Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Thermistor based on high-entropy oxide, and preparation method thereof

A thermistor and oxide technology, which is applied to resistors with negative temperature coefficients, resistors, non-adjustable metal resistors, etc., can solve problems such as affecting the stability of thermistors

Inactive Publication Date: 2021-05-14
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
View PDF3 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although process optimization can significantly improve the density of thermally sensitive materials, the spatially ordered arrangement of cations in the spinel structure makes it metastable under long-term placement or thermal stress, which affects the thermal resistance of thermistors. stability
No spinel phase (CoMnNiFeZn) has been retrieved so far 3 o 4 High-entropy oxide materials and related reports in the field of NTC oxide thermistors

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] a. According to Co:Mn:Fe:Ni:Zn=1:1:1:1:1, accurately weigh trimanganese tetraoxide, tricobalt tetraoxide, nickel oxide, ferric oxide and zinc oxide, put them into a ball mill jar, add Deionized water and absolute ethanol with a solvent volume ratio of 1:1, the ball mill jar is placed in a planetary ball mill, and ground for 10 hours to obtain a mixture;

[0023] b. Dry the mixture in step a in an oven at a temperature of 85°C, and then keep it at a constant temperature of 1000°C for 20 hours to melt it into a high-entropy oxide material with a single spinel structure;

[0024] c. Grinding the high-entropy oxide powder material obtained in step b for a second time in a planetary ball mill for 10 hours, and drying to obtain a powder;

[0025] d. The powder obtained in step c is pre-pressed and then isostatically pressed, and the pressure is controlled at 350Mpa and kept for 5 minutes;

[0026] e. Sinter the isostatically pressed block obtained in step d at a temperature ...

Embodiment 2

[0029] a. According to Co:Mn:Fe:Ni:Zn=1:1:1:1:1, accurately weigh the five oxides of trimanganese tetraoxide, tricobalt tetraoxide, nickel oxide, ferric oxide and zinc oxide, and put them into the ball mill In the tank, add deionized water and absolute ethanol with a solvent volume ratio of 1:1, place the ball milling tank in a planetary ball mill, and grind for 10 hours to obtain a mixture;

[0030] b. Dry the mixture in step a in an oven at a temperature of 85°C, and then keep it at a constant temperature of 1100°C for 15 hours to melt it into a high-entropy oxide material with a single spinel structure;

[0031] c. Grinding the high-entropy oxide powder material obtained in step b for a second time in a planetary ball mill for 10 hours, and drying to obtain a powder;

[0032] d. The powder obtained in step c is pre-pressed and then isostatically pressed, and the pressure is controlled at 350Mpa and kept for 5 minutes;

[0033] e. Sinter the isostatically pressed block obta...

Embodiment 3

[0036] a. According to Co:Mn:Fe:Ni:Zn=1:1:1:1:1, accurately weigh the five oxides of trimanganese tetraoxide, tricobalt tetraoxide, nickel oxide, ferric oxide and zinc oxide, and put them into the ball mill In the tank, add deionized water and absolute ethanol with a solvent volume ratio of 1:1, place the ball milling tank in a planetary ball mill, and grind for 10 hours to obtain a mixture;

[0037] b. Dry the mixture in step a in an oven at a temperature of 85°C, and then keep it at a constant temperature of 1150°C for 10 hours to melt it into a high-entropy oxide material with a single spinel structure;

[0038] c. Grinding the high-entropy oxide powder material obtained in step b for a second time in a planetary ball mill for 10 hours, and drying to obtain a powder;

[0039] d. The powder obtained in step c is pre-pressed and then isostatically pressed, and the pressure is controlled at 350Mpa and kept for 5 minutes;

[0040] e. Sinter the isostatically pressed block obta...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention relates to a thermistor based on a high-entropy oxide, and a preparation method thereof. The thermistor is composed of oxides of five elements of cobalt, manganese, nickel, iron and zinc, a single spinel phase high-entropy oxide powder material is prepared through a high-temperature solid-phase chemical reaction, and then the powder is subjected to pre-pressing forming, isostatic pressing, sintering, slicing, heat treatment, electrode manufacturing, scribing and packaging to form the NTC thermistor. The resistance value (25 DEG C) of the NTC thermistor is 6.5-12 K omega.cm, the material constant B value is 3500-3800 K, the material constant B value and the resistance value are high in consistency and good in interchangeability, after the NTC thermistor is aged for 1000 h at the temperature of 125 DEG C, the resistance drift rate is smaller than 0.05%, the stability of the NTC thermistor can be greatly improved, and the thermistor can be applied to seawater temperature measurement and control for a long time.

Description

technical field [0001] The invention relates to a high-entropy oxide-based thermistor and a preparation method thereof, in particular to applying high-entropy oxides to the field of negative temperature coefficient thermistors. Background technique [0002] The negative temperature coefficient thermistor is a sensor resistor whose resistance decreases exponentially with the increase of temperature within the working temperature range. It has a large application market in home appliances, automobiles, marine and other application fields, but with the development of market demand, higher requirements are put forward for the performance of thermistors, not only need to have a suitable resistance value and material constant B value, It also needs to have high long-term stability, so that its temperature-sensitive characteristics remain unchanged in the working environment, and it does not drift with the increase of thermal stress or use time, that is, it is not easy to age. Alt...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/04
CPCH01C7/046
Inventor 王军华姚金城王兵孔雯雯常爱民
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com