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Negative temperature coefficient thermosensitive resistor with high resistance and low B value

A technology of negative temperature coefficient and thermistors, applied in low B value negative temperature coefficient thermistors and high resistance fields, can solve the problems of poor stability, large consumption, change, etc., and achieve good consistency and stability , high reliability effect

Active Publication Date: 2012-09-05
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

Usually AB 2 o 4 The spinel structure is the main crystal phase of NTC thermistor materials. With the demand for materials with high resistance and low B value in a wide temperature range, materials with a spinel structure show certain limitations, that is, when the material resistivity is relatively high When the B value is high, the B value must be large, and vice versa. At the same time, the stability of the multi-system ceramic material composed of spinel structure is poor. After sintering, the material is in a non-equilibrium state, resulting in a change in the electrical properties of the material. The above two points restrict NTC. The thermal sensor has a wide application field; when we rely on changing the composition, doping modification, changing the sintering atmosphere, and the sintering system to control the microstructure, not only the efficiency is low, the consumption is large, and there is screening, sometimes it is even impossible. It is particularly important to explore new NTC thermistor materials at this time. By compounding a low B value perovskite phase in a high B value spinel phase, the resistance value in the spinel phase changes little, so as to achieve high The purpose of resistance and low B value in wide temperature range

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] a, with analytically pure La 2 o 3 、Cr 2 o 3 、Al 2 o 3 and SiO 2 It is a raw material, wherein the atomic ratio of each component is La: Cr: Al: Si = 0.6: 1.1: 0.1: 0.2, the components are mixed by the oxide method, ground for 6 hours, and calcined at 950 °C for 2.5 hours in an air atmosphere. Grinding for 6 hours to obtain a single perovskite phase oxide powder, the powder particle size is 50nm for later use;

[0025] b. To analyze pure MnO 2 、Ni 2 o 3 、Cr 2 o 3 and ZrO 2 It is a raw material, wherein the atomic ratio of each component is Mn:Ni:Cr:Zr=2.2:0.05:0.06:0.69, the components are mixed by the oxide method, ground for 6 hours, and calcined at 950°C for 2.5 hours in an air atmosphere. Grinding for 6 hours to obtain a single spinel phase oxide powder, the powder particle size is 80nm, ready for use;

[0026] c. Mix the two oxide powders of step a and step b according to the mass ratio LaCrAlSiO:MnNiCrZrO=1:2, grind for 5h, and obtain the oxide powder...

Embodiment 2

[0031] a, with analytically pure La 2 o 3 、Cr 2 o 3 、Al 2 o 3 and SiO 2 It is a raw material, wherein the atomic ratio of each component is La: Cr: Al: Si = 0.8: 0.75: 0.2: 0.25, the components are mixed by the oxide method, ground for 5 hours, and calcined at a temperature of 980 ° C for 1.5 hours in an air atmosphere. Grinding for 5 hours to obtain a single perovskite phase oxide powder, the particle size of which is 80nm, for subsequent use;

[0032] b. To analyze pure MnO 2 、Ni 2o 3 、Cr 2 o 3 and ZrO 2 It is a raw material, wherein the atomic ratio of each component is Mn:Ni:Cr:Zr=2.4:0.1:0.08:0.42, the components are mixed by the oxide method, ground for 5 hours, and calcined at a temperature of 980°C for 1.5 hours in an air atmosphere. Grinding for 5 hours to obtain a single spinel phase oxide powder, the powder particle size is 100nm, ready for use;

[0033] c. Mix the two oxide powder materials in step a and step b according to the mass ratio LaCrAlSiO:MnN...

Embodiment 3

[0038] a, with analytically pure La 2 o 3 、Cr 2 o 3 、Al 2 o 3 and SiO 2 It is a raw material, wherein the atomic ratio of each component is La: Cr: Al: Si = 1.0: 0.4: 0.3: 0.3, the components are mixed by the oxide method, ground for 8 hours, and calcined at a temperature of 1000 ° C for 2 hours in an air atmosphere. Grinding for 8 hours to obtain a single perovskite phase oxide powder, the powder particle size is 100nm, and set aside;

[0039] b. To analyze pure MnO 2 、Ni 2 o 3 、Cr 2 o 3 and ZrO 2 It is a raw material, wherein the atomic ratio of each component is Mn:Ni:Cr:Zr=2.7:0.15:0.1:0.05, the components are mixed by oxide method, ground for 8h, calcined at 1000°C for 2h in air atmosphere, twice Grinding for 8 hours to obtain a single spinel phase oxide powder, the powder particle size is 120nm, and set aside;

[0040] c. Mix the two oxide split materials in step a and step b according to the mass ratio LaCrAlSiO:MnNiCrZrO=1:5, and grind for 3.5 hours to obt...

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Abstract

The invention relates to a negative temperature coefficient thermosensitive resistor with high resistance and low B value. The resistor is prepared by the following steps: respectively grinding and calcining the oxide of raw materials lanthanum, chromium, aluminum and silicon and the oxide of raw materials manganese, nickel, chromium and zirconium to prepare a single-phase material with even particle size and good dispersibility, and then carrying out dual-phase mixing, grinding, high-temperature sintering and packaging to obtain the negative temperature coefficient thermosensitive resistor with high resistance and low B value, wherein the parameters of the resistor are as follows: R 0 DEG C=12K omega + / - 2%, and B=2050K + / - 3%. The invention has the advantages of simple preparation process, convenient operation and stable quality, can measure and control temperature and compensate circuits within wider temperature zones. Compared with the coprecipitation method, the invention enormously reduces the production cost of elements, saves energy and significantly improves production efficiency.

Description

technical field [0001] The invention relates to a high resistance, low B value negative temperature coefficient thermistor Background technique [0002] Composite NTC thermosensitive ceramic materials with excellent performance have good application prospects in the fields of temperature measurement, control, compensation and communication equipment. With the rapid development of science and technology, the demand for high resistance and low B value thermistor materials is increasing Increase. Usually AB 2 o 4 The spinel structure is the main crystal phase of NTC thermistor materials. With the demand for materials with high resistance and low B value in a wide temperature range, materials with a spinel structure show certain limitations, that is, when the material resistivity is relatively high When the B value is high, the B value must be large, and vice versa. At the same time, the stability of the multi-system ceramic material composed of spinel structure is poor. Afte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/04H01C17/00
Inventor 张惠敏常爱民王伟
Owner 中科传感(佛山)科技有限公司
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