High precision thermosensitive resistor nanometer powder

A nano-powder, thermistor technology, applied in resistors, resistor manufacturing, circuits, etc., can solve the problems of low uniformity of powder chemical composition, low yield, poor repeatability, etc., to improve thermal aging resistance. performance, improved thermal aging resistance, and the effect of good thermal aging resistance

Inactive Publication Date: 2008-09-03
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The general traditional process of preparing heat-sensitive resistor oxide powder is mechanical grinding method. Factors such as low uniformity of powder chemical composition, large particle size (micron level) and poor repeatability of the powder prepared by this method affect the subsequent process and Chips have had adverse effects, resulting in low product yield and low precision

Method used

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  • High precision thermosensitive resistor nanometer powder
  • High precision thermosensitive resistor nanometer powder
  • High precision thermosensitive resistor nanometer powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: First, the molar ratio is: Cr:Ni:Mn=5:30:65, respectively weigh 0.0005 moles, 0.003 moles, 0.0065 moles of Cr, Ni, and Mn nitrates as raw materials, mix and dissolve them in 67 mL of deionized In water, the molar concentration of metal ions is controlled to be 0.15mol / L, and it is configured as a main component solution; 3.89g of citric acid and 9g of polyethylene glycol (PEG) are added to the prepared solution to make a mixed solution, which is adjusted with ammonia water The pH of the mixed solution is 3, and the ratio of the total number of moles of metal ions in the mixed solution to citric acid is 1:1.6; the mixed solution is heated and stirred for 0.5 hours, and a brown transparent sol is formed as the hydrolysis and polymerization reactions proceed. , put the sol liquid in a drying oven at 120°C to obtain a dry brown gel; put the obtained dry brown gel into a muffle furnace, heat it at a temperature of 450°C for 2 hours, and then carry out spontaneous c...

Embodiment 2

[0020] Embodiment 2: First, the molar ratio is: Cr:Ni:Mn=10:30:60, respectively weigh 0.001 mole, 0.003 mole, 0.006 mole of Cr, Ni, Mn nitrate as raw material, mix and dissolve into 40mL deionized In water, control the molar concentration of metal ions: 0.25mol / L, and configure it as the main component solution; add 4.86g of citric acid and 10g of polyethylene glycol (PEG) to the prepared solution to make a mixed solution, and use ammonia water to Adjust the pH of the mixed solution to 4, and the ratio of the total number of moles of metal ions in the mixed solution to citric acid is 1:2.0; the mixed solution is heated and stirred for 0.7 hours, and as the hydrolysis and polymerization reactions proceed, a brown sol is formed , put the sol liquid in a drying oven at 120°C to obtain a dry dark brown gel; put the obtained dry dark brown gel into a muffle furnace, heat it at a temperature of 470°C for 2.5 hours, and then carry out spontaneous combustion treatment. To remove the o...

Embodiment 3

[0021] Embodiment Three: First, the molar ratio is: Cr:Ni:Mn=15:30:55, respectively weigh 0.0015 moles, 0.003 moles, 0.0055 moles of Cr, Ni, Mn nitrates as raw materials. Mix and dissolve into 25mL deionized In water, the molar concentration of metal ions is controlled to be: 0.4mol / L, configured as a main component solution; 583g of citric acid and 12g of polyethylene glycol (PEG) are added to the prepared solution to make a mixed solution, and the mixed solution is adjusted with ammonia water The pH of the solution=5, the ratio of the molar sum of the metal ions in the mixed solution to citric acid is 1:2.4; the mixed solution was heated and stirred for 1 hour, and as the hydrolysis and polymerization proceeded, a black sol was formed. The sol liquid is placed in a drying oven at 120°C to obtain a dry black gel; the obtained dry black gel is placed in a muffle furnace, and is kept at a temperature of 500°C for 3 hours before spontaneous combustion to remove the organic compo...

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Abstract

This invention discloses a method for producing a high accuracy thermistor nanometer powder, which uses the nitrate of Cr, Ni, Mn as raw material. The method comprises the following steps: a,adding citrate, carbowax and ammonia, heating and mixing, hydrolyzing and aggregation to form transparent colloidal solution; b, drying the colloidal solution and getting dried gel, self-igniting the gel and getting the nanometer powder. By said method, the powder has good materiality, and the size of the powder paritcle can reach to 40-60 nanometer, the powder is spinel structure, after burning its size is between 1 and 2 mum. The powder can be used repeatedly, and the rate of finished products can reach to 80%. The powder can be used to produce the thermistor with high accuracy B value and good heat resistant property.

Description

technical field [0001] The invention relates to a high-precision thermistor, in particular to a nanopowder for preparing a high-precision thermistor. Background technique [0002] At present, negative temperature coefficient thermistors have been increasingly used in circuits such as temperature control, temperature sensing, overcurrent protectors for preventing inrush current and crystal oscillator compensation, and have accounted for 40% of the temperature sensors produced in recent years. More than %, the characteristic of negative temperature coefficient thermistor is that its resistance value decreases exponentially with the increase of temperature, and most of them are made of oxides of transition metals Mn, Ni, Co, Fe, Cu, Cr, etc. [0003] The general traditional process of preparing heat-sensitive resistor oxide powder is mechanical grinding method. Factors such as low uniformity of powder chemical composition, large particle size (micron level) and poor repeatabili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/30H01C17/00
Inventor 夏海平梅春明张约品
Owner NINGBO UNIV
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