NTC (Negative Temperature Coefficient) thermistor material with high B value and high stability and production method thereof
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A thermistor, high stability technology, applied in the field of NTC thermistor material and its production, to achieve the effects of suppressing surge current, fast response and high sensitivity
Active Publication Date: 2012-06-27
肇庆市金龙宝电子有限公司
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Problems solved by technology
[0007] The NTC thermistor materials currently produced generally have a small material constant B, so the sensitivity of the thermistor needs to be further improved
Method used
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Embodiment 1
[0024] Embodiment 1: A kind of NTC thermistor material of high B value, high stability, it is characterized in that containing weight percent is: 37.5% Co, 20% Fe, 4.5% Al, 0.3% Cu, 0.3% of Nd, 0.2% of Zr, and the balance of Mn.
[0025] Above-mentioned each component is made into the production method of thermistor material of the present invention, comprises the following steps:
[0026] 1. Ingredients: For each raw material Mn containing the above components 3 o 4 , CO 3 o 4 , Fe 2 o 3 、Al 2 o 3 , CUO, Nd 2 o 3 and ZrO 2 , carry out the moisture test before use, the test temperature is 120°C±10°C, and the constant temperature time is 3-5 minutes; each raw material is batched according to the weight percentage of the above ingredients, and the moisture is deducted according to the moisture content of the raw material when batching;
[0027] 2. Ball milling: Mix the prepared raw materials evenly, and then ball mill them to grind and refine them;
[0028] 3. Dry...
Embodiment 2
[0034] Embodiment 2: A kind of NTC thermistor material of high B value, high stability, it is characterized in that containing weight percent is: 30% Co, 15% Fe, 1% Al, 0.1% Cu, 0.1% The Nd of 0.05%, the Zr of 0.05%, the balance is Mn, and its production method is identical with embodiment 1.
Embodiment 3
[0035] Embodiment 3: a kind of NTC thermistor material of high B value, high stability, it is characterized in that containing weight percent is: 45% Co, 25% Fe, 8% Al, 0.5% Cu, 0.5% of Nd, 0.4% of Zr, and the balance of Mn. Its production method is identical with embodiment 1.
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Abstract
The invention discloses an NTC (Negative Temperature Coefficient) thermistor material with a high B value and a high stability and a production method thereof. The NTC thermistor material is characterized by comprising the following raw materials by weight percent: 30-45% of Co, 15-25% of Fe, 1-8% of Al, 0.1-0.5% of Cu, 0.1-0.5% of Nd, 0.05-0.4% of Zr, and the balance of Mn. According to the production method, the raw materials are placed into a ball-milling device and are subjected to the processes of wet ball milling, pre-sintering, molding, sintering, and the like, thereby obtaining the end products. The production method of powder wet-mixing and secondary ball-milling is adopted, so that the material constant B value of the thermistor material is greatly increased; the material constant B value can reach up to 4500K; and an NTC thermistor made of the NTC thermistor material provided by the invention has the characteristics of high sensitivity, high response speed, stable performance and excellent interchangeability, and can be widely applied to the situations, such as temperature measurement, temperature compensation, surge current restraining, and the like.
Description
technical field [0001] The invention relates to a thermistor material and a production method thereof, in particular to an NTC thermistor material and a production method thereof. Background technique [0002] NTC (Negative Temperature Coefficient) refers to a material whose resistance decreases exponentially with temperature rise and has the characteristics of a thermistor with a negative temperature coefficient. The material is a semiconductor ceramic made by fully mixing, molding and sintering two or more metal oxides such as manganese, cobalt, iron, nickel, copper, silicon, zinc, etc., and can be made with a negative temperature coefficient. (NTC) thermistor body. Its resistivity and material constants vary with material composition ratio, sintering atmosphere, sintering temperature and structural state. Now there are also non-oxide NTC thermistor materials represented by silicon carbide, tin selenide, and tantalum nitride. the [0003] NTC heat-sensitive semiconduct...
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