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Preparation method of negative temperature coefficient thermistor material

A technology of negative temperature coefficient and thermistor, which is applied to resistors with negative temperature coefficient, resistors, non-adjustable metal resistors, etc., to achieve the effect of simple raw materials, stable adjustment performance and wide application temperature range.

Active Publication Date: 2021-12-07
WEIHAI KEBOLE AUTOMOBILE ELECTRONICS CO LTD +1
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Problems solved by technology

Due to the SiO2 glass in this technical solution, there is a problem of aging stability

Method used

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  • Preparation method of negative temperature coefficient thermistor material

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Effect test

Embodiment Construction

[0017] Method example:

[0018] a. Take La2O3, MnCO3, CaCO3, ZrO2 as raw material, according to La2O3 is 22.5~47.5, CaCO3 is 5~55, Mn is 45~95, ZrO2 is 5~55 molar ratio after mixing, add water ball and grind into slurry, described The ball milling conditions are: material: ball: water ratio 1:3:3, ball milling time is 8 hours;

[0019] b. drying and calcining the slurry to obtain a solid powder material, the drying temperature is 250°C, the calcining temperature is 900-1200°C, and the time is 2-8 hours;

[0020] C. Add water to the solid powder material again and dry it after ball milling, and sinter to obtain the negative temperature coefficient thermistor material after pressing and molding. The ball milling condition is: material: ball: water is 1:3:3, and the ball milling time is 8 hours, the drying temperature is 250°C, the calcination temperature is 900-1200°C, and the time is 2-8 hours;

[0021] Adopt each embodiment of above-mentioned method and performance to refer ...

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Abstract

The invention discloses a preparation method of a negative temperature coefficient thermistor material, which solves the problem that iron, cobalt and nickel elements are inevitably introduced into the existing thermistor material. The technical solution is made of the following molar ratios of raw materials: La2O3 is 22.5-47.5, CaCO 3 5~55, Mn 45~95, ZrO 2 It is 5-55, and Fe in raw materials is controlled to be less than 0.001, Co is less than 0.001, and Ni is less than 0.001. The raw material of the present invention is simple, does not add any one of the three elements of Fe, Co, Ni or their compounds, and can realize the adjustment of the resistance value at room temperature and the B value of the material constant in a wide range by adjusting the content of CaZrO3 and LaMn3. The performance is stable and suitable for Wide temperature range.

Description

technical field [0001] The invention relates to the field of thermistor materials, in particular to a preparation method of negative temperature coefficient thermistor materials. Background technique [0002] In the new century, with the rapid development of communication and other fields, especially in recent years, the requirements for the electromagnetic anti-interference ability of terminal communication equipment are getting higher and higher. These requirements bring great challenges to the design and layout of weak current lines, and large capacitive and inductive reactance may affect the reliability of communication. In this case, the development of components with high reliability, low capacitive reactance and low inductive reactance is becoming more and more urgent. Traditional thermistor materials are generally composed of transition elements manganese, cobalt, nickel and iron oxides. As we all know, due to the electron arrangement of iron, cobalt and nickel elem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/04C04B35/48C04B35/50C04B35/622
CPCC04B35/48C04B35/50C04B35/622C04B2235/3227C04B2235/3244C04B2235/442H01C7/043
Inventor 廖园富何鹏飞
Owner WEIHAI KEBOLE AUTOMOBILE ELECTRONICS CO LTD
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