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High-temperature negative temperature coefficient thermistor material and manufacturing method thereof

A negative temperature coefficient, thermistor technology, applied in the direction of resistors with negative temperature coefficient, resistance manufacturing, resistors, etc., can solve the problems of durability, large change rate, etc. The effect of reducing temperature loss

Inactive Publication Date: 2021-05-18
深圳市特普生科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a high-temperature negative temperature coefficient thermistor material and its manufacturing method, which solves the problems of durability and large change rate

Method used

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  • High-temperature negative temperature coefficient thermistor material and manufacturing method thereof
  • High-temperature negative temperature coefficient thermistor material and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Weigh manganese tetraoxide, chromium oxide, aluminum oxide, yttrium oxide, and calcium oxide high-purity powder in proportion, and the formula ratio is: yttrium: manganese: chromium: aluminum: calcium = 55:23:23:0.5 : 3.5;

[0042] (2) Put the powder into the ball mill tank, add a small amount of grinding aid, ball mill according to the weight ratio of material ball to water 1:1:8, dry at 80 degrees, and pre-fire at 1080 degrees for 2-4 hours;

[0043] (3), after pre-burning, ball milling into a powder with a particle size of 1-3 microns, and drying at 80 degrees;

[0044] (4), then the powder after ball milling is pre-pressed into a 20*10mm embryo body, and then isostatically pressed, with a pressure of 2-3MPa / cm2;

[0045] (5), after isostatic pressing, sinter at 1450 degrees for 2 hours to obtain the thermistor porcelain ingot;

[0046] (6) Cut the porcelain ingot into 0.3-0.6mm thick porcelain slices by a semiconductor cutting machine;

[0047] (7), then the ...

Embodiment 2

[0052] (1) Weigh trimanganese tetraoxide, chromium oxide, aluminum oxide, yttrium oxide, and calcium oxide high-purity powder in proportion, and the formula ratio is: yttrium: manganese: chromium: aluminum: calcium = 75:9:9:0.5 : 6.5;

[0053] (2) Put the powder into the ball mill tank, add a small amount of grinding aid, ball mill according to the weight ratio of material ball to water 1:1:8, dry at 80 degrees, and pre-fire at 1200 degrees for 2-4 hours;

[0054] (3), after pre-burning, ball milling into a powder with a particle size of 1-3 microns, and drying at 80 degrees;

[0055] (4), then the powder after ball milling is pre-pressed into a 20*10mm embryo body, and then isostatically pressed, with a pressure of 2-3MPa / cm2;

[0056] (5), sintering at 1500 degrees for 4 hours after isostatic pressing, the thermistor porcelain ingot was obtained;

[0057] (6) Cut the porcelain ingot into 0.3-0.6mm thick porcelain slices by a semiconductor cutting machine;

[0058] (7), then...

Embodiment 3

[0063] (1) Weigh manganese tetraoxide, chromium oxide, aluminum oxide, yttrium oxide, and calcium oxide high-purity powder in proportion, and the formula ratio is: yttrium: manganese: chromium: aluminum: calcium = 92:3:3:0 :2;

[0064] (2) Put the powder into the ball mill tank, add a small amount of grinding aid, ball mill according to the weight ratio of material ball to water 1:1:8, dry at 80 degrees, and pre-fire at 1300 degrees for 2-4 hours;

[0065] (3), after pre-burning, ball milling into a powder with a particle size of 1-3 microns, and drying at 80 degrees;

[0066] (4), then the powder after ball milling is pre-pressed into a 20*10mm embryo body, and then isostatically pressed, with a pressure of 2-3MPa / cm2;

[0067] (5), after isostatic pressing, sinter at 1600 degrees for 4 hours to make thermistor porcelain ingot;

[0068] (6) Cut the porcelain ingot into 0.3-0.6mm thick porcelain slices by a semiconductor cutting machine;

[0069] (7), then the tiles are cle...

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Abstract

The invention discloses a high-temperature negative temperature coefficient thermistor material, which comprises manganese oxide, chromium oxide, aluminum oxide, yttrium oxide and calcium oxide, and is prepared by the following steps: carrying out grinding, pre-sintering, ball-milling, pre-forming, isostatic pressing and finally high-temperature solid-phase sintering to obtain thermistor ceramic, slicing the thermistor ceramic by a semiconductor process, carrying out electric polarization, and scribing the ceramic to obtain small square thermistor sheets; and packaging the small square sheet into the single-ended glass-sealed thermistor. According to the formula designed by the invention, the single-end thermistor with B25 / 50 = 2100-2850K and R25 = 5-200K can be repeatedly prepared, and the temperature resistance can reach -50 to +900 DEG C; after the material is aged for 1000 hours in an air environment of 600 DEG C, the change rate is less than 5%, so that the thermistor can correspondingly change along with the change of ambient temperature in use; the thermistor can correspondingly change the ambient temperature in real time, the corresponding temperature loss is reduced and the sensitivity of the thermistor is improved; meanwhile, due to the aluminum oxide or calcium oxide, the quality of the thermistor during sintering is improved, and the density of the thermistor is increased.

Description

technical field [0001] The invention relates to the technical field of semiconductor thermistors, in particular to a high-temperature negative temperature coefficient thermistor material and a manufacturing method thereof. Background technique [0002] Negative temperature coefficient thermistor material (NTC) is a kind of semiconductor electronic ceramics. It is a sensitive material most widely used in the field of temperature measurement. Its characteristic is that its impedance changes with temperature changes. This one-to-one correspondence The relationship determines the temperature coefficient and microscopic crystal structure of the material; on the contrary, the temperature curve characteristics of each thermistor are subject to a series of microscopic factors such as its crystal structure, composition, size, and material composition, so the controllability of the material structure 1. The uniformity of material composition plays a vital role in the repeatability and...

Claims

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Application Information

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IPC IPC(8): C04B35/505C04B35/50C04B35/622H01C7/04H01C17/00
CPCC04B35/505C04B35/50C04B35/622H01C7/043H01C17/00C04B2235/3262C04B2235/3241C04B2235/3217C04B2235/3208C04B2235/656C04B2235/6567C04B2235/3227C04B2235/3229
Inventor 曾招停
Owner 深圳市特普生科技有限公司