Manufacturing method of high-precision and high-reliability NTC thermistor chip
A technology of a thermistor chip and a manufacturing method, which is applied in the manufacture of high-reliability NTC thermistor chips and high-precision fields, can solve problems such as affecting electrical conductivity and welding performance, low temperature, resistance value and B value change, etc. To achieve the effect of efficient sintering and lower sintering temperature
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[0043] Example 1:
[0044] Use an analytical balance to accurately weigh 405.2g of trimanganese tetroxide, 457.04g of nickel oxide, 599.30g of ferric oxide, and 39.42g of aluminum oxide. The above mixture was ball-milled and mixed for 20h, dried, crushed and calcined at 950℃ for 2h, and then again Ball mill for 20h to obtain traditional coarse particle powder (the particle size of the powder is 1-5μm). According to the same molar ratio of metal ions, nickel nitrate, manganese nitrate, iron nitrate and aluminum nitrate were mixed into a 0.7mol / L aqueous solution, adjusted to pH=7 with ammonia water, ultrasonic spray-dried under stirring, and calcined at 450℃ for 4h to obtain Nano powder. Weigh 375g of this nano-powder and add it to the coarse-grained powder, add deionized water while stirring to make a slurry, where the added amount of water accounts for the mixed powder (ie the above-mentioned nano-powder + coarse-grained powder) 的25wt%. Press the mud in a filter press molding...
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[0051] Example 2:
[0052] Using an analytical balance, accurately weigh 385.1g of trimanganese tetroxide, 146.48g of nickel oxide, 499.30g of ferric oxide, and 500.31g of cobalt oxide. The above mixture was ball-milled and mixed for 20h, dried, crushed and calcined at 850℃ for 2h, and then again Ball mill for 20h to obtain traditional coarse particle powder (the particle size of the powder is 1-5μm). According to the same molar ratio of metal ions, nickel nitrate, manganese nitrate, ferric nitrate and cobalt nitrate were prepared into a 0.7mol / L aqueous solution, adjusted to pH=7 with ammonia water, ultrasonic spray drying was carried out under stirring, and then calcined at 500℃ for 4h to obtain Nano powder. Weigh 689g of this nano-powder and add it to the coarse-grained powder. Add deionized water while stirring. The added amount of water accounts for 25wt% of the mixed powder (ie, the above-mentioned nanopowder + coarse-grained powder). Press the mud in a filter press mold...
Example Embodiment
[0059] Example 3:
[0060] Using an analytical balance, accurately weigh 420.2g of trimanganese tetroxide, 487.04g of cobalt oxide, 499.30g of ferric oxide, and 40.40g of aluminum oxide. The above mixture was ball milled and mixed for 20h, dried, crushed and calcined at 1000℃ for 2h, and then again Ball mill for 20h to obtain traditional coarse-grained powder (the particle size of the powder is 1-5μm). According to the same molar ratio of metal ions, cobalt nitrate, manganese nitrate, iron nitrate and aluminum nitrate were prepared into a 0.7mol / L aqueous solution, adjusted to pH=7 with ammonia water, ultrasonic spray drying was carried out under stirring, and calcined at 500℃ for 4h to obtain Nano composite powder. Weigh 506.2g of this nano-powder and add it to the coarse-grained powder. Add deionized water while stirring. The added amount of water accounts for 25wt% of the mixed powder (ie the above-mentioned nano-powder + coarse-grained powder) . Press the mud in a filter...
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