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A lithium-containing six-element system medium temperature negative temperature coefficient thermistor material

A temperature coefficient, thermistor technology, applied in the direction of resistors with negative temperature coefficient, can solve the problems of restricting the application and promotion of traditional thermistor materials, achieve excellent B value, widen application fields, and overcome performance defects. Effect

Active Publication Date: 2020-08-14
CHENGDU DELANT ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practical applications, it often happens that one of the capacitance value and the resistance value meets the conditions of use, but the other parameter cannot meet the conditions, which greatly limits the application and promotion of traditional thermistor materials.

Method used

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  • A lithium-containing six-element system medium temperature negative temperature coefficient thermistor material
  • A lithium-containing six-element system medium temperature negative temperature coefficient thermistor material
  • A lithium-containing six-element system medium temperature negative temperature coefficient thermistor material

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A lithium-containing six-element system medium-temperature negative temperature coefficient thermistor material, the material is based on the molar ratio of six-element metal elements: Mn: Ni: Co: Fe: Al: Li = 55: 12: 18: 10: 4: 1 Manganese, cobalt, nickel, iron, aluminum and lithium six-membered oxides were designed and prepared by conventional preparation methods for thermistor materials.

Embodiment 2

[0038] A lithium-containing six-element medium-temperature negative temperature coefficient thermistor material, which is designed according to the molar ratio of six-element metal elements: Mn: Ni: Co: Fe: Al: Li = 50: 15: 15: 12: 5: 3 , and the hexavalent oxides of manganese, cobalt, nickel, iron, aluminum and lithium prepared according to the following method steps. The preparation method is:

[0039] a. Weigh Mn respectively according to the molar ratio 3 o 4 、Co 3 o 4 、Ni 2 o 3 , Fe 2 o 3 、Al 2 o 3 , Li 2 CO 3 The powders are mixed to obtain a mixed powder;

[0040] b. Alcohol is used as the dispersion solvent, and zirconia balls with a diameter of 3-5 mm are used as grinding balls. According to the weight ratio: mixed powder: zirconia balls: alcohol = 1:4:1, after fully mixing, put it in a ball mill and mill it 8-10h, so that the mixed powder is further refined into slurry;

[0041] c. Take out the slurry obtained in step b, dry it at a temperature of 100-1...

Embodiment 3

[0043] A lithium-containing six-element medium-temperature negative temperature coefficient thermistor material, which is designed according to the molar ratio of six-element metal elements: Mn: Ni: Co: Fe: Al: Li = 52: 13: 15: 10: 6: 4 , and the six-membered oxide of manganese, cobalt, nickel, iron, aluminum and lithium prepared according to the preparation method in Example 2.

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Abstract

The invention discloses a lithium containing six-component medium-temperature thermistor material with a negative temperature coefficient. The thermistor material is oxides of manganese, cobalt, nickel, iron, aluminum, and lithium; wherein the mole rate of Mn: Ni: Co: Fe: Al: Li is 50-80: 10-20: 18-10: 10-5: 2-8: 1-5. The provided thermistor material has a stable high B value and medium resistancein a medium temperature range (300-500 DEG C); the shortage that a conventional NTC thermistor material cannot satisfy the requirements on resistance and B value at the same time is overcome; the application range of NTC thermistor materials is greatly enlarged, and the thermistor material can be used to prepare temperature sensors and temperature sensitive alarm devices, which are used at mediumtemperatures, and has a high industrial value.

Description

technical field [0001] The invention relates to the field of negative temperature coefficient thermistor materials, in particular to a new lithium-containing six-element coefficient negative temperature coefficient thermistor material used at medium temperature (300-500°C). Background technique [0002] Negative temperature coefficient thermistor material, also known as NTC thermistor material, is a kind of sensor resistance material whose resistance decreases with the increase of temperature, and is widely used in the fields of industrial production, scientific research, aviation and military equipment in China. However, in actual use, for different application temperatures, different use circuits, etc., the negative temperature coefficient (NTC) thermistor needs to have different standard resistance (25°C resistance) and material constant (B value). Usually, traditional NTC thermistor ceramic materials are generally composed of oxides of transition metals such as manganese...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/01C04B35/622C04B41/88H01C7/04
CPCC04B35/01C04B35/622C04B41/009C04B41/51C04B41/88C04B2235/3203C04B2235/3217C04B2235/3272C04B2235/3277C04B2235/3279H01C7/04
Inventor 康雪雅
Owner CHENGDU DELANT ELECTRONICS TECH
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