Method for preparing Ti2AlC ceramic powder through aluminothermic reduction

A ceramic powder and thermite technology, which is applied in the field of preparation of Ti2AlC ceramic powder by thermite reduction, can solve the problems of high raw material cost and high process cost, and achieve the effect of low cost, high purity and simple raw material requirements

Active Publication Date: 2020-08-07
YANGTZE NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, although the preparation process of this method is relatively fast, it still directly uses metal powder as the raw material, and adopts ultrasonic-assisted thermal explosion as the preparation process, and still has the defects of high raw material cost and process cost.

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  • Method for preparing Ti2AlC ceramic powder through aluminothermic reduction
  • Method for preparing Ti2AlC ceramic powder through aluminothermic reduction
  • Method for preparing Ti2AlC ceramic powder through aluminothermic reduction

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specific Embodiment approach

[0049] Specific embodiments: a kind of aluminothermic reduction prepares Ti 2 The method of AlC ceramic powder, process such as figure 1 shown, including the following steps:

[0050] Step 1: Mix sodium fluorotitanate, aluminum powder and activated carbon powder that meet the ratio requirement of 1:(0.16-0.38):(0.02-0.05) and then wet grind them first. The wet grinding time of materials is 2-8 hours. After the slurry is dried, it is activated by dry milling under vacuum or inert atmosphere, and the dry milling time is 4-12 hours;

[0051] Step 2: Put the mixed and ground material into the mold, and cold press it under the condition of 40-120MPa to obtain a green body;

[0052] Step 3: Put the green body in a vacuum reduction furnace for thermal reduction, the reduction temperature is 800-1500°C, and the vacuum degree is 10 -4 -10Pa, the reduction time is 1-6 hours;

[0053] Step 4: After the reduction, control the temperature at 1000-1350°C for vacuum distillation, the dis...

Embodiment 1

[0061] On the basis of meeting the above specific implementation methods, the following requirements are implemented: 300 grams of sodium fluotitanate, 74.3 grams of aluminum powder and 8.8 grams of activated carbon powder are mixed, in anhydrous ethanol medium, the ratio of material to ball is 2:1, and planetary The ball mill was wet milled for 4 hours, followed by vacuum drying at 60°C for 12 hours; the dried mixed material was placed in a high-energy ball mill, and high-energy activation was performed under a high-purity argon atmosphere for 8 hours; the activated mixed material was Put it in a steel mold and cold press it into a billet under a pressure of 50 MPa; then put the billet in a reduction furnace for thermal reduction under vacuum conditions, the reduction temperature is 1250 ° C, and the vacuum degree is 10 -3 Pa, the reduction time is 3 hours; after the reduction process ends, the vacuum system is turned on for vacuum distillation, the distillation temperature is...

Embodiment 2

[0064] On the basis of meeting the above-mentioned specific embodiments, the following requirements are implemented: 616.3 grams of sodium fluotitanate, 152.5 grams of aluminum powder and 18.1 grams of activated carbon powder are mixed, in anhydrous ethanol medium, the ratio of material to ball is 2:1, and planetary The ball mill was wet-milled for 5 hours, followed by vacuum drying at 60°C for 16 hours; the dried mixture was placed in a high-energy ball mill for high-energy activation under vacuum for 10 hours; the activated mixture was placed in a steel In the mold, the billet is cold-pressed under a pressure of 50 MPa; then the billet is placed in a reduction furnace for thermal reduction under vacuum conditions, the reduction temperature is 1250 ° C, and the vacuum degree is 10 -3 Pa, the reduction time is 4 hours; after the reduction process ends, the vacuum system is turned on for vacuum distillation, the distillation time is 7 hours, the control system is closed after co...

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Abstract

The invention discloses a method for preparing Ti2AlC ceramic powder by aluminothermic reduction. The method is characterized by comprising the following steps: with fluorotitanate, aluminum powder and activated carbon powder in a mass ratio of 1: (0.16-0.38): (0.02-0.05) as raw materials, performing mixing and grinding; carrying out thermal reduction reaction and vacuum distillation; and then removing impurities. The method has the advantages of simple raw material requirements, wide sources, lower cost, shorter process flow, higher reaction efficiency, better controllability, full-element utilization and the like.

Description

technical field [0001] The invention relates to the technical field of preparation of ceramic materials, in particular to an aluminothermic reduction preparation of Ti 2 AlC ceramic powder method. Background technique [0002] In recent years, with the rapid development of social economy, people's demand for ceramic materials has become more and more extensive. Ceramic materials are inorganic non-metallic materials with high melting point, high hardness, high wear resistance and oxidation resistance. . It can be used as a structural and tool material, while ceramics also have certain special properties, so they can also be used as functional materials. Ceramic powder is the material for preparing ceramic products. Good ceramic products are usually prepared with ceramic powder, which can obtain more exquisite appearance and excellent performance. [0003] Mn+1AXn (MAX phase for short) ceramics are a type of ternary carbon / nitride ceramics with a nano-layered structure, whe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/90
CPCC01P2002/72C01P2004/61C01P2006/80C01B32/90
Inventor 赵坤李言栋张晓东
Owner YANGTZE NORMAL UNIVERSITY
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