Method for preparing negative temperature coefficient (NTC) thermistor and NTC thermistor chip manufactured by same

Abstract

The invention discloses a composition for preparing negative temperature coefficient (NTC) thermistor chip and an NTC thermistor chip manufactured by the same, which belong to the field of thermistors. The content of constituents of the composition is 750-765 weight parts of Mn3O4 and 240-245 weight parts of NiO, the Mn3O4 and the NiO are nanometer powder, and the purity of the Mn3O4 and the NiO is chemical pure. The composition is manufactured into chip slurry by the following steps of weighting raw materials according to the constituent and the content, evenly mixing the raw materials to be poured in a ball grind mill, and adding water to grind for 30-50 hours; dewatering and drying the ground raw materials; and adding a binding agent into the dried raw materials to be stirred evenly to form the chip slurry. The invention further discloses a method using the chip slurry to manufacture the NTC thermistor. The proportion of the constituents of the composition for the NTC thermistor can be adjusted to prolong service of a resistor, improve measurement accuracy and meet using requirements of electric appliances of air conditioners and the like.

Description

technical field [0001] The invention relates to the field of thermistors, in particular to a composition for an NTC thermistor chip and an NTC thermistor of a chip made of the composition. Background technique [0002] Thermistors are a type of sensitive components. They are divided into PTC (Positive Temperature Coefficient, positive temperature coefficient) thermistors and NTC (Negative Temperature Coefficient, negative temperature coefficient) thermistors according to their temperature coefficients. A typical feature of a thermistor is that it is sensitive to temperature and exhibits different resistance values ​​at different temperatures. The higher the temperature of the PTC thermistor, the greater the resistance value, and the lower the resistance value of the NTC thermistor, both belong to semiconductor devices. [0003] NTC thermistor has the advantages of high sensitivity, fast response, small size, and easy remote control and measurement. It is widely used in refr...

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Problems solved by technology

In the process of realizing the present invention, the inventor found that the prior art has at least the following problems: the thermal time constant of the NTC thermistor commonly used in the market is about 7s, and the phenomenon of slow temperature sensing often occurs during use; When the thermistor is used in air conditioners and other electrical appliances, it needs to withstand high and low temperature shocks. Generally, the high and low temperature shocks are about 1000 times, and the resistance value deviation can reach more than 3%. Frequent startup of air conditioners and other electrical appliances will cause this type of thermistor to fail. ; Due to the insufficient thickness and density of the chip, the chip is easily broken down and failed when the current is passed repeatedly

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