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Method for improving sintering property of manganese-cobalt-iron-base thermal sensitive ceramic

A technology based on thermal sensitivity and sinterability, applied in the direction of resistors with negative temperature coefficient, non-adjustable metal resistors, resistors, etc., can solve the problems of high sintering temperature and poor sintering property, and achieve lower sintering temperature Density, the effect of reducing mass transfer resistance

Inactive Publication Date: 2019-03-19
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Ternary manganese-cobalt-iron-based materials are widely used due to their high resistivity and good thermal sensitivity. However, ternary manganese-cobalt-iron-based materials still have the problems of high sintering temperature and poor sinterability, so research on this issue is carried out. is of great significance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1 (contrast, without adding sintering aid bismuth trioxide)

[0018] a. Press Mn 1.1 co 1.5 Fe 0.4 o 4 7.7487g of analytically pure dicobalt trioxide, 5.2420g of analytically pure manganese tetroxide and 2.0093g of analytically pure ferric oxide were weighed and mixed for 12 hours, and the slurry after ball milling was placed in an oven at a temperature of 90°C. Grinding for 6 hours after drying for 20 hours to obtain mixed oxide powder;

[0019] b. Calcining the oxide powder obtained in step a at a temperature of 950° C. for 3 hours, and grinding again for 4 hours;

[0020] c. Perform secondary ball milling on the ground powder in step b for 12 hours, dry in an oven at a temperature of 90° C. for 20 hours, and grind for 6 hours to obtain a powder material;

[0021] d. The powder material obtained in step c is compressed into a disc with a diameter of 10mm and a thickness of about 2mm under 1.2MPa, and then pressed into a green body through a cold isosta...

Embodiment 2

[0024] a. Press Mn 1.1 co 1.5 Fe 0.4 o 4 The mass composition of the analytically pure dicobaltous oxide 7.7487g, the analytically pure manganous manganese tetroxide 5.2420g and the analytically pure ferric oxide 2.0093g were placed in a ball milling tank for ball milling and mixing for 8 hours, and the ball milled slurry was placed in Dry in an oven at 90°C for 20 hours, place in an agate mortar and grind for 3 hours to obtain mixed oxide powder;

[0025] b. Calcining the oxide powder obtained in step a at a temperature of 800° C. for 3 hours, and grinding again for 4 hours to obtain oxide powder;

[0026] c. According to the mass percentage of 0.05, the purity of the sintering aid is 99.0%, and the particle size is 10 μm Bi 2 o 3 Add it to the ground powder in step b, perform secondary ball milling for 12 hours, dry in an oven at a temperature of 90°C for 20 hours, and grind for 6 hours to obtain a powder material;

[0027] d. The powder material obtained in step c is ...

Embodiment 3

[0030] a. Press Mn 1.1 co 1.5 Fe 0.4 o 4 The mass composition of the analytically pure dicobaltous oxide 7.7487g, the analytically pure manganic manganese tetroxide 5.2420g and the analytically pure ferric oxide 2.0093g were placed in a ball mill jar for ball milling and mixing for 12 hours, and the ball milled slurry was placed in drying in an oven at 90°C for 20 hours, and grinding in an agate mortar for 6 hours to obtain mixed oxide powder;

[0031] b. Calcining the oxide powder obtained in step a at a temperature of 950° C. for 4 hours, and grinding again for 4 hours to obtain oxide powder;

[0032] c. According to the mass percentage of 0.1, the purity of the sintering aid is 99.7%, and the particle size is 20μm Bi 2 o 3 Adding to the oxide powder obtained in step b, performing secondary ball milling for 12 hours, drying in an oven at a temperature of 90°C for 20 hours, and grinding for 6 hours to obtain a powder material;

[0033] d. The powder material obtained in...

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Abstract

The invention provides a method for improving the sintering property of manganese-cobalt-iron-base thermal sensitive ceramic. The method comprises the steps of with transition metal oxides including cobalt sesquioxide, trimanganese tetroxide and iron sesquioxide as main raw materials, adding a trace sintering aid, namely bismuth trioxide, preparing a powder material by virtue of a solid-phase reaction method, and finally preparing the manganese-cobalt-iron-base thermal sensitive ceramic by virtue of forming and sintering processes. According to the manganese-cobalt-iron-base thermal sensitiveceramic prepared by virtue of the preparation method, the crystallinity of crystals can be greatly improved, and the sintering temperature can be greatly deceased. The material constant B25 / 50 of theceramic is 3695K-3730K, the room temperature specific resistance rho value is 656omaga.cm-894omaga.cm, and the ceramic has very good thermal sensitivity and consistency and can be widely applied to the temperature measurement and control of electronic parts and components such as high-precision instruments.

Description

technical field [0001] The invention relates to a method for improving the sinterability of manganese-cobalt-iron-based heat-sensitive ceramics, which belongs to the field of oxide heat-sensitive ceramics. Background technique [0002] Negative temperature coefficient (NTC) thermistors are widely used in temperature measurement, temperature control and suppression of surge current due to their advantages such as high sensitivity, low thermal inertia, good interchangeability, high reliability, wide temperature measurement range, and high precision. And many other aspects. In recent years, with the advancement of electronic components to the direction of integration and miniaturization, the application fields of traditional thermal components are limited due to the difficulty of integration. However, with the development of semiconductor micro-nano processing technology and surface mount technology, it is inevitable to miniaturize and chip the NTC thermistor on the basis of h...

Claims

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Application Information

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IPC IPC(8): C04B35/32C04B35/622C04B35/64H01C7/04H01C17/30
CPCC04B35/265C04B35/622C04B35/64C04B2235/3263C04B2235/3275C04B2235/3298C04B2235/656C04B2235/6567H01C7/046H01C17/30
Inventor 姚金城王兵王军华常爱民
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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