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A lithium-iron-doped nickel oxide negative temperature coefficient thermistor material

A technology of negative temperature coefficient and thermistor, which is applied in the direction of resistors with negative temperature coefficient, resistors, non-adjustable metal resistors, etc., can solve problems such as structural relaxation, material aging, and composition affecting accuracy, and achieve material The effect of simple composition, high performance stability and low sintering temperature

Active Publication Date: 2020-01-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, spinel-structure NTC thermistor materials made of traditional transition metal oxides of manganese, nickel, cobalt, iron, and copper have many shortcomings. For example, the volatilization temperature of transition metal oxides is low. This type of NTC The thermistor element will produce volatilization of raw materials during the preparation process, which will affect the performance and uniformity of the product; long-term use will cause volatilization of components, which will affect the precision; the product consistency will be poor during the production process; the resistance value, temperature coefficient and material coefficient of the material It is difficult to control and adjust; it is easy to cause structural relaxation and cause material aging, etc.

Method used

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  • A lithium-iron-doped nickel oxide negative temperature coefficient thermistor material
  • A lithium-iron-doped nickel oxide negative temperature coefficient thermistor material
  • A lithium-iron-doped nickel oxide negative temperature coefficient thermistor material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] This embodiment according to the molecular formula Ni 1-x-y Li x Fe y O was dosed where x=0.04, y=0. The initial raw material is selected from basic nickel carbonate NiCO 3 2Ni(OH) 2 4H 2 O, lithium carbonate Li 2 CO 3 . Materials were prepared according to the following experimental process steps:

[0020] (1) The initial raw material is Ni 0.96 Li 0.04 O formula ingredients, weigh NiCO 3 2Ni(OH) 2 4H 2 O 24.0787g, Li 2 CO 3 0.2956g;

[0021] (2) the raw material taken in the previous step is dissolved in dilute nitric acid;

[0022] (3) The solution prepared in the previous step is stirred and mixed evenly with a magnetic stirring heater, heated and dried;

[0023] (4) Calcining the powder obtained in the previous step at a temperature of 850° C. and keeping it warm for 5 hours;

[0024] (5) The powder synthesized in the previous step is granulated and pressed into a green body; the green body is a disc shape, the diameter of the disc is 15 mm, and ...

Embodiment 2

[0030] This embodiment according to the molecular formula Ni 1-x-y Li x Fe y O was dosed where x=0.04, y=0.03. The initial raw material is selected from basic nickel carbonate NiCO 3 2Ni(OH) 2 4H 2 O, lithium carbonate Li 2 CO 3 , ferric citrate-hydrated FeC 6 h 5 o 7 ·nH 2 O. Materials were prepared according to the following experimental process steps:

[0031] (1) The initial raw material is Ni 0.93 Li 0.04 Fe 0.03 O formula ingredients, weigh NiCO 3 2Ni(OH) 2 4H 2 O23.3262g, Li 2 CO 3 0.2956g, FeC 6 h 5 o 7 ·nH 2 O 1.4698g;

[0032] (2) The raw material NiCO taken in the previous step 3 2Ni(OH) 2 4H 2 O and Li 2 CO 3 Soluble in dilute nitric acid; FeC 6 h 5 o 7 ·nH 2 O is heated and dissolved in deionized water.

[0033] (3) Mix the two solutions prepared in the previous step together, stir and mix evenly with a magnetic stirring heater, and heat and dry.

[0034] (4) The preparation process is the same as steps (4)-(8) in Example 1.

...

Embodiment 3

[0037] This example according to molecular formula Ni 1-x-y Li x Fe y O was dosed where x=0.04, y=0.04. Basic nickel carbonate NiCO is selected as the initial raw material 3 2Ni(OH) 2 4H 2 O, lithium carbonate Li 2 CO 3 , ferric citrate-hydrated FeC 6 h 5 o 7 ·nH 2 O. Materials were prepared according to the following experimental process steps:

[0038] (1) The initial raw material is Ni 1-x-y Li x Fe y O formula ingredients, weigh NiCO 3 2Ni(OH) 2 4H 2 O23.0754g, Li 2 CO 3 0.2956g, FeC 6 h 5 o 7 ·nH 2 O 1.9596g;

[0039] (2) The preparation process is the same as steps (2)-(4) in Example 2.

[0040] The properties of the prepared materials are shown in Table 1. figure 1 and figure 2 shown.

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Abstract

The invention relates to a semiconductive ceramic material and especially relates to a negative temperature coefficient (NTC) thermistor material. The material can adjust a room temperature resistance value and a material constant value of a thermistor element through change of doped microelement content. The NTC thermistor material mainly comprises a simple oxide, can be sintered to form ceramic at a temperature of about 1200 DEG C and is suitable for sintering molding of a thermal sensitive ceramic element, a film thermal sensitive element and a low temperature co-fired laminated heat sensitive component. The heat sensitive thermistor material has the characteristics of good stability, good consistency and good repeatability, has controllability of electric characteristics such as a resistance value, a material constant and a resistance temperature coefficient, is suitable for temperature measurement, temperature control and line compensation and can be used in the field of circuit and electronic component protection and flow velocity, flow and ray measurement apparatus and application.

Description

technical field [0001] The invention relates to an NTC thermistor material for preparing a thermistor element with a negative temperature coefficient (NTC) effect of resistance. Applicable to temperature measurement, temperature control and line compensation, as well as protection of circuits and electronic components, as well as instruments and applications for flow velocity, flow, and ray measurement. Background technique [0002] Thermal sensors are devices made using the characteristics of material resistivity changing with temperature, including positive temperature coefficient thermistors (PTC) and negative temperature coefficient thermistors (NTC). NTC heat-sensitive materials generally refer to semiconductor materials or components that have the characteristic that the resistance value decreases with the increase of temperature, and have been widely used in temperature measurement, control, temperature compensation, protection of circuits and electronic components, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/01C04B35/26C04B35/622H01C7/04
CPCC04B35/01C04B35/2616C04B35/622C04B2235/3203C04B2235/3272C04B2235/3279H01C7/046
Inventor 王佳希李志成张鸿
Owner CENT SOUTH UNIV
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