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Method for producing medical high-precision negative temperature coefficient (NTC) thermosensitive resistors

A technology for thermistors and production methods, applied in the direction of resistors with negative temperature coefficients, etc., can solve problems such as limited temperature ranges, and achieve the effects of accurate temperature measurement, reduced test errors, and long service life

Active Publication Date: 2014-11-19
JURONG BOYUAN ELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the temperature control accuracy in the existing production methods generally reaches 0.3°C~1.5°C. Although the temperature control accuracy of some products can be controlled within 0.2°C, it is only limited to a single point or a narrow temperature range.

Method used

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  • Method for producing medical high-precision negative temperature coefficient (NTC) thermosensitive resistors
  • Method for producing medical high-precision negative temperature coefficient (NTC) thermosensitive resistors
  • Method for producing medical high-precision negative temperature coefficient (NTC) thermosensitive resistors

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Embodiment 1

[0024] Embodiment 1: a kind of production method of medical high-precision NTC thermistor, the method comprises the steps:

[0025] 1) Powder preparation: According to the target B value, prepare the powder according to a certain proportion; among them, the resistivity ρ is 10-20 (kΩ.mm), the material constant B is 2800-2900K, and the formula of the powder is: Mn 2 o 3 20%, Ni 2 o 3 50%, Fe 2 o 3 10%, CuO 15%, Al 2 o 3 1.5%, MgO 3.5%; the above are percentages by weight.

[0026] 2) Ball milling: Put the prepared powder into the rolling tank, add zirconium balls, and add a certain proportion of solvent twice to make a slurry; the solvent is ethanol, binder CK24, and dispersant, and the powder: The weight ratio of ethanol: binder: dispersant = 1: 0.35: 0.57: 0.06; the binder CK24 is a commercially available product; the dispersant is a commercially available model BYK110 dispersant, the main purpose of ball milling is to mix the powder Uniform and ground into nano p...

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Abstract

The invention discloses a method for producing medical high-precision negative temperature coefficient (NTC) thermosensitive resistors. The NTC thermosensitive resistors are prepared by the following steps of burdening, ball-milling, thin-strip isostatic pressing, flake sintering, ceramic chip silvering, silver firing, scribing, welding, encapsulation, curing, ripeness, testing and sorting in sequence. The high-precision NTC thermosensitive resistors can be widely applied to temperature measurement and control in medical treatment industry and have excellent consistency, repeatability and stability. A measuring range can be 0-+70 DEG C, and the measurement precision of each point can be controlled within a range of + / -0.2 DEG C so as to ensure the precision of each temperature measurement point. The high-precision NTC thermosensitive resistors have the advantages of being small in size, quick in response, vibration-resisting, long in service life, high in resistance value, large in slope of a temperature characteristic curve and the like. The high-precision NTC thermosensitive resistors are adopted in many high-precision electronic devices, can play a temperature measurement and control role accurately and effectively and enable the electronic devices to be stable and measure the temperature precisely so as to reduce testing errors.

Description

technical field [0001] The invention relates to the field of thermistors, in particular to a production method of medical high-precision NTC thermistors. Background technique [0002] At present, NTC (abbreviation of Negative Temperature Coefficient, meaning negative temperature coefficient) thermistor is made of metal oxides such as manganese, cobalt, nickel and copper as the main materials, and is manufactured by ceramic technology. These metal oxide materials all have semiconductor properties, because they are completely similar to semiconductor materials such as germanium and silicon in terms of conductivity. When the temperature is low, the number of carriers (electrons and holes) in these oxide materials is small, so its resistance value is high; as the temperature increases, the number of carriers increases, so the resistance value decreases. The variation range of NTC thermistor at room temperature is 10Ω~1000000Ω, and the temperature coefficient is -2%~-6.5%. At pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/04
Inventor 刘刚王梅凤汤成平薛云峰唐敏
Owner JURONG BOYUAN ELECTRONICS
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