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Method for preparing high performance Ti3AIC2 ceramic powder

A ceramic powder, high-performance technology, applied in the field of preparation of new structural ceramic materials, can solve the problems of complex process flow, harsh synthesis conditions, and high preparation temperature, and achieve the effects of uniform reaction process, uniform and stable properties, and low cost.

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

However, the synthesis conditions are relatively harsh, the preparation temperature is high, the reaction time is long, and it is difficult to prepare large-sized materials. Ti is prepared by hot pressing, hot isostatic pressing, and discharge plasma sintering. 3 AlC 2 If the bulk material is ground into powder, the cost increases and the process is complicated, which greatly limits the promotion and application of the material, and it is difficult to form industrialization and industrialization. Moreover, after repeated heating for a long time, the texture of the material is coarse , leading to a decrease in its mechanical properties
In addition, since the metal components are relatively easy to melt and segregate during hot pressing and sintering, and are lost by evaporation, it is relatively difficult to control the components.

Method used

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  • Method for preparing high performance Ti3AIC2 ceramic powder
  • Method for preparing high performance Ti3AIC2 ceramic powder
  • Method for preparing high performance Ti3AIC2 ceramic powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 22.1418g of Ti powder with a purity greater than 99.7wt.%, 4.1602g of 99.6wt.% Al powder, and 3.6980g of 99.5wt.% carbon black with a molar ratio of Ti:Al:C of 3:1:2. The additive NaF is Ti, 10 wt.% of the total mass of Al and C (30 g) was added to 3.0000 g. 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 3 AlC 2 Powder.

[0023] The X-ray diffraction analysis detection result of the product obtained in this example is shown in figure 1 , at a diffraction angle 2θ of 9.5 0 There is Ti 3 AlC 2 The characteristic peaks, suggesting that the synthesis is Ti 3 AlC 2 substance.

[0024] In this example, when the additive NaF is added at 0.5wt.% and 20wt.% of the total mass (30g) of Ti, Al and C, respectively, the obtained results are roughly the same.

Embodiment 2

[0026] Under the condition of keeping the molar ratio of Ti:Al:C 3:1:2 unchanged, weigh 17.3438g of Ti powder with a purity greater than 99.7wt.%, 4.1602g of 99.6wt.% Al powder, and 2.4960g of 99.5wt.% carbon black 20wt.% of the total mass of the system (30g) was added to burn and synthesize homemade TiC6.0000g, and the NaF additive was added according to 3wt.% of the total mass of Ti, Al, C and TiC (30g), which was 0.9000g. 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 3 AlC 2 Powder.

[0027] Ti 3 AlC 2 The powder is put into a φ50mm graphite mold, and sintered by hot pressing at 1400°C and 25Mpa, with argon as the protective atmosphere. The heating process is as follows: the temperature is raised to 1200°C in 30 minutes, the temperature is raised to 1400°C after half an hour, a...

Embodiment 3

[0034] According to Ti: Al: C molar ratio 3: 1.2: 2, weigh the purity greater than 99.7wt.% Ti powder 21.5442g, 99.6wt.% Al powder 4.8576g and 99.5wt.% carbon black 3.5982g, NaF additive according to Ti, Al and 5 wt.% of the total mass of C (30 g) was added to 1.5000 g. 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 obtained product is Ti 3 AlC 2 Powder.

[0035] In this example, the molar ratios of Ti:Al:C were changed to 3:1:1.8, 3:1.3:1.8 and 3:1.3:2.0 respectively, and the obtained products were basically the same when other conditions remained unchanged.

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Abstract

The invention relates to a method for preparing high performance Ti3AIC2 ceramic powder, comprising the following steps: Ti powder, Al powder and C powder are provided with the mol ratio of Ti3AIC2 chemical formula featuring Ti:Al:C equaling to 3:1:2; additive NaF is added by superaddition method to control purity of Ti3AIC2; NaF recruitment is 0.5-20wt.% of the total quality of Ti powder, AI powder and C powder; the material and additive powder are placed in a ball-milling jar, absolute ethyl alcohol is added to the ball-milling jar for carrying out wet mixing for 4-12 hours; material powder is obtained either by natural drying or by baking at the temperature of 60-80 DEG C; the material powder is placed in a cylindrical-tile-shaped material boat and 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 Ti3AIC2 powder. The invention is characterized by rapid reaction, simple process, low cost, direct use of low-melting-point material as the material of the reactant, no generation of melting and reunion thereof, uniform reaction course, easy control and uniform and stable property of the synthetized Ti3AIC2.

Description

technical field [0001] The present invention relates to a kind of preparation method of novel structural ceramic material, promptly prepares high-performance Ti 3 AlC 2 method of ceramic powder. Also known as self-propagating high temperature synthetic Ti 3 AlC 2 method of ceramic powder. Background technique [0002] Ti 3 AlC 2 It is a kind of machinable ceramic material that combines the excellent properties of metal and ceramics. For example, like metal, it is an excellent conductor of heat and electricity, has low Vickers hardness and high modulus of elasticity and shear modulus, can be machined like metal and graphite, is relatively soft, and resists heat It has good shock resistance and has certain plasticity at higher temperatures; like ceramics, it has high melting point, high modulus, low specific gravity, high temperature strength and good oxidation resistance. Moreover, they have even better than graphite and MoS 2 The self-lubricating properties, especia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/626C04B35/56
Inventor 郭俊明陈克新王宝森刘贵阳张虹
Owner HONGHE COLLEGE
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