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Thermistor material and preparation method and application thereof

A thermistor and resistor technology, applied in the field of resistance materials, can solve the problems of high resistivity and high B value

Inactive Publication Date: 2017-01-04
GUANGDONG FENGHUA ADVANCED TECH HLDG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the thermal constant (B value) of traditional NTC thermistor materials is generally in the range of 2000K to 6000K, and the resistivity is generally above 2Ω·cm
The B value is high and the resistivity is large, so it is not suitable for temperature attenuation compensation in special occasions such as low temperature, high frequency, and high power.

Method used

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  • Thermistor material and preparation method and application thereof
  • Thermistor material and preparation method and application thereof
  • Thermistor material and preparation method and application thereof

Examples

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preparation example Construction

[0036] Such as figure 1 As shown, a method for preparing a thermistor material according to an embodiment includes the following steps S110-S150.

[0037] S110, mixing the La-containing compound, the Sr-containing compound, the Co-containing compound and the Fe-containing compound according to the stoichiometry in the general chemical formula of the thermistor material to form a mixed ingredient.

[0038] Among them, the general chemical formula of the thermistor material is La x Sr 1-x co y Fe 1-y o 3 , 0<x<1, 0<y<1.

[0039] Furthermore, 0.6≤x≤0.9, 0.4≤y≤0.8. The La-containing compound, the Sr-containing compound, the Co-containing compound and the Fe-containing compound are uniformly mixed according to the stoichiometric amount in the general chemical formula.

[0040] Specifically, the La-containing compound is La 2 o 3 (lanthanum trioxide), the Sr-containing compound is Sr 2 CO 3 (strontium carbonate), the Co-containing compound is Co3 o 4 (cobalt tetroxide), ...

Embodiment 1

[0068] Preparation of La 0.8 Sr 0.2 co 0.4 Fe 0.6 o 3 Porcelain body

[0069] According to the general chemical formula La 0.8 Sr 0.2 co 0.4 Fe 0.6 o 3 The stoichiometric ratio is weighed to carry out batching by weighing dilanthanum trioxide, strontium carbonate, tricobalt tetroxide and ferric oxide. Put the weighed raw materials into a ball mill jar, add absolute ethanol as the ball milling medium, and zirconia balls as the grinding balls, wherein the quality of the absolute ethanol is 1 times that of the mixed ingredients, and the quality of the zirconia balls is 1 / 2 of the mixed ingredients. 5 times, ball milling and mixing for 6 hours, the speed is 250r / min. The ball-milled slurry was dried with anhydrous ethanol at 85°C and then pre-calcined. The pre-fired temperature was 1100°C, the heating rate was 2°C / min, and the temperature was kept for 12 hours to obtain the pre-fired material. Add absolute ethanol to the calcined material again as a ball milling medium,...

Embodiment 2

[0072] Preparation of La 0.8 Sr 0.2 co 0.7 Fe 0.3 o 3 Porcelain body

[0073] According to the general chemical formula La 0.8 Sr 0.2 co 0.7 Fe 0.3 o 3 The stoichiometric ratio is weighed to carry out batching by weighing dilanthanum trioxide, strontium carbonate, tricobalt tetroxide and ferric oxide. Put the weighed raw materials into a ball mill jar, add absolute ethanol as the ball milling medium, and add zirconia balls as the grinding balls, wherein the mass of absolute ethanol is 1 times that of the mixed ingredients, and the mass of the zirconia balls is the mass of the mixed ingredients 5 times of that, ball milling and mixing for 6 hours at a speed of 250r / min. The ball-milled slurry was dried with anhydrous ethanol at 85°C and then pre-calcined. The pre-fired temperature was 1100°C, the heating rate was 2°C / min, and the temperature was kept for 12 hours. The calcined material is again made of absolute ethanol as the ball milling medium, and zirconia balls a...

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Abstract

The invention discloses a thermistor material and a preparation method and application thereof. The chemical general formula of the thermistor material is LaxSr1-xCoyFe1-yO3, wherein 0.5 < x< 1, and 0 < y< 1. Four kinds of metal elements and O form a La-Sr-Co-Fe-O system. Theratio of the sum of the mole number of two elements La and Sr to the sum of the mole number of two elements Co and Fe is 1:1,0.5< x< 1, and the proportion of the element La in the thermistor material is higher than the proportion of the element Sr in the thermistor material. A test proves that the thermistor material has good crystallinity, a B value is low, and the resistivity is smaller. The thermistor material can be applied to the temperature attenuation compensation ofspecific occasions such as low temperature, high frequency and high power.

Description

technical field [0001] The invention relates to the technical field of resistance materials, in particular to a thermistor material and its preparation method and application. Background technique [0002] Thermistor is a kind of sensitive element that is sensitive to temperature and exhibits different resistance values ​​at different temperatures. According to different temperature coefficients, it is divided into positive temperature coefficient thermistor (PTC) and negative temperature coefficient thermistor. (NTC). Among them, the negative temperature coefficient thermistor (NTC) is a kind of semiconductor material whose resistance value decreases with the increase of temperature. It has the functions of temperature measurement, temperature control, temperature compensation, and surge suppression. [0003] NTC thermistor materials are usually spinel solid solutions composed of transition metal oxides. Generally, it has one or two metal elements and oxygen to form a cry...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B41/88
CPCC04B35/2633C04B41/009C04B41/5111C04B41/88
Inventor 沓世我李振昕朱佩付振晓杨曌
Owner GUANGDONG FENGHUA ADVANCED TECH HLDG
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