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NTC thermosensitive resistor and manufacturing method thereof

A thermistor, the main component technology, applied in the direction of resistors, resistors, non-adjustable metal resistors, etc., can solve the problems of reducing the reliability of thermistors, large changes in the resistance value of the device, easy to break, etc.

Active Publication Date: 2021-02-23
SHENZHEN SUNLORD ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because during the aging process of Cu-containing thermistors, Cu elements are easily released from Cu + is oxidized to Cu 2+ , leading to a large change in the resistance value of the device
At the same time, the strength of the ceramic body of the thermistor material containing Cu is low after sintering, and it is easy to break during use, which will reduce the reliability of the thermistor containing Cu.

Method used

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  • NTC thermosensitive resistor and manufacturing method thereof
  • NTC thermosensitive resistor and manufacturing method thereof
  • NTC thermosensitive resistor and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063]A high-reliability, low-resistance, high-B value NTC thermistor, the main component of its ceramic material includes: 50% Mn3O4, 40% Co3O4, 8% Fe2O3, 2% CuO, additives include: 1% SiO2, 0.5% ZrO2; The particle size of each oxide is 0.3μm-0.7μm.

[0064]A method for preparing a high-reliability, low-resistance, high-B value NTC thermistor includes the following steps:

[0065](1) Preparation of ceramic materials: weigh the oxides of the above ceramic materials and mix them by ball milling. The ball milling medium is zirconia balls and deionized water. The weight of the ceramic material: the weight of zirconia balls: the weight of deionized water = 1.1:2.5 :1.2 Perform ball milling and mixing, the ball milling time is 4h, and the ball milling speed is 260rpm for mixing. After drying, it is pre-fired at 900°C for 4 hours; then the ball mill is fine. The ball milling medium is deionized water and zirconia balls. The weight of the pre-fired powder: Zirconia ball weight: deionized water w...

Embodiment 2

[0071]A high-reliability, low-resistance, high-B value NTC thermistor, the main component of its ceramic material includes: 50% Mn3O4, 40% Co3O4, 8% Fe2O3, 2% CuO, additives include: 1% SiO2, 0.5% ZrO2; Wherein the particle size of each oxide is 0.3μm-0.7μm.

[0072]A method for preparing a high-reliability, low-resistance, high-B value NTC thermistor includes the following steps:

[0073](1) Preparation of ceramic materials: weigh the oxides of the above ceramic materials and mix them by ball milling. The ball milling medium is zirconia balls and deionized water. The weight of the ceramic material: the weight of zirconia balls: the weight of deionized water = 1.1:2.5 :1.2 Perform ball milling and mixing, the ball milling time is 4h, and the ball milling speed is 260rpm for mixing. After drying, it is pre-fired at 900°C for 4 hours; then the ball mill is fine. The ball milling medium is deionized water and zirconia balls. The weight of the pre-fired powder: Zirconia ball weight: deionized...

Embodiment 3

[0079]A high-reliability, low-resistance, high-B value NTC thermistor, the main component of its ceramic material includes: 50% Mn3O4, 40% Co3O4, 8% Fe2O3, 2% CuO, additives include: 1% SiO2, 0.5% ZrO2; Wherein the particle size of each oxide is 0.3μm-0.7μm.

[0080]A method for preparing a high-reliability, low-resistance, high-B value NTC thermistor includes the following steps:

[0081](1) Preparation of ceramic materials: weigh the oxides of the above ceramic materials and mix them by ball milling. The ball milling medium is zirconia balls and deionized water. The weight of the ceramic material: the weight of zirconia balls: the weight of deionized water = 1.1:2.5 :1.2 Perform ball milling and mixing, the ball milling time is 4h, and the ball milling speed is 260rpm for mixing. After drying, it is pre-fired at 900°C for 4 hours; then the ball mill is fine. The ball milling medium is deionized water and zirconia balls. The weight of the pre-fired powder: Zirconia ball weight: deionized...

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Abstract

The invention provides an NTC thermosensitive resistor and a manufacturing method thereof. The NTC thermosensitive resistor comprises a ceramic body, and the ceramic body comprises a ceramic materialmain component and an additive; the main components of the ceramic material comprise the following components in percentage by mass: 35%-50% of Mn3O4, 25%-40% of Co3O4, 10%-15% of Fe2O3 and 1%-3% of CuO. The additive comprises the following components in percentage by mass relative to the total mass of the main components: 1%-3% of SiO2 and 0.5%-1.5% of ZrO2. The NTC thermosensitive resistor manufactured on the basis of the ceramic material has the advantages of low resistance, high B value, good device electrical property consistency, high bending strength and aging value of less than 1%, thethermosensitive resistor R25 is 4 k[ohm]-12 k[ohm], and the material constant is 3900 K-4050 K.

Description

Technical field[0001]The invention relates to the technical field of NTC thermistors, in particular to a high-reliability, low-resistance, high-B value NTC thermistor and a manufacturing method thereof.Background technique[0002]NTC (Negative Temperature Coefficient abbreviation) Thermistor ceramic materials are generally composed of two or more transition metal oxides such as Mn, Co, Ni, Al, Fe, and Cu, which have a spinel structure synthesized at high temperatures. It is a characteristic material whose resistance value decreases with increasing temperature. This type of ceramic material is widely used in temperature detection, temperature compensation and surge current suppression due to its high sensitivity and high stability.[0003]Since single-layer thermistors do not have internal electrodes, their electrical properties can only be adjusted by material, product size and manufacturing process. Among them, the product size and manufacturing process have a limited adjustment range....

Claims

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Application Information

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IPC IPC(8): C04B35/36C04B35/622C04B35/626C04B35/632C04B35/634C04B35/64C04B41/86H01C7/04H01C17/30
CPCC04B35/265C04B35/622C04B35/6261C04B35/62645C04B35/632C04B35/63424C04B35/64C04B41/86C04B41/5022H01C7/043H01C17/30C04B2235/3263C04B2235/3277C04B2235/3281C04B2235/3244C04B2235/3418C04B2235/5445C04B2235/656C04B2235/6567C04B2235/96C04B41/4539C04B41/0072
Inventor 韩林材陆达富聂敏刘剑易新龙
Owner SHENZHEN SUNLORD ELECTRONICS
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