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A novel ntc thermistor material based on nickel oxide

A thermistor and raw material technology, which is applied to resistors with negative temperature coefficients, resistors, non-adjustable metal resistors, etc., can solve the problems of structural relaxation, low volatilization temperature, volatilization of raw material components, etc. Simple, low sintering temperature and rich raw material effect

Inactive 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

On the one hand, in the temperature range above 200 ° C, the oxygen tetrahedron and oxygen octahedral interstitial cations in the crystal structure slowly redistribute over time, causing structural relaxation, and the aging phenomenon is serious, making the application range of this type of NTC ceramics It is limited within 200°C; on the other hand, when the material resistivity is high, its B value is also large, and vice versa, which makes it difficult to obtain high B value and low resistance characteristics of the material system with spinel structure
In addition, the volatilization temperature of these transition metal oxides is low, which makes it easy to volatilize the raw material components during the preparation and sintering of such NTC thermistor elements, and the final composition of the product, the consistency of the product and the difference between different batches of production Repeatability is difficult to control

Method used

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  • A novel ntc thermistor material based on nickel oxide
  • A novel ntc thermistor material based on nickel oxide
  • A novel ntc thermistor material based on nickel oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] This embodiment according to the molecular formula Ni 1-x-y Y x Mg y O is dosed, where x=0.01, y=0.01. The initial raw material is selected from basic nickel carbonate NiCO 3 2Ni(OH) 2 4H 2 O, Yttrium trioxide Y 2 o 3 , Magnesium oxide MgO. Materials were prepared according to the following experimental process steps:

[0021] (1) The initial raw material is Ni 0.98 Y 0.01 Mg 0.01 O formula ingredients, weigh NiCO 3 2Ni(OH) 2 4H 2 O30.7205g, Y 2 o 3 0.2823g, MgO 0.1007g;

[0022] (2) The raw materials taken in the previous step are dissolved in dilute nitric acid respectively;

[0023] (3) Mix the two solutions prepared in the previous step together, and use a magnetic stirring heater to stir and mix evenly, heat and dry;

[0024] (4) Calcining the powder obtained in the previous step at a temperature of 900° C. and keeping it warm for 2 hours;

[0025] (5) The powder synthesized in the previous step is granulated and pressed into a green body; the g...

Embodiment 2

[0031] This embodiment according to the molecular formula Ni 1-x-y Y x Mg y O was dosed, where x=0.02, y=0.01. The initial raw material is selected from basic nickel carbonate NiCO 3 2Ni(OH) 2 4H 2 O, Yttrium trioxide Y 2 o 3 , Magnesium oxide MgO. Materials were prepared according to the following experimental process steps:

[0032] (1) The initial raw material is Ni 0.97 Y 0.02 Mg 0.01 O formula ingredients, weigh NiCO 3 2Ni(OH) 2 4H 2 O30.4070g, Y 2 o 3 0.5646g, MgO 0.1007g;

[0033] (2) The preparation process is the same as steps (2)-(8) in Example 1.

[0034] The properties of the prepared materials are shown in Table 1. figure 1 and figure 2 shown.

Embodiment 3

[0036] This embodiment according to the molecular formula Ni 1-x-y Y x Mg y O was dosed where x=0.03, y=0.003. The initial raw material is selected from basic nickel carbonate NiCO 3 2Ni(OH) 2 4H 2 O, Yttrium trioxide Y 2 o 3 , Magnesium oxide MgO. Materials were prepared according to the following experimental process steps:

[0037] (1) The initial raw material is Ni 0.967 Y 0.03 Mg 0.003 O formula ingredients, weigh NiCO 3 2Ni(OH) 2 4H 2 O30.3130g, Y 2 o 3 0.8468g, MgO 0.0302g;

[0038] (2) The preparation process is the same as steps (2)-(8) in Example 1.

[0039] 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 semiconductor ceramic material, and especially relates to a thermistor material which can prepare a thermistor element with negative temperature coefficient (NTC) resistance. The NTC material employs NiO as a base of main compositions, room temperature resistance value and material constant value of the thermistor element are adjusted by adding a trace amount of doping elements. Simple oxides are used as main components in the NTC thermistor material; the material can be sintered into a ceramic body at 1100 DEG C, and is adapted to be sintered and moulded into temperature-sensitive ceramic elements, film temperature-sensitive elements, and low temperature co-sintered laminated temperature-sensitive elements. The thermistor material has the characteristics of good stability, good consistency, and good repeatability, and has adjustable room temperature resistance value, material constant, resistance temperature coefficient and other electrical characteristics; the thermistor material is suitable for temperature measurement, temperature control and line compensation, as well as protection of circuits and electronic components, and the fields of apparatus and application of measurements of flow velocity, flow, and ray.

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] Negative temperature coefficient (NTC) thermosensitive ceramics are materials whose resistance decreases exponentially with increasing temperature. NTC thermistor has the characteristics of high temperature measurement accuracy, good interchangeability and high reliability, and is widely used in temperature sensing and control of household appliances, vehicles and industrial production equipment. [0003] Among the many NTC material systems, the most common and most widely used are semiconductor thermosensitive ceramics prepared from two or more...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/01C04B35/622H01C7/04
CPCC04B35/01C04B35/622C04B2235/3206C04B2235/3225C04B2235/3279H01C7/043
Inventor 马志远李志成张鸿
Owner CENT SOUTH UNIV
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