Manufacturing method of high-precision, high-reliability ntc thermistor chip

A technology of a thermistor chip and a manufacturing method, which is applied in the manufacturing field of high-precision and high-reliability NTC thermistor chips, can solve the problems of low temperature, influence on electrical conductivity and welding performance, silver layer oxidation, etc., so as to reduce sintering The effect of temperature and efficient sintering

Active Publication Date: 2014-10-08
GUANGZHOU MAGNET ELECTRICITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The aging temperature is low, the effect is not obvious, and the high temperature is easy to cause the silver layer to oxidize, and the resistance value and B value will change.
Aging in nitrogen can increase the aging temperature, but at the same time it will cause the reaction between nitrogen and silver layer to form silver nitride, which will affect the electrical conductivity and soldering performance

Method used

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  • Manufacturing method of high-precision, high-reliability ntc thermistor chip
  • Manufacturing method of high-precision, high-reliability ntc thermistor chip
  • Manufacturing method of high-precision, high-reliability ntc thermistor chip

Examples

Experimental program
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Effect test

Embodiment 1

[0044]Use an analytical balance to accurately weigh 405.2g of manganese tetraoxide, 457.04g of nickel oxide, 599.30g of ferric oxide, and 39.42g of aluminum oxide. The above mixture is ball-milled for 20 hours, dried, crushed, and calcined at 950°C for 2 hours, and then again Ball mill for 20 hours to get traditional coarse powder (particle size of powder is 1-5μm). According to the same molar ratio of metal ions, nickel nitrate, manganese nitrate, iron nitrate and aluminum nitrate were formulated into a 0.7mol / L aqueous solution, adjusted to pH = 7 with ammonia water, ultrasonically spray-dried under stirring, and calcined at 450°C for 4 hours to obtain Nano powder. Weigh 375g of this nano-powder and add it to the coarse-grained powder, and add deionized water to make a slurry while stirring. 25wt%. Filter the mud in a filter press molding mold, pressurize at 10Mpa, hold the pressure for 2 minutes, make a cylinder with a diameter of 52mm and a height of 16mm, bake at 100°C ...

Embodiment 2

[0052] Use an analytical balance to accurately weigh 385.1g of trimanganese tetraoxide, 146.48g of nickel oxide, 499.30g of ferric oxide, and 500.31g of cobalt oxide. The above mixture is ball milled for 20 hours, dried, crushed, and calcined at 850°C for 2 hours, and then again Ball mill for 20 hours to get traditional coarse powder (particle size of powder is 1-5μm). According to the same molar ratio of metal ions, nickel nitrate, manganese nitrate, iron nitrate and cobalt nitrate were formulated into a 0.7 mol / L aqueous solution, adjusted to pH = 7 with ammonia water, ultrasonically spray-dried under stirring, and calcined at 500 ° C for 4 hours to obtain Nano powder. Weigh 689g of this nano-powder and add it to the coarse-grained powder, and add deionized water while stirring. The amount of water added accounts for 25wt% of the mixed powder (ie, the above-mentioned nano-powder + coarse-grained powder). Filter the mud in a filter press forming mold with a pressurization pr...

Embodiment 3

[0060] Use an analytical balance to accurately weigh 420.2g of manganese tetraoxide, 487.04g of cobalt oxide, 499.30g of ferric oxide, and 40.40g of aluminum oxide. The above mixture is ball milled for 20 hours, dried, crushed, and calcined at 1000°C for 2 hours, and then again After ball milling for 20 hours, traditional coarse powder (particle size of powder is 1-5 μm) is obtained. According to the same molar ratio of metal ions, cobalt nitrate, manganese nitrate, iron nitrate and aluminum nitrate were formulated into a 0.7 mol / L aqueous solution, adjusted to pH = 7 with ammonia water, ultrasonically spray-dried under stirring, and calcined at 500 ° C for 4 hours to obtain Nanocomposite powder. Weigh 506.2g of this nano powder and add it to the coarse powder, add deionized water while stirring, the amount of water added accounts for 25wt% of the mixed powder (namely the above nano powder + coarse powder) . Filter the mud in a filter press molding mold, pressurize at 10Mpa,...

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Abstract

The invention discloses a manufacturing method of a high-precision and high-reliability NTC thermistor chip, comprising the following steps: 1) weighing the corresponding metal oxide according to the chemical formula Mn3-x-y-zNixFeyCozQtO4, mixing ball milling, and calcining into thermosensitive ceramics Pre-powder A; 2) Mix heat-sensitive ceramic pre-powder A and nanoscale heat-sensitive ceramic pre-powder B uniformly to form a mixture, and make the mixture into a slurry, wherein the mass percentage of B in the mixture is 5-75wt%, the solid content of the slurry is 70-80wt%; 3) Press the slurry to form a green body, dry the green body, and then isostatically press the green body; 4) The obtained in step 3) Microwave sintering of the green body; 5) slice the obtained sintered block, put electrodes on it, and conduct heat treatment under a protective gas atmosphere. The 1% yield of the chip prepared by the invention has been greatly improved, and the reliability has also been obviously improved.

Description

technical field [0001] The invention relates to a manufacturing method of an NTC thermistor chip with high precision and high reliability. Background technique [0002] Negative temperature coefficient (NTC) thermistors refer to electronic ceramic materials whose resistance decreases with increasing temperature, and are widely used in temperature sensors to measure temperature. In recent years, with the development of science and technology, higher and higher requirements have been put forward for the accuracy of temperature measurement and temperature control. Generally, NTC thermistor chips are required to have the characteristics of high precision and high reliability. High precision mainly refers to the requirement that the resistance value of the thermistor chip and the accuracy of the material constant B value should be controlled within ±1%, and the resistance value and material constant B value change little during use. Reliability is usually described by the aging...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/32C04B35/622
Inventor 谭育新谢春林谭小桩
Owner GUANGZHOU MAGNET ELECTRICITY
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