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High-temperature-resistant negative temperature coefficient thermistor and manufacturing method thereof

A technology of negative temperature coefficient and thermistor, applied in the direction of resistors with negative temperature coefficient, resistance manufacturing, resistors, etc., can solve problems such as unreliable use, and achieve improved reliability, enhanced reliability, high use The effect of temperature

Active Publication Date: 2020-04-07
NANJING SHIHENG ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The conventional negative temperature coefficient thermistor (NTC) is formed by tape casting or dry pressing, and two or more transition metal oxides such as cobalt oxide, manganese oxide, nickel oxide, iron oxide, copper oxide and aluminum oxide Doped with transition metal oxides, made into slurry or powder, formed, sintered, and made into electrodes to make NTC thermistor chips, and then made into NTC thermistors by welding, encapsulation or glass encapsulation. In the temperature range of -50-350°C, NTC thermistors have been widely used, but over 350°C, this type of NTC thermistor cannot be used reliably

Method used

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  • High-temperature-resistant negative temperature coefficient thermistor and manufacturing method thereof
  • High-temperature-resistant negative temperature coefficient thermistor and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Prepare the material according to the molar ratio Mn:Ni:Al=40:50:10, and then feed the material into the planetary ball mill for grinding with the mass ratio of material:ball:water=1:4:0.9, and the speed V=200~220 rpm, Forward and reverse every 30 minutes, grind for 8 hours and discharge. Pour the slurry into a stainless steel tray and place it in an oven for 12±1 hours at a temperature of 80°C±10°C. Pass the dried powder through a 20-mesh stainless steel sieve, crush it, pour it into a high-temperature-resistant porcelain dish, and put it in a pre-fired furnace for pre-fired. , to be naturally cooled to 40 ℃ ~ 60 ℃ out. Grind the above-mentioned pre-fired powder for the second time again, the grinding method is the same as the first grinding method, and do not discharge the material after grinding. Add polyvinyl alcohol binder and 0.3% polyacrylamide dispersant according to 2% of the weight of the original powder, and then grind for 30 minutes and discharge to make a...

Embodiment 2-3

[0049] The slurry was prepared in the same manner as in Example 1, except that the water in the grinding was replaced by 5% and 20% ethanol aqueous solutions, respectively.

Embodiment 4-6

[0051] The slurry was prepared in the same manner as in Examples 1 to 3, except that no polyvinyl alcohol was added after the secondary grinding, or 1% polyvinyl alcohol was added based on the weight of the dry polyvinyl alcohol powder in the slurry.

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PUM

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Abstract

The invention discloses a high-temperature-resistant negative temperature coefficient thermistor and a manufacturing method thereof. The high-temperature-resistant negative temperature coefficient thermistor comprises a chip, a high-temperature ceramic sleeve, a glaze water sealing layer and a lead; the chip is filled in the high-temperature ceramic sleeve, the lead is directly embedded in the chip, the lead is in direct contact with a chip material, and the ceramic sleeve and the outside of the chip are integrally sealed by the glaze water sealing layer. According to the invention, the high-temperature durable thermistor element disclosed by the invention has the effects of explosion prevention, water prevention, corrosion resistance and the like, and can be used in an environment with the temperature of 900 DEG C.

Description

technical field [0001] The invention belongs to the field of manufacturing electronic components, and in particular relates to a high-temperature-resistant negative temperature coefficient thermistor and a manufacturing method thereof. Background technique [0002] The conventional negative temperature coefficient thermistor (NTC) is formed by tape casting or dry pressing, and two or more transition metal oxides such as cobalt oxide, manganese oxide, nickel oxide, iron oxide, copper oxide and aluminum oxide Doped with transition metal oxides, made into slurry or powder, formed, sintered, and made into electrodes to make NTC thermistor chips, and then made into NTC thermistors by welding, encapsulation or glass encapsulation. In the temperature range of -50-350°C, NTC thermistors have been widely used, but over 350°C, this type of NTC thermistor cannot be used reliably. Contents of the invention [0003] In view of the defects of thermistor elements in the prior art, the i...

Claims

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Application Information

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IPC IPC(8): H01C1/02H01C7/04H01C17/00H01C17/02C03C8/00
CPCC03C8/00H01C1/02H01C7/04H01C17/00H01C17/02
Inventor 汪雪婷
Owner NANJING SHIHENG ELECTRONICS
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