High precision thermosensitive resistor nanometer powder production method

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: 2006-04-26
NINGBO UNIV
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  • 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 production method
  • High precision thermosensitive resistor nanometer powder production method
  • High precision thermosensitive resistor nanometer powder production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: First, the mole ratio is: Cr:Ni:Mn=5:30:65, respectively weigh 0.0005 mol, 0.003 mol, 0.0065 mol of Cr, Ni, Mn nitrate as raw materials, and mix and dissolve in 67mL deionized In water, control the molar concentration of metal ions to: 0.15mol / L, and configure it as the main component solution; add 3.89g of citric acid and 9g of polyethylene glycol (PEG) to the prepared solution to make a mixed solution, adjust with ammonia 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, as the hydrolysis and polymerization reaction proceed, a brown transparent sol is formed , Place the sol liquid in a drying box at 120°C to obtain a dry brown gel; put the resulting dry brown gel in a muffle furnace, heat it at 450°C for 2 hours, and perform spontaneous combustion treatment to remove It contains organic components and obtains a black l...

Embodiment 2

[0020] Example 2: First, the mole 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 materials, and mix and dissolve in 40mL deionized In water, control the molar concentration of metal ions to: 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, adjust with ammonia The pH of the mixed solution is 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. As the hydrolysis and polymerization reaction proceed, a brown sol is formed. Place the sol liquid in a drying box at 120°C to obtain a dry dark brown gel; put the obtained dry dark brown gel in a muffle furnace, heat it at a temperature of 470°C for 2.5 hours, and then perform spontaneous combustion treatment. The organic components are removed, an...

Embodiment 3

[0021] Example 3: First, the mole ratio is: Cr:Ni:Mn=15:30:55, respectively weigh 0.0015 moles, 0.003 moles, 0.0055 moles of nitrates of Cr, Ni, Mn as raw materials, and mix and dissolve in 25mL deionized In water, control the molar concentration of metal ions to 0.4mol / L, and configure it as the main component solution; add 5.83g of citric acid and 12g of polyethylene glycol (PEG) to the prepared solution to make a mixed solution, adjust it with ammonia The pH of the mixed solution is 5, and the ratio of the total number of moles of metal ions in the mixed solution to citric acid is 1:2.4; the mixed solution is heated and stirred for 1 hour, and as the hydrolysis and polymerization reactions proceed, a black sol is formed. Place the sol liquid in a drying box at 120°C to obtain a dry black gel; put the obtained dry black gel in a muffle furnace, heat it at 500°C for 3 hours, and perform spontaneous combustion treatment to remove it Organic ingredients, and obtain a black loose po...

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PUM

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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 ª–m. 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 production method of nano powder for preparing the high-precision thermistor. Background technique [0002] At present, negative temperature coefficient thermistors have been increasingly used in circuits such as temperature control, temperature sensing, surge current prevention and crystal compensation overcurrent protectors. In recent years, they have accounted for 40% of the temperature sensors produced. % Above, the characteristic of the negative temperature coefficient thermistor is that its resistance value decreases exponentially as the temperature increases, most of which are made of transition metal oxides such as Mn, Ni, Co, Fe, Cu, and Cr. [0003] The general traditional process for preparing heat-sensitive resistor oxide powder is mechanical grinding. The chemical composition of the powder prepared by this method is not high in uniformity, the powder particle size is large...

Claims

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Application Information

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IPC IPC(8): B22F9/30H01C17/00
Inventor 夏海平梅春明张约品
Owner NINGBO UNIV
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