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Preparation method of composite phase negative temperature coefficient thermal sensitive ceramic material

A technology of negative temperature coefficient and heat-sensitive ceramics, which is applied in the field of preparing composite phase negative temperature coefficient heat-sensitive powders and ceramic materials, can solve the problems that restrict the wide application of NTC heat-sensitive elements, change the electrical properties of materials, and poor stability, and achieve Good porcelain forming property, small particle size and high stability

Active Publication Date: 2011-10-12
中科传感(佛山)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the resistivity of the material is high, its B value is also high, and vice versa. At the same time, the stability of the multi-element ceramic material composed of spinel structure is poor, and the sintered ceramic is in a non-equilibrium state, resulting in a change in the electrical properties of the material. These two points restrict the wide application of NTC thermal elements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] a, first with La 2 o 3 , CaO, MnO 2 、Ni 2 o 3 As raw materials, according to the atomic percentage of the perovskite phase LaCaMnO is La: Ca: Mn = 30: 5: 65 and the atomic percentage of the spinel phase NiMnO is Ni: Mn = 30: 70, respectively weighed and placed in an agate ball mill jar , using water as the dispersion medium, carry out wet milling, time 8h, control the mass ratio of each substance in the ball mill tank: agate ball: material: deionized water = 2.5: 1: 1, the ball mill is carried out alternately in the clockwise direction, forward and reverse Hour hand interval time 30min;

[0021] b. Dry the wet-milled material in step a at a temperature of 80° C., and grind for 1 hour to obtain a powder;

[0022] c. Pre-fire the powder obtained in step b at a temperature of 900° C. for 2 hours to obtain the powders of perovskite phase LaCaMnO and spinel phase NiMnO in step a respectively. The particle size of the perovskite phase LaCaMnO powder is 0.214-1.643μm, th...

Embodiment 2

[0027] a, first with La 2 o 3 , CaO, MnO 2 、Ni 2 o 3 As raw materials, according to the atomic percentage of the perovskite phase LaCaMnO is La: Ca: Mn = 40: 10: 50 and the atomic percentage of the spinel phase NiMnO is Ni: Mn = 35: 65, respectively weighed and placed in an agate ball mill jar , using water as the dispersion medium, carry out wet milling, time 8h, control the mass ratio of each substance in the ball mill tank: agate ball: material: deionized water = 2.5: 1: 1, the ball mill is carried out alternately in the clockwise direction, forward and reverse Hour hand interval time 30min;

[0028] b. Dry the wet-milled material in step a at a temperature of 80° C., and grind for 1 hour to obtain a powder;

[0029] c. Pre-calcine the powder obtained in step b at a temperature of 1000°C for 2 hours to obtain the perovskite phase LaCaMnO particle size of 0.163-1.625 μm and the spinel phase NiMnO particle size of 0.325-1.349 μm in step a respectively of powder;

[003...

Embodiment 3

[0034] a, first with La 2 o 3 , CaO, MnO 2 、Ni 2 o 3 As raw materials, according to the atomic percentage of the perovskite phase LaCaMnO is La: Ca: Mn = 45: 20: 35 and the atomic percentage of the spinel phase NiMnO is Ni: Mn = 40: 60, respectively weighed and placed in an agate ball mill jar , using water as the dispersion medium, carry out wet milling, time 8h, control the mass ratio of each substance in the ball mill tank: agate ball: material: deionized water = 2.5: 1: 1, the ball mill is carried out alternately in the clockwise direction, forward and reverse Hour hand interval time 30min;

[0035] b. Dry the wet-milled material in step a at a temperature of 80° C., and grind for 1 hour to obtain a powder;

[0036] c. Pre-calcine the powder obtained in step b at a temperature of 1100°C for 2 hours to obtain the perovskite phase LaCaMnO particle size of 0.271-1.736 μm and the spinel phase NiMnO particle size of 0.587-1.642 μm in step a respectively of powder;

[003...

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Abstract

The invention relates to a preparation method of a composite phase negative temperature coefficient thermal sensitive ceramic material. In the method, based on La2O3, CaO, MnO2 and Ni2O3 are used as raw materials, perovskite phase LaCaMnO and spinel phase NiMnO powders are prepared by using an oxide solid phase method; drying, calcination, two-phase mixing and grinding, press molding and sintering are carried out on the powders; and then the ceramic material is prepared. The parameters of the composite phase negative temperature coefficient thermal sensitive ceramic material obtained by the method are as follows: B25 / 50 is (2600K-2962K)+ / -1.5%, and R 25 DEG C is (0.225omega-47omega)+ / -2%; and the composite phase negative temperature coefficient thermal sensitive ceramic material has the characteristics of high value B, low resistance, good consistency, high stability and repeatability, is suitable for inhibition of surge current and measurement, control and line compensation of temperature at low temperature.

Description

technical field [0001] The invention relates to a composite phase negative temperature coefficient thermosensitive powder and 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 technology and demand, the limitations of this type of material are becoming increasingly prominent. When the resistivity of the material is high, its B value is also high, and vice versa. At the same time, the stability...

Claims

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Application Information

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IPC IPC(8): C04B35/01C04B35/622
Inventor 张惠敏关芳常爱民赵鹏君
Owner 中科传感(佛山)科技有限公司
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