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Negative temperature coefficient thermistor raw material composition and application thereof

A technology of negative temperature coefficient and thermosensitive composition, which is applied in the field of negative temperature coefficient thermistor raw material composition, which can solve the problems of poor electrical stability, difficulty in uniform distribution, and poor concentration of electrical performance parameters of materials.

Active Publication Date: 2016-02-17
GUANGDONG FENGHUA ADVANCED TECH HLDG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, an important functional material Al must be added to most formulation systems of NTC thermistor materials with high resistance (above 100KΩ) and high B value (above 3900). 2 o 3 , its addition amount is very small (1wt% ~ 10wt%), but its effect is relatively large, it can greatly improve the resistivity of heat-sensitive materials, because Al 2 o 3 It is difficult to dissolve in water. In the process of making heat-sensitive powder, it is difficult to distribute evenly in the powder. This will inevitably lead to poor concentration of material electrical performance parameters (resistance value, material constant B value), and a large deviation range. , generally in J-level (±5%), K-level (±10%) and M-level (±20%), poor electrical stability

Method used

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  • Negative temperature coefficient thermistor raw material composition and application thereof
  • Negative temperature coefficient thermistor raw material composition and application thereof
  • Negative temperature coefficient thermistor raw material composition and application thereof

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preparation example Construction

[0031] The preparation method of the negative temperature coefficient thermosensitive composition of one embodiment, comprises the following steps:

[0032] Step S110, adding the above-mentioned negative temperature coefficient thermistor raw material composition into deionized water, performing wet grinding, and then drying to obtain a mixed powder.

[0033] Preferably, the mass ratio of the added deionized water to the negative temperature coefficient thermistor raw material composition is 2:1˜3:1.

[0034] Preferably, the wet grinding is carried out using a polyurethane ball mill tank, and the ball milling medium is zirconium balls. Further preferably, the diameter of the zirconium balls is 5-7.5 mm, and the mass ratio of the zirconium balls to the negative temperature coefficient thermistor raw material composition is 2:1-3:1. Further preferably, the grinding speed is 400-500 r / min.

[0035] Preferably, the wet grinding time is 4-6 hours.

[0036] Preferably, the drying...

Embodiment 1

[0060] NTC thermistor raw materials, containing the following components: Mn 3 o 4 260g, Co 3 o 4 20g, NiO20g, Fe 2 o 3 88g, Nd 2 o 3 8g, Al(NO 3 ) 3 9H 2 O4g.

[0061] Implementation process: Accurately weigh each raw material according to the above formula components, with a total weight of 400g, pour it into a polyurethane ball mill tank equipped with 800gΦ7.5mm zirconium balls, add 800g of deionized water, seal it and wet mill it on a planetary ball mill for 4 hours , with a speed of 500r / mm, pour the ground material into a stainless steel plate, put it in an oven at 150°C and bake for 2 hours, pre-burn the dried powder in a muffle furnace at 1000°C for 1 hour, and then put the pre-fired powder Wet mill on a planetary ball mill for 4 hours and dry in an oven at 150°C for 2 hours, pass the dried powder through a 80-mesh sieve, add 60g of PVA solution with a mass concentration of 4%, and put it in a 150°C oven after mixing evenly. Bake in an oven for 10 minutes, a...

Embodiment 2

[0064] NTC thermistor raw materials, containing the following components: Mn 3 o 4 120g, Co 3 o 4 180g, NiO20g, Fe 2 o 3 36g, Nd 2 o 3 4g, Al(NO 3 ) 3 .9H 2 O40g.

[0065] Implementation process: Accurately weigh each raw material according to the above formula components, with a total weight of 400g, pour it into a polyurethane ball mill tank equipped with 1200gΦ5mm zirconium balls, add 1200g of deionized water, seal it, and wet mill it on a planetary ball mill for 6h, at a speed of 400r / mm, pour the ground material into a stainless steel plate, put it in a 100°C oven and bake for 3 hours, pre-burn the dried powder in a 900°C muffle furnace for 2 hours, and put the pre-fired powder on the planetary Wet mill on a type ball mill for 6 hours and dry in an oven at 100°C for 3 hours. Pass the dried powder through an 80-mesh sieve, add 40g of PVA solution with a mass concentration of 7%, and put it into an oven at 100°C after mixing evenly. Bake for 20 minutes, and then ...

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Abstract

The invention discloses a negative temperature coefficient thermistor raw material composition, a negative temperature coefficient thermosensitive composition, a preparation method of the negative temperature coefficient thermosensitive composition and a preparation method of a negative temperature coefficient thermistor chip. The negative temperature coefficient thermistor raw material composition is prepared from the following components in percentage by mass: 30 to 65 percent of Mn3O4, 5 to 45 percent of Co3O4, 5 to 25 percent of NiO, 5 to 30 percent of Fe2O3, 0.5 to 2.0 percent of Nd2O3 and 1 to 10 percent of Al(NO3)3.9H2O. Al<3+> is introduced into the negative temperature coefficient thermistor raw material composition in an aluminum nitrate form instead of an Al2O3 solid form; the aluminum nitrate is good in water solubility and is easily and uniformly distributed in the composition, so that the deviation between a resistance value and B value can be reduced, and electrical resistivity and B value precision are improved; in addition, by adding high-enthalpy rare earth oxide Nd2O3, the enthalpy of oxide is 1783KJ / mol, and the oxides do not easily generate chemical reaction at high temperature, so that the ageing influence caused by chemical changes is reduced, and further the electrical stability of the thermistor is improved.

Description

technical field [0001] The invention relates to a negative temperature coefficient thermistor raw material composition, a negative temperature coefficient thermosensitive composition, a preparation method of the negative temperature coefficient thermosensitive composition and a preparation method of a negative temperature coefficient thermistor chip. Background technique [0002] NTC thermistor (temperature coefficient thermistor) refers to the resistance whose resistance decreases exponentially with the increase of temperature. Because of its advantages of temperature sensitivity, small size, fast response, low price and good interchangeability, It is widely used in temperature detection, temperature control and temperature compensation. [0003] At present, an important functional material Al must be added to most formulation systems of NTC thermistor materials with high resistance (above 100KΩ) and high B value (above 3900). 2 o 3 , its addition amount is very small (1w...

Claims

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Application Information

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IPC IPC(8): C04B35/32
Inventor 唐斌周庆波李强
Owner GUANGDONG FENGHUA ADVANCED TECH HLDG
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