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Preparation method of high-temperature negative temperature coefficient thermistor material

A negative temperature coefficient, thermistor technology, applied in the direction of resistors, resistors, non-adjustable metal resistors with negative temperature coefficients, etc., can solve problems such as rearrangement and poor stability

Inactive Publication Date: 2020-09-01
东阳市聚冉电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Most of the negative temperature coefficient thermistor materials prepared by the above inventions and existing patents are negative temperature coefficient thermistor materials with a spinel structure. This material is very prone to serious rearrangement when it is higher than 300 ° C. Extremely poor, which limits the application of negative temperature coefficient thermistor materials in automotive exhaust temperature control, petroleum and geological drilling and other fields

Method used

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  • Preparation method of high-temperature negative temperature coefficient thermistor material
  • Preparation method of high-temperature negative temperature coefficient thermistor material
  • Preparation method of high-temperature negative temperature coefficient thermistor material

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A method for preparing a high-temperature negative temperature coefficient thermistor material, the operation steps of which are:

[0035] Put 15g of metal-doped spherical ceria nanopowder, 24g of manganese dioxide powder, 3g of silica nanoparticle and 120g of water into the ball mill jar, then ball mill for 2 hours, and dry the obtained slurry at 80°C Dry, pulverized, and calcined in a muffle furnace at a temperature of 900°C for 1 hour. After cooling, add 2g of graphene-modified MQ resin, mix evenly and granulate, and then dry-form under a pressure of 150MPa to make a diameter of 5mm and a thickness of 0.5mm. mm thick disc, then calcined at 500°C for 1 hour, and then heated to 1100°C for 4 hours. After the completion, the obtained ceramic sheet was polished smooth, cleaned and printed with silver paste, dried and kept at 800°C for 10 minutes, and cooled. A high temperature negative temperature coefficient thermistor material can be obtained.

[0036] The metal-doped ...

Embodiment 2

[0045] A method for preparing a high-temperature negative temperature coefficient thermistor material, the operation steps of which are:

[0046] Put 23g of metal-doped spherical ceria nanopowder, 31g of manganese dioxide powder, 5g of silica nanoparticle and 150g of water into the ball mill jar, then ball mill for 5h, and dry the obtained slurry at 100°C Dry, pulverize and calcinate in a muffle furnace at 950°C for 3 hours, add 6g of graphene-modified MQ resin after cooling, mix well and granulate, then dry-form under a pressure of 210MPa to make a diameter of 7mm and a thickness of 1mm Thick discs are then calcined at 550°C for 2 hours, and then heated to 1150°C for 6 hours. After the completion, the obtained ceramic sheets are polished smooth, cleaned and printed with silver paste, dried and kept at 830°C for 20 minutes. After cooling, the A high temperature negative temperature coefficient thermistor material can be obtained.

[0047] The metal-doped spherical ceria nanop...

Embodiment 3

[0056] A method for preparing a high-temperature negative temperature coefficient thermistor material, the operation steps of which are:

[0057] Add 34g of metal-doped spherical ceria nanopowder, 38g of manganese dioxide powder, 8g of silica nanoparticle and 180g of water into the ball mill jar, then ball mill for 8 hours, and dry the obtained slurry at 120°C Dry, crushed and calcined in a muffle furnace at a temperature of 1000°C for 5 hours. After cooling, add 8g of graphene-modified MQ resin, mix well and granulate, and then dry-form under a pressure of 260MPa to make a diameter of 10mm and a thickness of 2mm. Thick discs are then calcined at 600°C for 3 hours, and then heated to 1200°C for 8 hours. After the completion, the obtained ceramic sheets are polished smooth, cleaned and printed with silver paste, dried and kept at 860°C for 30 minutes. After cooling, the A high temperature negative temperature coefficient thermistor material can be obtained.

[0058] The metal-...

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Abstract

The invention relates to the field of preparation of thermistor materials,, and especially relates to a preparation method of a high-temperature negative temperature coefficient thermistor material. The invention discloses a preparation method of a high-temperature negative temperature coefficient thermistor material. a metal-doped spherical cerium dioxide nano powder material is combined with nano manganese dioxide powder and silicon dioxide nanoparticles; the negative temperature coefficient thermistor material is prepared by adopting a solid-phase synthesis method, and the material has stable high-temperature physical, chemical and electrical properties, and particularly has small change of resistance to high-temperature direct-current load along with time. The material has no phase change in a use range; the material has the characteristics of wide applicable temperature range, proper sensitivity under a high-temperature condition, controllable room-temperature resistivity and material constant and low high-temperature aging coefficient.

Description

technical field [0001] The invention relates to the field of thermistor material preparation, in particular to a method for preparing a high-temperature negative temperature coefficient thermistor material. Background technique [0002] Negative temperature coefficient thermistor, also known as NTC thermistor, is a kind of sensor resistance whose resistance value decreases with the increase of temperature. Widely used in various electronic components, such as temperature sensors, resettable fuses and self-adjusting heaters, etc. [0003] 201910235582.4 involves a material suitable for preparing a thermistor with a negative temperature coefficient of resistance (NTC). The NTC thermistor material of the present invention is mainly composed of zinc oxide, and the purpose of adjusting the room temperature resistivity and material constant B value of the thermistor element is achieved by changing the content of each element in the composition, and a wide range of room temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/01C04B35/634C04B35/626H01C7/04C04B41/88C08F292/00C08F283/12C08F220/06
CPCC04B35/013C04B35/62645C04B35/6344C04B41/009C04B41/5116C04B41/88C04B2235/3229C04B2235/3267C04B2235/3418C04B2235/425C04B2235/443C04B2235/483C04B2235/96C08F283/124C08F292/00H01C7/043C04B41/4539C04B41/4501C08F220/06
Inventor 斯惠仙张义忠吴尤嘉
Owner 东阳市聚冉电子科技有限公司
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