Medical gold-containing high-precision and high-stability ntc thermal chip and its manufacturing method

A high-stability and high-precision technology, used in thermometers, thermometers, and heat measurement using directly sensitive electrical/magnetic components. It can solve the problems of poor stability, low temperature measurement accuracy, and short service life. The effect of prolonging life, improving resistance value accuracy, improving accuracy and stability

Active Publication Date: 2021-04-30
ZHUHAI EXENSE MEDICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] First, the temperature measurement accuracy is low: the resistance value accuracy of the products made by the existing NTC ceramic powder formula system and process technology is within ±1%, and the B value is within ±1%, which cannot meet the ±0.1 of the medical body temperature measurement sensor in batches. ℃ temperature measurement accuracy requirements;
[0006] The second is poor stability in use: the resistance value change rate of products made of the existing NTC ceramic powder formula system and process technology reaches ±0.3% after high-temperature aging and thermal shock, which is the same as the ±0.3% required by medical temperature measurement sensors. % resistance value accuracy and ±0.3% B value accuracy are similar, resulting in poor stability and short service life of the product, and long-term use cannot meet the temperature measurement requirements of medical temperature measurement sensors

Method used

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  • Medical gold-containing high-precision and high-stability ntc thermal chip and its manufacturing method
  • Medical gold-containing high-precision and high-stability ntc thermal chip and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In this embodiment, the steps of making a medical gold-containing high-precision and high-stability NTC thermal chip are as follows:

[0035] (1) Preparation of NTC thermosensitive ceramic powder:

[0036] ①Initial mixing: Weigh 40% manganese dioxide, 46% cobalt tetroxide, 9% ferric oxide, 3% nickel dioxide and 2% gold trioxide nano-scale powder according to the mass percentage, and then pour it into the dry Primary mixing in mixer.

[0037] ②Primary ball milling: Add the mixed powder obtained from the initial mixing into the ball mill tank, then add zirconium balls and purified water as the medium, the mass ratio of zirconium balls, mixed powder and purified water is 3:1:2, and then turn it at 90 rpm The frequency of ball milling per minute is 20-30 hours.

[0038] ③Primary drying: Send the slurry obtained from primary ball milling into an oven at 90°C for drying to remove moisture.

[0039] ④Primary sieving: sieve the powder obtained from primary drying.

[0040] ...

Embodiment 2

[0052] In this embodiment, the steps of making a medical gold-containing high-precision and high-stability NTC thermal chip are as follows:

[0053] (1) Preparation of NTC thermosensitive ceramic powder:

[0054] ①Initial mixing: Weigh 30% manganese dioxide, 52% cobalt tetroxide, 12% ferric oxide, 5% nickel dioxide and 1% gold trioxide nanoscale powder according to the mass percentage, and then pour it into the dry Primary mixing in mixer.

[0055] ②Primary ball milling: Add the mixed powder obtained from the initial mixing into the ball mill tank, then add zirconium balls and purified water as the medium, the mass ratio of zirconium balls, mixed powder and purified water is 3:1:2, and then turn it at 90 rpm The frequency of ball milling per minute is 20-30 hours.

[0056] ③Primary drying: Send the slurry obtained from primary ball milling into an oven at 90°C for drying to remove moisture.

[0057] ④Primary sieving: sieve the powder obtained from primary drying.

[0058] ...

Embodiment 3

[0070] In this embodiment, the steps of making a medical gold-containing high-precision and high-stability NTC thermal chip are as follows:

[0071] (1) Preparation of NTC thermosensitive ceramic powder:

[0072] ①Initial mixing: Weigh 50% manganese dioxide, 40% cobalt tetroxide, 5% ferric oxide, 3% nickel dioxide and 2% gold trioxide nano-scale powder according to the mass percentage, and then pour it into the dry Primary mixing in mixer.

[0073] ②Primary ball milling: Add the mixed powder obtained from the initial mixing into the ball mill tank, then add zirconium balls and purified water as the medium, the mass ratio of zirconium balls, mixed powder and purified water is 3:1:2, and then turn it at 90 rpm The frequency of ball milling per minute is 20-30 hours.

[0074] ③Primary drying: Send the slurry obtained from primary ball milling into an oven at 90°C for drying to remove moisture.

[0075] ④Primary sieving: sieve the powder obtained from primary drying.

[0076] ...

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Abstract

The invention relates to a medical gold-containing high-precision and high-stability NTC thermal chip. The medical gold-containing high-precision and high-stability NTC thermal chip comprises a thermal ceramic sheet and metal electrodes arranged on both surfaces of the thermal ceramic sheet. The heat-sensitive ceramic piece is made of 30-50% manganese dioxide, 40-52% cobalt tetroxide, 5-12% iron oxide, 3-5% nickel oxide and 1-2% gold oxide by mass percentage The nano-scale powder is mixed and sintered. The invention also relates to a manufacturing method of the medical gold-containing high-precision and high-stability NTC thermal chip. The medical gold-containing high-precision and high-stability NTC thermal chip of the invention has the advantages of high temperature measurement accuracy, high use stability and long service life.

Description

technical field [0001] The invention belongs to the technical field of electronic components, in particular to a medical gold-containing high-precision and high-stability NTC thermosensitive chip and a manufacturing method thereof. Background technique [0002] NTC is the abbreviation of Negative Temperature Coefficient, which means a negative temperature coefficient. NTC heat-sensitive materials are made of two or more metal oxides such as manganese, cobalt, iron, nickel, and copper by ceramic technology. Due to the correlation between resistance and temperature, NTC thermal chips are widely used in temperature measurement, temperature control, and temperature compensation. The annual drift rate of temperature accuracy, resistance value and B value represents the stability of long-term use. [0003] The NTC thermal chip plays a central role in converting the temperature variable into the required electronic signal in the circuit. Thermistors and temperature sensors compose...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/01C04B35/622C04B41/88H01C7/04G01K7/22G01K13/00
CPCH01C7/043H01C7/046G01K7/22C04B35/01C04B35/016C04B35/622C04B41/5116C04B41/88C04B2235/6567C04B2235/6565C04B2235/6562C04B2235/3267C04B2235/3279C04B2235/3277C04B2235/3272C04B2235/3289G01K13/20C04B41/4539C04B41/0072
Inventor 黄亚桃熊成勇赵辉唐黎民柏琪星
Owner ZHUHAI EXENSE MEDICAL TECH
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