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NTC thermistor chip and preparation method thereof

A thermistor chip and wafer technology, applied in the direction of resistors, resistor components, non-adjustable metal resistors, etc., can solve problems affecting service life and stability, R value and B value drift, etc., to prevent resistance Value drift or even failure, high B value, the effect of meeting the requirements of use

Active Publication Date: 2021-03-12
青岛三元传感技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the related technologies mentioned above, the inventor believes that when the NTC thermistor is in use, it is prone to drift in R value and B value after long-term high-temperature aging, which affects its service life and stability

Method used

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  • NTC thermistor chip and preparation method thereof
  • NTC thermistor chip and preparation method thereof
  • NTC thermistor chip and preparation method thereof

Examples

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preparation example 1

[0053] Preparation Example 1: Put cobalt oxalate in a zirconia sagger, place the zirconia sagger in a muffle furnace, heat from room temperature to 800°C for 9 hours, then raise the temperature to 850°C for 40 minutes, Insulate at 850°C for 40min and cool to below 75°C to prepare Co 3 O 4 .

preparation example 2

[0054] Preparation Example 2: Put cobalt oxalate in a zirconia sagger, put the zirconia sagger in a muffle furnace, heat from room temperature to 800°C for 8.5 hours, then raise the temperature to 850°C for 35 minutes , kept at 850°C for 35min, and cooled to below 75°C to obtain Co 3 O 4 .

preparation example 3

[0055] Preparation Example 3: Put cobalt oxalate in a zirconia sagger, put the zirconia sagger in a muffle furnace, heat from room temperature to 800°C for 8 hours, then raise the temperature to 850°C for 30 minutes, Insulate at 850°C for 30min, cool to below 75°C to prepare Co 3 O 4 .

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Abstract

The invention relates to the technical field of thermistors, and particularly discloses an NTC thermistor chip and a preparation method thereof. The NTC thermistor chip is prepared from the followingraw materials in parts by weight of 538.28-538.38 parts of Mn3O4, 24.88-24.98 parts of NiO and 436.69-436.79 parts of Co3O4, and the preparation method comprises the following steps of S1, weighing materials; S2, mixing; S3, drying, crushing and calcining; S4, micro-crushing; S5, carrying out spray granulation; S6, tabletting and forming; S7, pre-sintering; S8, sintering; S9, polishing and cleaning; and S10, brushing silver and cutting. The NTC thermistor chip has the advantages that the consistency of the resistance value and the B value is good, the resistance drift rate is smaller than 1% after the NTC thermistor chip is used in a high-temperature environment for a long time, the service life is long, and the stability is high; in addition, the preparation method has the advantages of being high in particle dispersion degree, not prone to agglomeration and high in chip breaking strength.

Description

technical field [0001] The present application relates to the technical field of thermistors, more specifically, it relates to an NTC thermistor chip and a preparation method thereof. Background technique [0002] The thermistor is a sensitive element, which is divided into PTC (positive temperature coefficient thermistor) and NTC (negative temperature coefficient thermistor) according to the temperature coefficient. The typical feature of thermistor is that it is sensitive to different temperature , Different resistance values ​​are exhibited at different temperatures. The higher the temperature of the PTC thermistor, the greater the resistance value. The higher the temperature of the NTC thermistor, the lower the resistance value. They both belong to semiconductor devices. [0003] NTC thermistor is a semiconductor ceramic made of two or more metal oxides such as manganese, cobalt, nickel, copper, silicon, zinc, etc., which are fully mixed, formed, and sintered. With many...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/04H01C1/034
CPCH01C7/043H01C1/034
Inventor 鱼灌金成慧赵振波张向营
Owner 青岛三元传感技术有限公司
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