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Method for preparing high performance Ti2AIC ceramic powder

A ceramic powder, high-performance technology, applied in the field of preparation of high-performance Ti2AlC ceramic powder, can solve the problems of complex process, harsh synthesis conditions, limited promotion and application, etc., achieve high sintering activity, easy industrialization, and simple process Effect

Inactive Publication Date: 2009-09-16
HONGHE COLLEGE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synthesis conditions of these methods are relatively harsh, the preparation temperature is high, the reaction time is long, and it is difficult to prepare large-sized materials. The prepared Ti 2 AlC bulk material needs to be ground into powder, which increases the cost and complicated process, which limits the promotion and application of this material, and it is difficult to form industrialization and industrialization. In addition, after repeated heating for a long time, the structure of the material is coarsened, resulting in poor mechanical properties

Method used

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  • Method for preparing high performance Ti2AIC ceramic powder
  • Method for preparing high performance Ti2AIC ceramic powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The raw material powder is compounded according to the molar ratio Ti:Al:C=2:1:1, and the additive cryolite Na 2 AlF 6 The addition amount is 6wt.% of the total mass of calculated raw material Ti powder, Al powder and C powder, wherein Na 2 AlF 6 The quality of Al in should be included in the quality of Al in the total ratio of raw materials. Grind on a planetary ball mill for 8 hours with anhydrous ethanol as the medium, dry at 70°C or naturally, ignite the reactants with a tungsten coil under the protection of argon, and cool naturally, the obtained product is Ti 2 AlC powder.

[0020] Additive cryolite Na2AlF based on the total mass of calculated raw material Ti powder, Al powder and C powder 6 The addition amount of Ti is changed to 0.1wt.% and 25wt.%, and other conditions remain unchanged, the resulting product is also Ti 2 AlC powder.

Embodiment 2

[0022] The raw material powder is compounded according to the molar ratio Ti:Al:C=2:1:1, and 10wt.% of the total mass of Ti powder, Al powder and C powder required for calculation is added to the self-made intermetallic compound TiAl by combustion 3 , additive cryolite Na 2 AlF 6 The amount of addition is 4wt.% of the total mass of raw materials Ti powder, Al powder and C powder, where Na 2 AlF 6 The quality of Al in should be included in the quality of Al in the total ratio of raw materials. Use anhydrous ethanol as the medium to ball mill on a planetary ball mill for 8 hours at 70°C or dry naturally, then ignite the reactants with a tungsten wire coil under the protection of argon, and cool naturally, the obtained product is Ti 2 AlC powder.

[0023] In this case the intermetallic compound TiAl 3 The addition amount was changed to 5wt.% and 20wt.% of the total mass of Ti powder, Al powder and C powder respectively, and the other conditions remained unchanged, and the ob...

Embodiment 3

[0025] The raw material powder is compounded according to the molar ratio Ti:Al:C=2:1:1, and 20wt.% of the total mass of Ti powder, Al powder and C powder required for calculation is added to burn and synthesize self-made TiC, and the additive cryolite Na 2 AlF 6 The addition amount is 2wt.% of the total mass of raw material Ti powder, Al powder and C powder according to the calculation, additive Na 2 AlF 6 The quality of Al in should be included in the quality of Al in the total ratio of raw materials. Use anhydrous ethanol as the medium to ball mill on a planetary ball mill for 8 hours at 70°C or dry naturally, then ignite the reactants with a tungsten wire loop under the protection of argon, and cool naturally, the product is Ti 2 AlC powder.

[0026] In this example, the addition amount of self-made TiC by combustion synthesis is changed to 5wt.% and 25wt.% of the total mass of Ti powder, Al powder and C powder required respectively, and the other conditions remain unch...

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Abstract

The invention relates to a method for preparing high performance Ti2AIC ceramic powder, comprising the following steps: proper amount of Ti powder, Al powder and C powder are provided with the mol ratio of Ti2AIC chemical formula featuring Ti:Al:C equaling to 2:1:1; additive cryolite Na2AIF6 is added by superaddition method, the additive Na2AIF6 is added according to 0.1-25wt. % of the total mass of Ti powder, AI powder and C powder, mass of AI in Na2AIF6 is reckoned in the mass of AI in the mol ratio of Ti:Al:C being equal to 2:1:1; the material and additive powder is placed in a grinder to be ground; meanwhile, moderate amount of absolute ethyl alcohol is added to the grinder for carrying out wet mixing for 6-12 hours; the mixture is taken out for either natural drying or baking at the temperature of 60-80 DEG C to obtain the evenly mixed raw material powder; the evenly mixed raw material powder is placed in a cylindrical-tile-shaped material boat and is placed in a combustion synthesis system; titanium carbon mixture is placed at an ignition part in front of the material powder as ignition powder; with the protection of argon, electrified tungsten filament ring is used for igniting the reactant, after natural cooling, the obtained product is Ti2AIC powder. Compared with existing similar technology, the method of the invention features simple process, low cost and easy industrialization.

Description

technical field [0001] The present invention relates to a kind of high-performance Ti 2 A method for preparing AlC ceramic powder. Background technique [0002] Ti 2 AlC is a layered ceramic material with both metal and ceramic properties, new structure, functional integration and machinability. Its outstanding properties include: good thermal conductivity, electrical conductivity and resistance to damage at room temperature; excellent thermal shock resistance and high temperature oxidation resistance; easy processing with convenient tools, low density, high melting point, high strength, high Young's modulus volume and high shear modulus. Ti 2 These unique properties of AlC are related to the simultaneous presence of metallic bonds, covalent bonds and ionic bonds in its crystal structure. [0003] Ti 2 AlC has a wide range of uses in high-temperature structural components, chemical anti-corrosion materials, electrode materials, electronics industry, machinable ceramic ...

Claims

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Application Information

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IPC IPC(8): C04B35/626C04B35/56
Inventor 郭俊明陈克新刘贵阳张虹王宝森张黎黎
Owner HONGHE COLLEGE
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