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A kind of preparation method of ntc thermistor material ultrafine particle size

A thermistor, ultra-fine particle technology, applied in resistors with negative temperature coefficient, metal processing equipment, transportation and packaging, etc., can solve the problem of poor uniformity, long, generally 24 hours, or even longer, affecting the material. characteristics and other issues to achieve the effect of reducing the presence of unstable impurities

Active Publication Date: 2022-04-26
鸡西市锴欧敏感科技有限公司
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Problems solved by technology

The particle size of the sintered powder is also an important parameter. It is generally required that the powder has a suitable ultrafine particle size, and the more uniform the better, the prior art mainly uses the ball milling method to obtain the ultrafine particle size, which takes a long time to prepare. Generally, it takes 24 hours or even longer, and the uniformity is poor, or the concentration of particle size distribution is poor, which directly affects the characteristics of the material after sintering, so it is necessary to further improve the preparation method to quickly obtain ultrafine particle size and particle size Powder with higher distribution concentration

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  • A kind of preparation method of ntc thermistor material ultrafine particle size

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[0020] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0021] As an embodiment of the preparation method of the NTC thermistor material ultrafine diameter of the present invention, as figure 1 As shown, the NTC thermistor material adopts cobalt, nickel and iron powder as raw materials, including the following steps:

[0022] (1) Pour a sufficient amount of nitric acid analysis solution into a beaker, heat and keep it at 55°C-65°C;

[0023] (2) Divide the iron powder into multiple parts and gradually put them into the nitric acid analysis solution. At this time, there will be bubbles and smoke, and then enter the next step until there are no bubbles an...

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Abstract

The invention relates to a method for preparing an NTC thermistor material with an ultrafine particle diameter. The NTC thermistor material uses cobalt, nickel and iron powder as raw materials. And nickel raw material powder is not dissolved in the nitric acid analysis solution, then remove the waste liquid, and dry dry treatment to obtain ultra-fine particle size powder with a very high particle size concentration, then carry out high-temperature back-burning reduction, and finally use ball milling method The hardened powder after back-burning can be pulverized to obtain powder with ultra-fine particle size and high particle size concentration. Since the particle size of the powder before back-fired is already very fine, the hardened powder after back-fired Pulverization is very easy, only need 4-12 hours of ball milling to achieve satisfactory particle size and high concentration of particle size again, obtain ultra-fine powder in a short time, and can also reduce the instability of rejection the presence of impurities.

Description

technical field [0001] The invention relates to the technical field of manufacturing ultrafine powder, in particular to a method for preparing an NTC thermistor material with an ultrafine diameter. Background technique [0002] NTC (Negative Temperature Coefficient) refers to the thermistor phenomenon and material that decreases exponentially with temperature rise and has a negative temperature coefficient. Or two or more metal oxides are fully mixed, formed, sintered and other semiconductor ceramics can be made into a thermistor with a negative temperature coefficient. Varies with temperature and structural state. The particle size of the sintered powder is also an important parameter. Generally, it is required that the powder has a suitable ultrafine particle size, and the more uniform the better, the ball milling method is mainly used in the prior art to obtain the ultrafine particle size, and the preparation time is long. Generally, it takes 24 hours or even longer, an...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/052H01C7/04
CPCB22F1/0003H01C7/04
Inventor 李凯
Owner 鸡西市锴欧敏感科技有限公司
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