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Preparation of thermosensitive resistor for room temperature solid state reaction

Solid phase chemical reactions at room temperature prepared a thermistor
A solid phase chemical reaction method for the preparation of a negative temperature coefficient thermistor ceramic material, the method containing cobalt, manganese,
Nickel salts and alkali as raw materials, solid-phase chemical reactions at room temperature Preparation of uniform size, good dispersion of the powder, and the powder pre-
Compression molding, isostatic pressing, sintering the negative temperature coefficient thermistor ceramic material. With a negative temperature coefficient obtained by the method of the present invention,
Number thermistor ceramic material by conventional slicing method, the electrode coating, dicing, welding, packaging products made of NTC thermistor resistance
And B values ​​higher consistency, better exchange of performance, stability and reproducibility, and can be widely used in household air conditioners, car air conditioners, refrigerators, freezers, water heaters, water dispensers, heaters, coffee machine, dryer as well as temperature measurement and control in low oven, incubators and other occasions.

A solid-phase chemical reaction negative temperature coefficient thermistor ceramic material prepared, characterized by solid phase
Chemical reaction, the specific operation the following steps:
a, to the cobalt, manganese, nickel salts and base as raw materials, the molar ratio of Mn: Co: Ni: base =
22-24: 22-24: 1: 115-117.5 ingredients, mixing at room temperature, triturated 1 hour, the solid reactants
Phase chemical reactions into a uniform color of black powder;
b, black powder was washed with deionized water to neutral, and to remove the soluble by-product, and dried to obtain powder;
c, the powder in a muffle furnace temperature 500-600 ℃ calcined for 2 hours and then pre-molding, isostatic pressing, at a temperature
Sintering 1160-1180 ℃ 4 hours, you can get a negative temperature coefficient thermistor ceramic material.
The method according to claim 1, wherein step (a) cobalt, manganese, nickel acetate, cobalt salts, manganese acetate
And nickel acetate, the base is sodium hydroxide.


Technical field
[0001] The present invention relates to the use of solid-phase chemical reaction of negative temperature coefficient thermistor ceramic material is a semiconductor mass
Sensor fields.
BACKGROUND
[0002] In recent years, the negative temperature coefficient (NTC) thermistor temperature sensor, has been widely used in household air conditioners, car
Air conditioners, refrigerators, freezers, water heaters, water dispensers, heaters, coffee machines, dryers and low-temperature oven, incubators and other fields
Combined temperature measurement and control. With the temperature measurement, temperature control accuracy requirements of the continuous improvement of negative temperature coefficient thermistor element with
There are high-precision, high reliability, and should have long-term stability and interchangeability。 Of negative temperature coefficient thermistor element
Can depend on the quality of the raw material powder in large part.
A new method [0003] Therefore seek process is simple, easy to operate and can effectively improve the amplification sensitive material quality becomes
Is very important.
SUMMARY OF THE INVENTION
[0004] The present invention is to provide a solid-phase chemical reaction of negative temperature coefficient thermistor material side
Method, which manganese, cobalt, nickel acetate, and a base as raw materials, grinding, washing with deionized water, dried, calcined, prepared
Uniform size, good dispersion of the powder, then the powder preload molding, isostatic pressing, sintering, you can prepare a negative temperature coefficient
(NTC) thermistor ceramic material. With a negative temperature coefficient thermistor ceramic material obtained by the method of the present invention, often
Regulatory approach sliced, coated electrode, dicing, high welding, packaging, products made of NTC thermistor resistance and B value consistency,
Interchangeable better performance, stability and reproducibility, and can be widely used in household air conditioners, car air conditioners, refrigerators, freezers, water heaters,
Temperature measurement and control dispenser, heaters, coffee machines, dryers and low-temperature oven, incubators and other occasions.
[0005] A solid-phase chemical reaction of negative temperature coefficient thermistor material of the present invention, the solid phase
Chemical reaction, the specific operation the following steps:
[0006] a, to the cobalt, manganese, nickel and base salts as raw materials, the molar ratio of Mn: Co: Ni: base =
22-24: 22-24: 1: 115-117.5 ingredients, mixing at room temperature, triturated 1 hour, the solid reactants
Phase chemical reactions into a uniform color of black powder;
[0007] b, black powder was washed with deionized water to neutral, and to remove the soluble by-product, and dried to obtain powder;
[0008] c, the powder in a muffle furnace temperature 500-600 ℃ calcined for 2 hours and then pre-molding, isostatic pressing, in
Sintering temperature of 1160-1180 ℃ 4 hours, you can get a negative temperature coefficient thermistor ceramic material.
[0009] Step a cobalt, manganese, nickel acetate, cobalt salts, manganese and nickel acetate, nickel acetate, the base is sodium hydroxide.
[0010] The resulting slice through the thermistor ceramic material coated electrode, dicing, welding, packaging, made of NTC thermistor
Resistive element B25/50 = 3920-4000 × (1 ± 0.5%); resistance R25 ℃ in 2.0-2.6kΩ, within 1% of the finished product was
30-45%, less than 2% in the yield of 75% -95%.
[0011] A solid-phase chemical reaction of negative temperature coefficient thermistor material of the present invention, the use of the room
Temperature solid-state reaction method is simple to operate, the reaction does not require solvents, energy-saving, environmental pollution, high yield, easy to enlarge the production
And so on. Material obtained by the method according to the present invention, by conventional methods section, the electrode coating, dicing, soldering, encapsulation, the system
Higher resistance to the NTC thermistor B value of the product and consistency, good interchangeability.
Embodiment
[0012] Example 1
[0013] at a molar ratio of 23:23: 1: Take 117.5 said manganese acetate, cobalt acetate, nickel acetate and sodium hydroxide, at room temperature
Mixed grinding, 1 hour, the reaction becomes solid phase chemical reaction uniform color black powder;
[0014] black powder was washed with deionized water to neutral, and to remove the soluble by-product, and dried to obtain powder;
[0015] The powder in a muffle furnace at 500 ℃ calcined for 2 hours and then pre-molding, isostatic pressing, at a temperature
Sintered 1160 ℃ 4 hours, you can get a negative temperature coefficient thermistor ceramic material.
[0016] The obtained negative temperature coefficient thermistor ceramic material by conventional slicing method, the electrode coating, dicing, welding primer
Lines and packaging, NTC thermistor made B25/50 = 3920 × (1 ± 0.5%), the resistance R25 ℃ approximately 2.0kΩ, 1%
In the finished product was 30-45% less than 2% in the yield of 75% -90%.
[0017] Example 2
[0018] a, a molar ratio of 23:22: 1: 115 to take said manganese acetate, cobalt acetate, nickel acetate and sodium hydroxide, at room temperature
Mixed grinding, 1 hour, the reaction becomes solid phase chemical reaction uniform color black powder;
[0019] b, black powder was washed with deionized water to neutral, and to remove the soluble by-product, and dried to obtain powder;
[0020] c, in a muffle furnace the powder calcined at 600 ℃ for 2 hours and then pre-molding, isostatic pressing, at a temperature
Sintered 1170 ℃ 4 hours, you can get a negative temperature coefficient thermistor ceramic material.
[0021] The obtained negative temperature coefficient thermistor ceramic material by conventional slicing method, the electrode coating, dicing, welding primer
Lines and packaging, NTC thermistor made B25/50 = 3977 × (1 ± 0.5%), the resistance R25 ℃ approximately 2.6kΩ, 1%
In the finished product was 30-45% less than 2% in the yield of 75% -90%.
[0022] Example 3
[0023] a, a molar ratio of 22:24: 1: Take 117.5 said manganese acetate, cobalt acetate, nickel acetate and sodium hydroxide at room
Warm mixed grinding, 1 hour, the reaction becomes solid phase chemical reaction uniform color black powder;
[0024] b, black powder was washed with deionized water to neutral, and to remove the soluble by-product, and dried to obtain powder;
[0025] c, in a muffle furnace the powder calcined at 600 ℃ for 2 hours and then pre-molding, isostatic pressing, at a temperature
Sintered 1180 ℃ 4 hours, you can get a negative temperature coefficient thermistor ceramic material.
[0026] The obtained negative temperature coefficient thermistor ceramic material by conventional slicing method, the electrode coating, dicing, welding primer
Lines and packaging, NTC thermistor made B25/50 = 3960 × (1 ± 0.5%), the resistance R25 ℃ approximately 2.2kΩ, 1%
In the finished product was 30-45% less than 2% in the yield of 75% -90%.
[0027] Example 4
[0028] a, a molar ratio of 24: 22: 1: 116 to take said manganese acetate, cobalt acetate, nickel acetate and sodium hydroxide, at room temperature
Mixed grinding, 1 hour, the reaction becomes solid phase chemical reaction uniform color black powder;
[0029] b, black powder was washed with deionized water to neutral, and to remove the soluble by-product, and dried to obtain powder;
[0030] c, in a muffle furnace the powder calcined at 550 ℃ for 2 hours and then pre-molding, isostatic pressing, at a temperature
Sintered 1175 ℃ 4 hours, you can get a negative temperature coefficient thermistor ceramic material.
[0031] The obtained negative temperature coefficient thermistor ceramic material by conventional slicing method, the electrode coating, dicing, welding primer
Lines and packaging, NTC thermistor made B25/50 = 4000 (1 ± 0.5%), the resistance of about 2.2kΩ, within 1% of
The yield was 35-45% less than 2% in the yield of 80% -95%。


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