Thermosensitive ceramic powder, NTC thermosensitive chip, temperature sensor and preparation method

A technology of heat-sensitive ceramics and powders, applied to thermometers, thermometers, instruments, etc. that are directly sensitive to heat-sensitive electrical/magnetic components, can solve problems affecting the magnetism of the motor rotor, loss of magnetism, and high internal power of the motor, and achieve good performance. Good electrical performance, compactness, and high reliability

Active Publication Date: 2018-12-21
SHENZHEN HOVERBIRD ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The internal power of the motor caused by heat is too high, which will affect the magnetism of the motor rotor, and even lose the magnetism

Method used

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  • Thermosensitive ceramic powder, NTC thermosensitive chip, temperature sensor and preparation method
  • Thermosensitive ceramic powder, NTC thermosensitive chip, temperature sensor and preparation method
  • Thermosensitive ceramic powder, NTC thermosensitive chip, temperature sensor and preparation method

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Effect test

preparation example Construction

[0052] The preparation method of the NTC thermosensitive chip provided by the application, the steps are as follows:

[0053] Prepare a ceramic green sheet, and make a ceramic green sheet from a heat-sensitive ceramic slurry, the thickness of the ceramic green sheet is 0.1-0.6mm;

[0054] Preparation of ceramic green bodies, using warm isostatic pressing technology to press ceramic green bodies into ceramic green bodies;

[0055] Prepare an NTC thermal chip, print the electrode paste and glass protective glaze on the ceramic green body, and then sinter the printed ceramic green body into a whole in an inert gas atmosphere furnace to obtain NTC heat sensitive chip.

[0056] Wherein, the above-mentioned electrode paste adopts silver-coated palladium powder instead of silver powder as the conductive agent. Silver-coated palladium is a binary alloy in which silver is added as the base of palladium. Palladium and silver can be dissolved infinitely to form a continuous solid solut...

Embodiment

[0078] 1. Preparation of NTC Thermosensitive Chip

[0079] 1) By weight, according to the design formula, the thermistor components: manganese dioxide powder 35%, dicobalt oxide powder 16%, iron oxide powder 8.5%, nickel oxide powder 36% and rare earth oxide powder 4.5%, mixed Ball milling, drying at low temperature, calcining at high temperature, and crushing by ball milling to obtain heat-sensitive ceramic powder.

[0080] 2) By weight, heat-sensitive ceramic slurry is prepared according to the following proportions for each component: heat-sensitive ceramic powder 76% and organic solvent 10% (butyl carbitol 4%, amyl acetate 3%, isoamyl acetate ester 3%), adhesive polyvinyl butyral 9%, plasticizer dibutyl sebacate 4%, and federal B-329 1.0% in the surface additive are mixed, and the planetary ball mill is used for ball milling and sieving , to obtain heat-sensitive ceramic slurry after vacuum defoaming.

[0081] 3) Form the heat-sensitive ceramic slurry into ceramic green ...

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Abstract

The invention discloses thermosensitive ceramic powder, a NTC thermosensitive chip, a temperature sensor and a preparation method. The ceramic powder disclosed by the invention is prepared from the following components in percentage by weight: 18-38% of manganese dioxide powder, 12-20% of cobalt oxide powder, 4-14% of iron oxide powder, 21-41% of nickel oxide powder and 2-10% of rare earth oxide powder. The temperature sensor disclosed by the invention has the advantages of perfect softness, bending resistance, vibration resistance, wear resistance, corrosion resistance and the like, and is adapted to quite harsh environment of oil stain, EMI, mechanical pressure and the like in a motor; the temperature sensor is required to work stably for a long time in bad conditions.

Description

technical field [0001] The invention relates to the technical field of electronic components, in particular to a heat-sensitive ceramic powder, an NTC heat-sensitive chip, a temperature sensor and a preparation method. Background technique [0002] NTC (negative temperature coefficient) thermistor is a thermally sensitive semiconductor resistor composed of polycrystalline ceramics of mixed oxides. Its resistance value decreases with the increase of temperature. It has the advantages of low price, high quality and stable performance. It is widely used Used to prepare temperature sensors to measure temperature. [0003] In recent years, NTC temperature sensors have been more and more widely used in new energy vehicle battery packs, motors, electronic control, and thermal management systems. As the core component of the temperature sensor, the NTC thermal chip puts forward new requirements for the NTC thermal chip. In the harsh environment of continuous high temperature, high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/01C04B35/622C04B35/626C03C8/04C03C12/00C04B41/85G01K7/22
CPCC03C8/04C03C12/00C04B35/01C04B35/622C04B35/62605C04B41/5122C04B41/85C04B2235/3224C04B2235/3262C04B2235/3272C04B2235/3275C04B2235/6025C04B2235/6562C04B2235/6567G01K7/22C04B41/5116C04B41/5027C04B41/4535
Inventor 刘斌王田军杜野吴菲徐邦耿黄小华
Owner SHENZHEN HOVERBIRD ELECTRONICS TECH CO LTD
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