A kind of negative temperature coefficient thermistor material and preparation method thereof

A negative temperature coefficient, thermistor technology, applied in the direction of resistors with negative temperature coefficient, etc., can solve the problems of limiting the application of spinel thermistors, low room temperature resistivity of thermistors, and low room temperature resistivity , to achieve good NTC characteristics, wide temperature range and stable chemical properties

Inactive Publication Date: 2016-01-20
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the interstitial ions of oxygen tetrahedron and oxygen octahedron in spinel-structured thermistor materials will slowly redistribute over time in an environment above 200 °C, resulting in irreversible drift of material resistivity and severe aging of the material. Limits the application of spinel thermistor in high temperature field
In addition, the material constant and room temperature resistivity of spinel thermistors are low. Usually, the material constant B value is lower than 5000K, and the room temperature resistivity is lower than 1.0E+5Ω.cm

Method used

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  • A kind of negative temperature coefficient thermistor material and preparation method thereof
  • A kind of negative temperature coefficient thermistor material and preparation method thereof
  • A kind of negative temperature coefficient thermistor material and preparation method thereof

Examples

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Embodiment 1

[0024] Preparation of Negative Temperature Coefficient Thermistor Material Ce 0.9 mn 0.9 Si 0.1 o 3.8 (x=0.9). The preparation method is: weigh the analytically pure CeO according to the stoichiometric ratio 2 , MnO 2 and SiO 2 , mix, add deionized water ball mill for 4 hours, dry at 90°C for 12 hours; pre-burn at 980°C for 3 hours, ball mill and dry again, add 8wt% PVA with a concentration of 5mol% and mix evenly, pass through an 80-mesh sieve to make Granules, dry-pressed at 180Mpa; sintered at 1180°C for 3 hours, and cooled with the furnace to obtain a negative temperature coefficient thermistor material.

[0025] Carry out XRD test to the material that makes, the result is as follows figure 2 As shown, the material has CeO 2 The two main crystal phases of MnO and MnO, the interdiffusion between the composite phase components makes their properties compensate each other, which can improve the high temperature stability of the material. CeO 2 The strength of the p...

Embodiment 2

[0027] Preparation of Negative Temperature Coefficient Thermistor Material Ce 0.8 mn 0.8 Si 0.2 o 3.6 (x=0.8). The preparation method is: weigh the analytically pure CeO according to the stoichiometric ratio 2 , MnO 2 and SiO 2 , mix, add deionized water ball mill for 4 hours, dry at 90°C for 12 hours; pre-burn at 980°C for 3 hours, ball mill and dry again, add 8wt% PVA with a concentration of 5mol% and mix evenly, pass through an 80-mesh sieve to make Granules, dry-pressed at 180Mpa; sintered at 1170°C for 3 hours, and cooled with the furnace to obtain a negative temperature coefficient thermistor material.

Embodiment 3

[0029] Preparation of Negative Temperature Coefficient Thermistor Material Ce 0.7 mn 0.7 Si 0.3 o 3.4 (x=0.7). The preparation method is: weigh the analytically pure CeO according to the stoichiometric ratio 2 , MnO 2 and SiO 2 , mix, add deionized water ball mill for 4 hours, dry at 90°C for 12 hours; pre-burn at 980°C for 3 hours, ball mill and dry again, add 8wt% PVA with a concentration of 5mol% and mix evenly, pass through an 80-mesh sieve to make Granules, dry-pressed at 180Mpa; sintered at 1160°C for 3 hours, and cooled with the furnace to obtain a negative temperature coefficient thermistor material.

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Abstract

The invention discloses a negative temperature coefficient thermistor material and a preparation method thereof. A general formula of the thermistor material is CexMnxSi1-xO2x+2, wherein x is more than 0.65 and less than 1; and constants of the thermistor material are as follows: B100 DEG C / 200 DEG C is (5400-5880)K+ / -10%, specific resistance Rho25 DEG C is (3.6-97)*10<5>Omega.cm + / -10%, and Rho250 DEG C is (250-8000)Omega.cm + / -10%. A resistance temperature curve of the thermistor material has good linearity in the whole temperature test interval and stable high temperature performance and is wide in application temperature range, and specific resistance at room temperature of the thermistor material can be continuously regulated by adjusting the content of Si in a system.

Description

technical field [0001] The invention belongs to the technical field of thermosensitive materials, and more specifically relates to a negative temperature coefficient thermistor material and a preparation method thereof. Background technique [0002] The negative temperature coefficient (NegativeTemperatureCoefficient, NTC) thermistor material is a material whose resistance decreases with the increase of temperature. Due to its small size, simple preparation method, fast response, high sensitivity, and low price, it is widely used in the fields of temperature measurement, temperature control, and temperature compensation. [0003] NTC thermistor materials currently used in industrial production mainly use two or more transition metal oxides such as Mn, Co, Ni, Fe, and Cu as raw materials, and the main crystal phase of the obtained thermistor material is sharp. Crystal structure. However, the interstitial ions of oxygen tetrahedron and oxygen octahedron in spinel-structured ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/50C04B35/622H01C7/04
Inventor 郝永德邓彦彦关卡周乐归
Owner HUAZHONG UNIV OF SCI & TECH
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