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Strontium, cerium, niobium and tungsten quaternary thermistor material with adjustable temperature zone and adjustable B value and preparation method thereof

A thermistor, quaternary system technology, applied in non-adjustable metal resistors, resistors with negative temperature coefficients, resistors, etc., can solve the problem of difficult to have high temperature and low temperature NTC characteristics at the same time

Active Publication Date: 2020-08-04
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, it is difficult for materials with the same structure and the same system on the market to have high-temperature and low-temperature NTC characteristics at the same time. Only by means of doping or compounding can the limited control of B value and temperature measurement temperature range be carried out.

Method used

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  • Strontium, cerium, niobium and tungsten quaternary thermistor material with adjustable temperature zone and adjustable B value and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] a. The general chemical formula is SrWO 4 -xCeNbO 4+δ , molar ratio of raw material to SrCO 3 :CeO 2 :Nb 2 o 5 :WO 3 = 1:0.1:0.05:1 weighing, placed in an agate mortar and ground for 6-8 hours, fully mixed evenly, to obtain an oxide powder with an average particle size of 1.353 μm;

[0021] b. Calcining the oxide powder obtained in step a at a temperature of 1200° C. for 5 hours, then grinding for 6 hours, and repeating this process twice to obtain a thermistor powder;

[0022] c, the thermistor powder that step b obtains with 30Kg / cm 2 The pressure of the block is formed for 1 minute, and the formed block is subjected to cold isostatic pressing, and the pressure is kept at 300 MPa for 3 minutes, and then the block is sintered at a temperature of 1350 ° C for 6 hours to obtain strontium, cerium, niobium and Tungsten quaternary ceramic materials;

[0023] d. Coat the front and back sides of the ceramic material obtained in step c with platinum paste electrodes, a...

Embodiment 2

[0026] a. The general chemical formula is SrWO 4 -xCeNbO 4+δ , molar ratio of raw material to SrCO 3 :CeO 2 :Nb 2 o 5 :WO 3 = 1:0.2:0.1:1 weighing, placed in an agate mortar and ground for 8 hours, fully mixed evenly, to obtain an oxide powder with an average particle size of 1.426 μm;

[0027]b. Calcining the oxide powder obtained in step a at a temperature of 1150° C. for 4 hours, then grinding for 6 hours, and repeating this process twice to obtain a thermistor powder;

[0028] c, the thermistor powder that step b obtains with 30Kg / cm 2 The pressure is briquetted for 2 minutes, the formed block is subjected to cold isostatic pressing, and the pressure is kept at 250 MPa for 3 minutes, and then the block is sintered at a temperature of 1300 ° C for 5 hours to obtain strontium, cerium, niobium and Tungsten quaternary ceramic materials;

[0029] d. Coat the front and back sides of the ceramic material obtained in step c with platinum paste electrodes, and then anneal a...

Embodiment 3

[0032] a. The general chemical formula is SrWO 4 -xCeNbO 4+δ , molar ratio of raw material to SrCO 3 :CeO 2 :Nb 2 o 5 :WO 3 = 1:0.4:0.2:1 weighing, placed in an agate mortar and ground for 8 hours, fully mixed evenly, to obtain an oxide powder with an average particle size of 1.530 μm;

[0033] b. Calcining the oxide powder obtained in step a at a temperature of 1100° C. for 3 hours, then grinding for 5 hours, and repeating this process twice to obtain a thermistor powder;

[0034] c, the thermistor powder that step b obtains with 20Kg / cm 2 The pressure of briquetting is carried out for 2 minutes, and the formed block is subjected to cold isostatic pressing, and the pressure is maintained at 250 MPa for 2 minutes, and then the block is sintered at a temperature of 1250 ° C for 4 hours to obtain strontium, cerium, niobium and Tungsten quaternary ceramic materials;

[0035] d. Coat the front and back sides of the ceramic material obtained in step c with platinum paste el...

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Abstract

The invention relates to a strontium, cerium, niobium and tungsten quaternary thermistor material with an adjustable temperature zone and an adjustable B value and a preparation method thereof. According to the material, SrCO3, CeO2, Nb2O5 and WO3 are used as raw materials; mixing, grinding, calcining, grinding, isostatic cool pressing and high-temperature sintering are performed; the SrWO4-xCeNbO4+delta thermistor ceramic material can be obtained; x is greater than or equal to 0.1 and less than or equal to 0.8, and the electrical performance parameters are as follows: B400 DEG C / 800 DEG C = 4030K-11109K + / -4.5%, and rho400 DEG C = 3.37 * 10 < 3 > ohm.cm-3.87 * 10 < 9 > ohm.cm + / -6%. According to the strontium, cerium, niobium and tungsten quaternary system negative temperature coefficientthermistor material obtained through the method, the B value, the temperature measurement interval and the resistivity of a material system can be accurately adjusted by adjusting the x value, and the adjustable temperature zone range is 200-1200 DEG C. The material has the advantages of simple preparation process, stable electrical property, good linear relationship and good consistency, can beused for temperature measurement, temperature control and line compensation in a wide temperature range, and is a novel negative temperature coefficient thermistor material suitable for manufacturinga wide temperature range thermistor.

Description

technical field [0001] The invention relates to a strontium, cerium, niobium and tungsten quaternary thermistor material with adjustable temperature range and B value and a preparation method thereof. Background technique [0002] Sensitive components and sensors are considered to be the most promising electronic technology products. For improving the international status of my country's electronic industry, the development of sensitive components is of great significance. Among them, the negative temperature coefficient (NTC) thermistor has been widely used in temperature measurement, control and compensation due to its advantages of high temperature measurement accuracy, good interchangeability, high reliability and low cost. As we all know, wide temperature range thermistors are generally thermal materials with low B value and high resistance value. Because the spinel structure NTC is in a non-equilibrium state after sintering, it is easy to cause changes in the electric...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622C04B41/88H01C7/04
CPCC04B35/495C04B35/622C04B41/88C04B41/5116C04B41/009H01C7/043C04B2235/3213C04B2235/3229C04B2235/3251C04B2235/602C04B2235/6567C04B41/4539C04B41/0072
Inventor 高博李晓卉常爱民
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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