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In-situ-generated layered composite negative-temperature-coefficient thermal-sensitive ceramic material, preparation method and application

A technology of negative temperature coefficient, heat-sensitive ceramics, applied in the field of in-situ generation of layered composite negative temperature coefficient heat-sensitive ceramic materials and preparation, can solve the problems of high B value, low resistance value, difficult to obtain, etc. Small, low resistance, highly controllable layer thickness

Active Publication Date: 2019-06-28
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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  • In-situ-generated layered composite negative-temperature-coefficient thermal-sensitive ceramic material, preparation method and application
  • In-situ-generated layered composite negative-temperature-coefficient thermal-sensitive ceramic material, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A method for in-situ generation of layered composite negative temperature coefficient thermal ceramic material includes the following steps:

[0057] (1) Powder preparation:

[0058] To analyze pure La 2 O 3 , Cr 2 O 3 As raw material, press LaCrO 3 The molar ratio of middle atoms, weighing La 2 O 3 , Cr 2 O 3 、Placed in an agate ball milling tank, using agate balls as the ball milling medium and deionized water as the dispersion medium to control the mass ratio of each substance in the ball milling tank as follows: agate ball: raw material: deionized water = 3:1:1, ball milling is smooth Wet-grind alternately counterclockwise for 36h, clockwise for 1h, then dry at 80℃ for 24h, after grinding for 3.5h, get the first powder for use;

[0059] To analyze pure MgO, Al 2 O 3 As raw material, press MgAl 2 O 4 The molar ratio of middle atoms, weighing MgO, Al 2 O 3 , Placed in an agate ball milling tank, using agate balls as the ball milling medium and deionized water as the dispersi...

Embodiment 2

[0070] A method for in-situ generation of layered composite negative temperature coefficient thermal ceramic material includes the following steps:

[0071] (1) Powder preparation:

[0072] To analyze pure La 2 O 3 , MnO 2 , Fe 2 O 3 As raw material, press LaMn 0.5 Fe 0.5 O 3 The molar ratio of middle atoms, weighing La 2 O 3 , MnO 2 , Fe 2 O 3 Placed in an agate ball milling tank, using agate balls as the ball milling medium and deionized water as the dispersing medium to control the mass ratio of each substance in the ball milling tank as follows: agate ball: raw material: deionized water = 3:1:1, ball milling is forward and backward Wet-grind alternately in the clockwise direction for 24 hours, clockwise for an interval 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 use;

[0073] To analyze pure MnO 2 , Ni 2 O 3 , Fe 2 O 3 As raw material, press NiMn 1.8 Fe 0.2 O 4 The molar ratio of the middle atom, weighing MnO 2...

Embodiment 3

[0083] A method for in-situ generation of layered composite negative temperature coefficient thermal ceramic material includes the following steps:

[0084] (1) Powder preparation:

[0085] To analyze pure La 2 O 3 , MnO 2 , CaO as raw material, according to LaMn 0.8 Ca 0.2 O 3 The molar ratio of middle atoms, weighing La 2 O 3 , MnO 2 , Placed in an agate ball milling tank, using agate balls as the ball milling medium and deionized water as the dispersion medium to control the mass ratio of each substance in the ball milling tank as follows: agate ball: raw material: deionized water = 3:1:1, and the ball mill is smooth Wet-grind alternately counterclockwise for 30h, clockwise for 1h, then dry at 70°C for 24h, and grind for 3.5h after completion to obtain the first powder for use;

[0086] To analyze pure MnO 2 , Ni 2 O 3 As raw material, press Ni 0.4 Mn 2.6 O 4 The molar ratio of the middle atom, weighing MnO 2 , Ni 2 O 3 , Placed in an agate ball milling tank, using agate balls as ...

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Abstract

The invention belongs to the technical field of negative-temperature-coefficient thermistors and particularly relates to an in-situ-generated layered composite negative-temperature-coefficient thermal-sensitive ceramic material, a preparation method and application. The thermal-sensitive ceramic material structurally comprises a base layer, a transition layer and a sensitive layer in sequence. Thecomposition of the base layer is a perovskite phase or a doped perovskite phase, the composition of the sensitive layer is a spinel phase or a doped spinel phase, and the composition of the transition layer is a mixture formed by mixing the perovskite phase or the doped perovskite phase with the spinel phase or the doped spinel phase in an isopyknic mode. A cold spraying technology is introducedinto preparation of layered-structure composite thermal-sensitive ceramics, the in-situ-generated layered composite negative-temperature-coefficient thermal-sensitive ceramic material is prepared, thedefect of a traditional method is overcome, the thickness of the sensitive layer and the microstructure of the material are effectively regulated and controlled, and the material has important significance on preparation of low-resistance-value, high-B-value and high-stability NTC thermal-sensitive ceramic materials for inhibiting the surge current.

Description

Technical field [0001] The invention belongs to the technical field of negative temperature coefficient thermistors, and particularly relates to an in-situ generated layered composite negative temperature coefficient thermistor ceramic material and a preparation method and application. Background technique [0002] The information disclosed in the background of the present invention is only intended to increase the understanding of the general background of the present invention, and is not necessarily regarded as an acknowledgement or in any form implying that the information constitutes the prior art known to those of ordinary skill in the art. [0003] Negative temperature coefficient (NTC) thermistor refers to a resistance whose resistance value decreases with increasing temperature. NTC thermistors are widely used in temperature measurement, temperature control, temperature compensation and surge current suppression due to their high sensitivity, high temperature measurement a...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/50C04B35/622
Inventor 程新关芳黄世峰党则伟芦令超
Owner UNIV OF JINAN
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