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Method for preparing MAX phase material

A technology for ceramic materials and materials, applied in the field of preparation of MAX phase materials, can solve the problems of stable large-scale preparation and unseen processes, achieve uniform and stable product quality, improve heat and mass transfer processes, and facilitate large-scale industrial production. Effect

Pending Publication Date: 2019-03-01
冯良荣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As far as the inventors know, so far, there is no stable process suitable for large-scale preparation of MAX phase materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1000kg containing TiO 2 , Metal silicon, carbon black + pitch (Ti:Si:C = 3:1.2:2 molar ratio) raw materials are mixed, a small amount of water is added to heat and roll, the ball is pressed by the roller ball machine, and the speed is 100kg per hour. Material into the direct heating rotary kiln (using the electric heating rotary kiln disclosed in Chinese patent CN103335513A). The direct heating type rotary kiln is filled with solid raw materials between the positive and negative electrodes, and 3500A DC or AC current is passed between the positive and negative electrodes. The materials pass through the heating section (that is, the preheating section), the high temperature section (that is, the heating section) between the positive and negative electrodes of the rotary kiln, and the cooling section is discharged. The discharge end of the rotary kiln is filled with argon as a protective atmosphere, and the argon flow rate is 80Nm 3 / h, the reaction tail gas is withdrawn f...

Embodiment 2

[0030] 1000kg contains Cr 3 C 2 , Γ-Al 2 O 3 , Carbon black + pitch (Cr:Al:C = 3:1:2 molar ratio) raw materials are mixed, a small amount of water is added to heat and roll, the ball is formed by the roller ball press, and the material is fed to the electricity at a speed of 100kg per hour. Heating in the shaft kiln. The click heat vertical kiln has a heating section, and both ends of the heating section are provided with positive and negative electrodes of a heating power source. The positive and negative electrodes are in electrical contact with the material, and the material is in the vertical kiln. The heating section of the furnace accumulates to form a current path. A DC or AC current of 5000A is passed between the positive and negative electrodes. The materials pass through the heating section (that is, the preheating section), the high temperature section (that is, the heating section) between the positive and negative electrodes of the shaft kiln, and the cooling sect...

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Abstract

The invention provides a method for preparing a layered ceramic material MAX phase material. A transition metal source, a main group element source, a carbon source and / or a nitrogen source are mixedto form a solid raw material, the solid raw material itself in a reaction furnace is directly electrified to generate heat and gradually rises to above 900 DEG C, and carbonization and / or nitridation are conducted to form the MAX phase material. The method has the advantages of high thermal efficiency, low power consumption, good product consistency, stable process and large-scale production ofthe MAX phase material.

Description

Technical field [0001] The invention belongs to the field of ceramic materials and relates to a preparation method of MAX phase materials. Background technique [0002] MAX phase materials have the advantages of low density, high modulus, good electrical conductivity, good thermal conductivity, good thermal shock resistance, high damage tolerance, and high temperature oxidation resistance. Because the MAX phase material has a layered structure, and element A is relatively mobile, it can also be removed by chemical etching to form a two-dimensional layered material, which can be used as electrode material, sensor device, etc. It has broad application prospects in aerospace, nuclear industry, energy industry, etc. [0003] The preparation of MAX phase materials includes chemical vapor deposition (CVD), hot press sintering, self-propagating sintering, pulse electric heating, vacuum sputtering and other methods. Easily confused with the present invention is the pulse electric heating...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/56C04B35/64
CPCC04B35/56C04B35/5615C04B35/58C04B35/58007C04B35/64C04B2235/3217C04B2235/3232C04B2235/3865C04B2235/3856C04B2235/424C04B2235/428C04B2235/48C04B2235/666C04B2235/658
Inventor 甘亚冯良荣
Owner 冯良荣
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