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Lithium-iron-doped nickel oxide negative temperature coefficient (NTC) thermistor material

A technology of negative temperature coefficient and thermistor, applied in the direction of resistors with negative temperature coefficient, resistors, non-adjustable metal resistors, etc., can solve the problems of structural relaxation, material aging, poor product consistency, etc., and achieve material The composition is simple, the sintering temperature is low, and the performance is stable and high

Active Publication Date: 2016-09-28
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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  • Lithium-iron-doped nickel oxide negative temperature coefficient (NTC) thermistor material
  • Lithium-iron-doped nickel oxide negative temperature coefficient (NTC) thermistor material
  • Lithium-iron-doped nickel oxide negative temperature coefficient (NTC) thermistor material

Examples

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Embodiment 1

[0019] According to the molecular formula Ni in this embodiment 1-x-y Li x Fe y O is batching, where x=0.04 and 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 . The material preparation is carried out according to the following experimental process steps:

[0020] (1) Press 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) Dissolve the raw materials weighed in the previous step in dilute nitric acid;

[0022] (3) Use a magnetic stirring heater to stir and mix the solution prepared in the previous step, and heat to dry;

[0023] (4) Calcining the powder obtained in the previous step at a temperature of 850°C and holding it 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 with a diameter of 15 mm and a thickness of 3.5 to 4.0 mm;

[0025] (6) Sintering the gr...

Embodiment 2

[0030] According to the molecular formula Ni in this embodiment 1-x-y Li x Fe y O batching, where x=0.04 and 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 , Iron citrate-hydrated FeC 6 H 5 O 7 ·NH 2 O. The material preparation is carried out according to the following experimental process steps:

[0031] (1) Press 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 weighed in the previous step 3 ·2Ni(OH) 2 ·4H 2 O and Li 2 CO 3 Dissolved in dilute nitric acid; FeC 6 H 5 O 7 ·NH 2 O is dissolved in deionized water by heating.

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

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

[0035] The properties of the pr...

Embodiment 3

[0037] This example is based on the molecular formula Ni 1-x-y Li x Fe y O batching, where x=0.04 and y=0.04. The initial raw material is NiCO basic nickel carbonate 3 ·2Ni(OH) 2 ·4H 2 O, lithium carbonate Li 2 CO 3 , Iron citrate-hydrated FeC 6 H 5 O 7 ·NH 2 O. The material preparation is carried out according to the following experimental process steps:

[0038] (1) Press 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 the steps (2) to (4) in Example 2.

[0040] The properties of the prepared materials are shown in Table 1, figure 1 with 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. It is suitable for temperature measurement, temperature control and circuit compensation, as well as the protection of circuits and electronic components, as well as instruments and applications for flow rate, flow, and radiation measurement. Background technique [0002] Thermistor is a device made of the characteristics of material resistivity changing with temperature, including positive temperature coefficient thermistor (PTC) and negative temperature coefficient thermistor (NTC). NTC thermosensitive materials generally refer to semiconductor materials or components that have the characteristics of decreasing resistance with increasing temperature. They are now widely used in temperature measurement, control, temperature compensation, and protection of circuits and electronic components, as well as fl...

Claims

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Application Information

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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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