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Negative temperature coefficient heat sensitive ceramic material preparation method

A negative temperature coefficient, heat-sensitive ceramic technology, applied in the field of temperature sensor preparation, can solve the problems of unsuitability for industrial production, differences in the proportion of powder elements, difficulty in obtaining stoichiometric ratios, etc. Easy-to-control parameters

Active Publication Date: 2013-07-31
XINJIANG ZHONGKE SENSING CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The sol-gel method can enable various oxides to be mixed at the molecular level, and can obtain stoichiometric powder materials, but this method has high raw material costs and complicated processes, and is not suitable for industrial production. produce harmful gases and cause pollution
The liquid-phase co-precipitation method is easy to prepare powder materials with small particle size and uniform distribution, but due to the different pH values ​​of the precipitation of each element, it is easy to cause step-by-step precipitation, and it is easy to cause the proportion of the precipitated powder elements to be different from the original formula, so that Difficult to obtain powders with exact stoichiometric ratio

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] a. Weigh manganese dioxide, nickel oxide and magnesium oxide in a molar ratio of 1.7:0.8:0.5 and place them in a container, add deionized water, and stir for 10 minutes at a speed of 80r / min in a water bath at a temperature of 30°C , to get a mixture;

[0023] b. Mix manganese dioxide, nickel trioxide and magnesium oxide in equal parts with functional additive oxalic acid in a molar ratio of 1:1, add solvent and stir in deionized water, and configure it into a solution with a concentration of 1mol / L. Add it into the mixture obtained in step a, continue to keep stirring in the water bath, and at the same time perform ultrasonic treatment, the frequency of the ultrasonic wave is 15kHz, and the power is 100W to make the mixing more uniform until the solvent evaporates to obtain a viscous mixture;

[0024] c. drying the mixture obtained in step b in an oven at a temperature of 70° C. for 8 hours to obtain a powder;

[0025] d. Calcining the powder obtained in step c at a t...

Embodiment 2

[0028] a. Weigh manganese dioxide, nickel trioxide and iron oxide in a molar ratio of 1.6:0.5:1 and place them in a container, add deionized water and stir for 20 minutes at a speed of 100r / min in a water bath at a temperature of 50°C , to get a mixture;

[0029] b. Mix manganese dioxide, nickel sesquioxide and iron oxide with citric acid as the functional additive in a molar ratio of 1:1.5, add the solvent and stir evenly in absolute ethanol, and configure it into a solution with a concentration of 5mol / L. Add it to the mixture obtained in step a, continue to keep stirring in the water bath, and perform ultrasonic treatment at the same time, the frequency of the ultrasonic wave is 20kHz, and the power is 500W to make the mixing more uniform until the solvent evaporates to obtain a viscous mixture;

[0030] c. drying the mixture obtained in step b at a temperature of 100° C. under vacuum for 10 hours to obtain a powder;

[0031] d. Calcining the powder obtained in step c at a...

Embodiment 3

[0034] a. Weigh analytically pure manganese dioxide and nickel sesquioxide in a container with a molar ratio of 2.1:0.9, add deionized water, and stir for 40 minutes at a speed of 150 r / min in a water bath at a temperature of 70°C. get the mixture;

[0035] b. Mix manganese dioxide and nickel trioxide in equal parts with functional additive oxalic acid at a molar ratio of 1:2, and add a solvent that is a mixture of deionized water and absolute ethanol with a mass ratio of 1:1 and stir evenly. Be configured as a solution with a concentration of 8mol / L, add it to the mixture obtained in step a, continue to keep stirring in a water bath, and perform ultrasonic treatment at the same time. thick mixture;

[0036] c. drying the mixture obtained in step b in an oven at a temperature of 90° C. for 18 hours to obtain a powder;

[0037] d. Calcining the powder obtained in step c at a temperature of 850° C. for 6 hours to obtain a uniformly mixed powder;

[0038] e. The powder obtaine...

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Abstract

The present invention relates to a negative temperature coefficient heat sensitive ceramic material preparation method. According to the method, two or three analytical pure oxides selected from manganese, nickel, iron and magnesium are adopted as raw materials, a functional additive and a solvent are added to carry out a reaction, calcinations is performed to obtain powder with characteristics of uniform mixing, consistent particle size and good crystallinity, and the obtained powder is subjected to processing processes such as sheet pressing molding, sintering, slicing, coating of the electrode, and scribing to obtain the negative temperature coefficient heat sensitive ceramic material with a characteristic of good resistance value and B value consistency. Compared to the conventional solid phase reaction method and the liquid phase reaction method, the method of the present invention has the following advantages that: raw material cost is low, a preparation process is simple, process parameters are easily controlled, and the like, wherein the heat sensitive ceramic material prepared by the method has good consistency and good uniformity, and industrial scale production prospects are provided.

Description

technical field [0001] The invention belongs to the field of temperature sensor preparation, in particular to a low-cost, easy-to-amplify method for preparing a negative temperature coefficient heat-sensitive ceramic material. Background technique [0002] Negative temperature coefficient thermistor elements have the advantages of high sensitivity and high accuracy, and are widely used in temperature measurement, control, temperature compensation, protection of circuits and electronic components, and related instruments and applications for flow rate, flow, and radiation measurement. With the rapid development of electronic information technology and digitalization, there are requirements for miniaturization, light weight and thinning of negative temperature coefficient thermistor temperature sensors. "Light, thin, short and small" high-precision and interchangeable negative Temperature coefficient heat-sensitive ceramic materials have become the mainstream direction of deve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/01C04B35/36C04B35/622
Inventor 姚金城张丙寅常爱民王军华
Owner XINJIANG ZHONGKE SENSING CO LTD
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