o 3 As raw material, according to NiMn 1.8 ...

Embodiment 3

[0083] A method for in-situ generation of a layered composite negative temperature coefficient heat-sensitive ceramic material, comprising the steps of:

[0084] (1) Powder preparation:

[0085] Analytical pure La 2 o 3 , MnO 2 , CaO as raw material, according to LaMn 0.8 Ca 0.2 o 3 Molar ratio of middle atoms, weighed La 2 o 3 , MnO 2 , placed in the agate ball mill jar, with the agate ball as the ball mill medium, deionized water as the dispersion medium, the mass ratio of each substance in the control ball mill jar is: agate ball: raw material: deionized water=3:1:1, ball mill is smooth Alternate wet grinding for 30 hours counterclockwise, 1 hour interval clockwise, and then dry at 70°C for 24 hours. After completion, grind for 3.5 hours to obtain the first powder and set aside;

[0086] To analyze pure MnO 2 、Ni 2 o 3 As raw material, according to Ni 0.4 mn 2.6 o 4 Molar ratio of middle atoms, weighed MnO 2 、Ni 2 o 3 , placed in the agate ball mill jar, w...

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Abstract

The invention belongs to the technical field of negative temperature coefficient thermistors, and in particular relates to an in-situ-generated layered composite negative temperature coefficient thermosensitive ceramic material, a preparation method and an application thereof. The structure of the heat-sensitive ceramic material is a base layer, a transition layer, and a sensitive layer in sequence, wherein: the base layer is composed of a perovskite phase or a doped perovskite phase, and the sensitive layer is composed of a sharp Crystal phase or doped spinel phase, the composition of the transition layer is: perovskite phase or doped perovskite phase and spinel phase or doped spinel mixed in equal volumes mixture. Introducing the cold spraying technology into the preparation of layered structure composite heat-sensitive ceramics, the in-situ generation of layered composite negative temperature coefficient heat-sensitive ceramic materials was prepared, which overcomes the shortcomings of traditional methods and realizes the sensitivity to the thickness of the sensitive layer and the microstructure of the material. The effective control of NTC is of great significance for the preparation of NTC thermosensitive ceramic materials with low resistance, high B value and high stability for suppressing surge current.

Description

technical field [0001] The invention belongs to the technical field of negative temperature coefficient thermistors, and in particular relates to an in-situ-generated layered composite negative temperature coefficient thermosensitive ceramic material, a preparation method and an application thereof. Background technique [0002] The information disclosed in the Background of the Invention is only intended to increase the understanding of the general background of the invention, and is not necessarily to be taken as an acknowledgment or any form of suggestion that the information constitutes the prior art that is already known to those skilled in the art. [0003] Negative temperature coefficient (NTC) thermistors are resistors whose resistance decreases as temperature increases. NTC thermistors are widely used in temperature measurement, temperature control, temperature compensation, and surge current suppression due to their advantages of high sensitivity, high temperature ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B18/00C04B35/10C04B35/50C04B35/622
Inventor 程新关芳黄世峰党则伟芦令超
Owner UNIV OF JINAN
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