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NTC (negative temperature coefficient) thermal-sensitive material with low resistivity and high B-value and preparation method thereof

A technology with negative temperature coefficient and low resistivity, applied in the direction of resistors with negative temperature coefficient, etc., to achieve the effect of low resistivity, high B value and good consistency

Active Publication Date: 2014-07-02
山东摩信新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Initially, the negative temperature coefficient thermistor usually uses 3~4 kinds of oxides of transition metals Mn, Co, Ni, Fe, Cu, as the main formula, and at the same time, some high-priced or low-priced other metallized oxides and For some rare earth elements, the resistivity of the material ranges from a few ohm cm to several thousand ohm cm, and the B value (material coefficient) is in the range of 1000~4300K; the nominal resistance value of the thermistor made of these materials is several From hundreds of ohms to hundreds of thousands of ohms, so far, this series of formula material solutions has not had an ideal manufacturing method for low resistance / high B value negative temperature coefficient heat-sensitive materials that achieve high precision, high consistency and interchangeability

Method used

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  • NTC (negative temperature coefficient) thermal-sensitive material with low resistivity and high B-value and preparation method thereof
  • NTC (negative temperature coefficient) thermal-sensitive material with low resistivity and high B-value and preparation method thereof
  • NTC (negative temperature coefficient) thermal-sensitive material with low resistivity and high B-value and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Formulation: with Mn 3 o 4 、Co 3 o 4 、Al 2 o 3 As raw material, the purity is industrial grade, take Mn 3 o 4 :Co 3 o 4 :Al 2 o 3 =50:40:10(%wt)+6%(additive) =53:40:7(%wt)+6%(additive) =56:40:4(%wt)+6%(additive) =58 : 40: 2 (% wt) + 6% (additive); Additive: Nb 2 o 5 : TiO 2 : ZrO =60:30:10%wt, ball milled for 8 hours;

[0020] (2) Ball mill the above proportioned ingredients for 10 hours, material: water: ball = 1.0:1.2:1.5;

[0021] (3) Granulation: Add 25% wt of PVA glue solution with a concentration of 10% to the powder, manually granulate, and pass through a 80-200 mesh sieve;

[0022] (4) Forming: Use 20Mpa pressure to form a Ф5.4 (mm) × 1.2mm green sheet, and the pressing density is 3.2g / cm 3 ;

[0023] (5) Put the formed blank into a ceramic bowl and sinter at a high temperature of 1250°C for 3 hours. The sintering curve is:

[0024] From room temperature to 500°C, the heating rate is 0.5°C / min,

[0025] 500℃~500℃ constant temperature for ...

Embodiment 2

[0037] The main formula is MnO 2 :Co 3 o 4 、Al 2 o 3 =56:40:4%wt, the amount of additives is taken as 1.0, 3.0, 5.0, 7.0, 10.0, 12.0%wt respectively, and the samples of Ф10 are made according to the process of Example 1, and the test results are as follows (with 100 pieces chip statistics)

[0038]

[0039] The results show that with the increase of the additive amount, the resistance value decreases, and the B value also decreases obviously. When the amount of additives reaches 12%, the resistance is 147Ω, the B value is only 4030K, and the dispersion of the material becomes larger.

Embodiment 3

[0041] The formula takes MnO 2 :Co 3 o 4 、Al 2 o 3 =53:40:7%wt, the amount of additives is 6%wt [according to the process of Example 1] to make Ф10 blanks, and sintered at different sintering temperatures. The measurement results of the samples are as follows (statistics based on 100 chips)

[0042]

[0043] The results show that when the sintering temperature is lower than 1230°C and higher than 1270°C, the consistency of the sample will deteriorate, so the optimum temperature is 1230-1270°C. If the amount of Al in the formula increases, the sintering temperature increases, and the same amount of Al decreases, the sintering temperature Contains a corresponding reduction.

[0044] The material formulation and preparation technology of the present invention can be produced in batches, and the performance of the material meets various parameters required by the temperature sensor. This material has the characteristics of low resistivity / high B value, is an important mater...

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Abstract

The invention relates to the field of thermal-sensitive materials, specifically discloses an NTC (negative temperature coefficient) thermal-sensitive material with low resistivity and high B-value and a preparation method thereof. The NTC thermal-sensitive material with low resistivity and high B-value employs Mn-Co-Al oxides as main components, and is characterized in that the material is prepared by mixing low-valent metal particles Nb2O5 and high-stable impurities TiO2 and ZrO into the main components, wherein the main components comprises Mn3O4, Co3O4 and Al2O3 in the weight ratio of (50-60): (40-55): (2-10). The material provided by the invention has the characteristics of low resistivity and high B-value, is the important material required by temperature sensors, and is good in consistency, repeatability and stability.

Description

(1) Technical field [0001] The invention relates to the field of heat-sensitive materials, in particular to a low-resistivity, high-B value negative temperature coefficient heat-sensitive material and a preparation method thereof. (2) Background technology [0002] Components and sensors made of low resistivity, high B-value negative temperature coefficient thermal materials are widely used in temperature measurement, temperature control, temperature compensation and circuit overcurrent protection in various fields. However, due to the current low-resistivity and high-B-value products at home and abroad, the accuracy is relatively low compared to MEMS digital sensors. Therefore, the ability to manufacture low-resistivity / high-B-value low-cost materials with higher precision has become the goal pursued by the same industry around the world. . [0003] Initially, the negative temperature coefficient thermistor usually uses 3~4 kinds of oxides of transition metals Mn, Co, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/04C04B35/01C04B35/622C04B35/64
Inventor 刘倩朱金鸿李本文
Owner 山东摩信新材料科技有限公司