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Axial composite negative temperature coefficient thermosensitive ceramic material and preparation method thereof

A negative temperature coefficient, thermal ceramic technology, applied in the field of axial composite negative temperature coefficient thermistor ceramic material and its preparation, can solve the problems of lack of high B value, low resistivity, etc., and achieve high electrical stability, electrical The effect of stable performance and high thermal expansion matching

Active Publication Date: 2018-08-24
UNIV OF JINAN
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the lack of NTC materials and preparation methods with high B value, low resistivity and high stability at present, the present invention provides a preparation method of axial composite negative temperature coefficient thermosensitive ceramic material, which can effectively reduce the material resistance and Small change in B value, high material stability

Method used

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  • Axial composite negative temperature coefficient thermosensitive ceramic material and preparation method thereof
  • Axial composite negative temperature coefficient thermosensitive ceramic material and preparation method thereof
  • Axial composite negative temperature coefficient thermosensitive ceramic material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0035] (1) First, analyze pure Ni 2 o 3 , MnO2 , La 2 o 3 、Cr 2 o 3 , Fe 2 o 3 As raw material, according to the spinel phase NiMn 2 o 4 and perovskite phase LaCr 0.7 Fe 0.3 o 3 Neutral atom mol ratio, take each oxide by weighing respectively and place in the agate ball mill jar, take the agate ball as the ball mill medium, dehydrated alcohol as the dispersion medium, wet mill 15h, control each material mass ratio in the ball mill jar to be: agate ball: raw material: Anhydrous ethanol=2.5:1:1, the ball milling is carried out alternately clockwise and counterclockwise, with an interval of 30 minutes clockwise and counterclockwise, and two kinds of slurries are obtained;

[0036] (2) Dry the slurry in step (1) at 80°C respectively, and then grind for 1 hour to obtain two kinds of powders;

[0037] (3) Calcining the two powders of the spinel component and the perovskite component in step (2) at 900°C and 1000°C, respectively, to obtain the spinel phase NiMn 2 o 4 an...

Embodiment 2

[0043] (1) First, analyze pure Ni 2 o 3 , MnO 2 , La 2 o 3 、Cr 2 o 3 , Fe 2 o 3 As raw material, according to the spinel phase NiMn 2 o 4 and perovskite phase LaCr 0.7 Fe 0.3 o 3 Neutral atom molar ratio, take each oxide by weighing respectively and place in the agate ball milling tank, take the agate ball as the ball milling medium, dehydrated alcohol as the dispersion medium, wet mill 24h, control each material mass ratio in the ball milling tank to be: agate ball: material: Anhydrous ethanol=2.5:1:1, the ball milling is carried out alternately clockwise and counterclockwise, with an interval of 30 minutes clockwise and counterclockwise, and two kinds of slurries are obtained;

[0044] (2) Dry the slurry in step (1) at 80°C respectively, and then grind for 1 hour to obtain two kinds of powders;

[0045] (3) Calcining the two powders of the spinel component and the perovskite component in step (2) at 900°C and 1000°C, respectively, to obtain the spinel phase NiMn...

Embodiment 3

[0050] (1) First, analyze pure Ni 2 o 3 , MnO 2 , La 2 o 3 、Cr 2 o 3 , Fe 2 o 3 As raw material, according to the spinel phase NiMn 2 o 4 and perovskite phase LaCr 0.7 Fe 0.3 o 3 Neutral atom molar ratio, take each oxide by weighing respectively and place in the agate ball milling tank, take the agate ball as the ball milling medium, dehydrated alcohol as the dispersion medium, wet mill 18h, control each material mass ratio in the ball milling tank to be: agate ball: material: Anhydrous ethanol=2.5:1:1, the ball milling is carried out alternately clockwise and counterclockwise, with an interval of 30 minutes clockwise and counterclockwise, and two kinds of slurries are obtained;

[0051] (2) Dry the slurry in step (1) at 80°C respectively, and then grind for 1 hour to obtain two kinds of powders;

[0052] (3) Calcining the two powders of the spinel component and the perovskite component in step (2) at 900°C and 1000°C, respectively, to obtain the spinel phase NiMn...

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Abstract

The invention provides an axial composite negative temperature coefficient thermosensitive ceramic material. The axial composite negative temperature coefficient thermosensitive ceramic material is formed by compounding of two phase materials, one phase is perovskite phase or doped perovskite phase, and the other phase is spinel phase or doped spinel phase, and the interface of the two phases is atransition interlayer formed by uniform mixing of two-phase powder. The spinel phase or doped spinel phase and the perovskite phase or doped perovskite phase are in a volume ratio of 1:9-9:1. The molecular formula of a spinel phase oxide is AxB2-xO4, wherein A is one or more of Al, Ni, Co and Fe, and B is one or more of Mn, Mg and Ti, x is greater than or equal to 0.4 and smaller than or equal to1.5; and the molecular formula of a perovskite phase oxide is LaCr1-yByO3, wherein B is one or more of Fe, Co and Mn, and y is greater than or equal to 0 and less than or equal to 0.8. The axial composite negative temperature coefficient thermosensitive ceramic material provided by the invention is formed by compounding of the two phase materials, has the resistance value variation in line with the parallel resistance variation rule, the measured resistance value is basically consistent with the theoretical calculated value. The axial composite negative temperature coefficient thermosensitiveceramic material can effectively lower the resistance value, and has small B value variation and high stability.

Description

technical field [0001] The invention relates to the technical field of negative temperature coefficient thermistors, in particular to an axial composite negative temperature coefficient thermistor ceramic material and a preparation method thereof. Background technique [0002] Negative temperature coefficient (NTC) thermistors are resistors whose resistance decreases as temperature increases. NTC thermistor ceramic materials are widely used in temperature measurement, temperature control, temperature compensation and suppression of surge current due to their advantages of high sensitivity, high temperature measurement accuracy, good interchangeability, and low price. Development potential of electronic components. With the development of technology and demand, the market demand for NTC temperature sensors is increasing day by day. The main parameters of NTC thermosensitive ceramic materials include: (1) ρ 25℃ , refers to the resistivity at 25°C; (2) Material constant B, a...

Claims

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Application Information

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IPC IPC(8): C04B35/50C04B35/01
CPCC04B35/01C04B35/50C04B2235/3227C04B2235/3241C04B2235/3267C04B2235/3272C04B2235/3279C04B2235/96
Inventor 关芳黄世峰林秀娟戴晗程新
Owner UNIV OF JINAN
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