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Rare earth oxide doped negative temperature coefficient thermistor material

A negative temperature coefficient, rare earth oxide technology, applied in the direction of resistors with negative temperature coefficient, can solve the problems of difficult to achieve low B high resistance characteristics, difficult to obtain low B high resistance characteristics, etc., to achieve good consistency, aging Stable and stable performance

Active Publication Date: 2012-06-27
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

Almost all the research results show that the NTC heat-sensitive semiconducting ceramic material whose main crystal phase is a spinel structure has a large B value when the resistivity is large, and conversely, a material with a small resistivity has a small B value, so this It is difficult for such materials to obtain low B and high resistance characteristics
The wider the required operating temperature range, the more difficult it is to achieve low B and high resistance characteristics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] a. Take by weighing analytically pure diyttrium trioxide, dichromium trioxide and manganese dioxide respectively in a molar ratio of 140:12:48, and the doping amount of dilanthanum trioxide is 0.1% by mass, mix and grind for 8 hours to make uniform;

[0020] b. Calcining the ground powder in step a at a temperature of 1200° C. for 2 hours;

[0021] c, grinding the calcined material in step b for 7 hours;

[0022] d, the material ground in step c is dripped into the adhesive prepared by starch and water to prepare a paste, and the paste is formed into a bead-shaped green body with a platinum wire as an electrode;

[0023] e. Put the bead-shaped green body formed in step d into a high-temperature-resistant crucible, put it into a high-temperature sintering furnace for sintering at a temperature of 1700°C, and keep it warm for 3 hours to obtain a rare earth oxide-doped negative temperature coefficient Thermistor material;

[0024] f. Then carry out the high temperature ...

Embodiment 2

[0026] a. Take by weighing analytically pure diyttrium trioxide, dichromium trioxide and manganese dioxide respectively at a molar ratio of 140:48:12, and the doping amount of dilanthanum trioxide is 0.5% by mass, mix and grind for 6 hours to make uniform;

[0027] b. Calcining the ground powder in step a at a temperature of 1100° C. for 1 hour;

[0028] c, grinding the calcined material in step b for 10 hours;

[0029] d, the material ground in step c is dripped into the adhesive prepared by starch and water to prepare a paste, and the paste is formed into a bead-shaped green body with a platinum wire as an electrode;

[0030] e. Put the bead-shaped body formed in step d into a high-temperature-resistant crucible, put it into a high-temperature sintering furnace for sintering at a temperature of 1600°C, and keep it warm for 4 hours to obtain a rare earth oxide-doped negative temperature coefficient Thermistor material;

[0031] f. Then conduct the high temperature aging pe...

Embodiment 3

[0033] a. Take by weighing analytically pure diyttrium trioxide, dichromium trioxide and manganese dioxide respectively in a molar ratio of 180:4:16, and the doping amount of dilanthanum trioxide is 3% by mass, mix and grind for 6 hours to make uniform;

[0034] b. Calcining the ground powder in step a at 1000° C. for 3 hours;

[0035] c, grinding the calcined material in step b for 12 hours;

[0036] d. The thermistor material ground in step c is dripped into the adhesive prepared by starch and water to prepare a paste, and the paste is formed into a bead-shaped green body with a platinum wire as an electrode;

[0037] e. Put the bead-shaped green body formed in step d into a high-temperature-resistant crucible, put it into a high-temperature sintering furnace for sintering at a temperature of 1400°C, and keep it warm for 5 hours to obtain a rare earth oxide-doped negative temperature coefficient Thermistor material;

[0038] f. Then carry out the high temperature aging perf...

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PUM

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Abstract

The invention relates to a rare earth oxide doped negative temperature coefficient thermistor material. The material is prepared by taking the oxides of analytically pure yttrium, lanthanum, chromium and manganese as raw materials, performing mixed grinding by using a solid phase mixing method, calcining and grinding to obtain a negative temperature coefficient thermistor powder material; performing dotted molding on the powder material; preparing a thermosensitive blank by using a platinum wire as an electrode lead; and performing high temperature sintering on the blank so as to obtain the rare earth oxide doped negative temperature coefficient thermistor material. The material is a composite ceramic material formed by a rare earth oxide Y2O3 and La2O3 doped perovskite structure, and is the thermistor material used in an extra-wide temperature region. The thermistor ceramic material prepared by adopting the method has the advantages of stable performance, high consistency, stable ageing property and suitability for manufacturing a thermal resistor used in the extra-wide temperature region. The thermal resistor manufactured by using the material can be used for manufacturing exhaust temperature sensors of diesel motor of motor vehicles and the like, and meeting the requirements in the fields of petroleum and geological drilling.

Description

technical field [0001] The invention relates to a rare earth oxide-doped negative temperature coefficient thermistor material, which has good negative temperature coefficient characteristics in the range of (0°C-1000°C), and can be used to manufacture ultra-wide temperature sensors represented by diesel engine exhaust temperature sensors. The temperature zone uses the sensor's new thermistor material. Background technique [0002] Wide temperature zone thermistors have important applications in the automotive industry, petroleum, and geological drilling. With the continuous upgrading of the precision of measurement systems, the requirements for the accuracy, reliability, and miniaturization of temperature sensors are also increasing. Such as the temperature sensor used in the diesel engine exhaust temperature measurement and control system of motor vehicles, etc., the exhaust temperature sensor is the information source of the on-site diagnostic system of diesel engine motor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/04C04B35/505C04B35/622
Inventor 赵青郭建高常爱民张惠敏李凤翔姚金城
Owner 中科传感(佛山)科技有限公司