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Atmospheric synthetic method for high purity titamum aluminum carbide ceramic powder

A technology of aluminum-titanium carbide and ceramic powders is applied in the field of atmospheric synthesis of high-purity aluminum-titanium carbide Ti3AlC2 ceramic powders, which can solve the problems of severe temperature fluctuations in the furnace, unstable process parameters, and influence on the purity of the composites. The effect of reducing high temperature loss, easy stabilization of sintering process parameters, and short synthesis time

Inactive Publication Date: 2007-04-11
BEIJING JIAOTONG UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0007] 1) During the reaction process, Ti and C react to release a large amount of heat, which leads to the phenomenon of "thermal explosion" in the system, which increases the temperature of the system and causes serious Al volatilization loss, thus changing the reaction ratio of each element in the system and affecting the synthesis Purity
[0008] 2) The "hot explosion" phenomenon causes severe temperature fluctuations in the furnace and damages the heating parts in the furnace
[0010] 4) During combustion synthesis, the temperature is not easy to control, and the process parameters are unstable

Method used

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  • Atmospheric synthetic method for high purity titamum aluminum carbide ceramic powder

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Experimental program
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Embodiment approach 1

[0026] 1) According to the molar ratio of Ti:Al:TiC:Sn=1:1:1:0.1, weigh 24.6 grams of Ti powder, 13.9 grams of Al powder, 30.8 grams of TiC powder, and 6.1 grams of Sn powder.

[0027] 2) Put the above ingredients into a ball mill tank and mix for 5 hours.

[0028] 3) Press the homogeneously mixed ingredients into a block under a pressure of 10 MPa.

[0029] 4) Put the above briquette into a high-temperature furnace, protect the atmosphere with argon gas, raise the temperature of the furnace to 1350°C at a heating rate of 30°C / min, and keep the holding time for 15min to obtain high-purity Ti 3 AlC 2 Powder, the X-ray diffraction (XRD) pattern of powder is shown in accompanying drawing 1. It can be seen from the figure that the product has high purity, and there is no impurity phase such as TiC in the XRD pattern.

Embodiment approach 2

[0031] 1) According to the molar ratio of Ti:Al:TiC:Sn=1:1:1:0.1, weigh 24.6 grams of Ti powder, 13.9 grams of Al powder, 30.8 grams of TiC powder, and 6.1 grams of Sn powder.

[0032] 2) Put the above ingredients into a ball mill tank and mix for 5 hours.

[0033] 3) Press the homogeneously mixed ingredients into a block under a pressure of 10 MPa.

[0034]4) Put the above briquette into a high-temperature furnace, protect the atmosphere with argon gas, raise the temperature of the furnace to 1400°C at a heating rate of 40°C / min, and hold the temperature for 10 minutes to obtain high-purity Ti 3 AlC 2 Powder, its XRD result is identical with embodiment one.

Embodiment approach 3

[0036] 1) According to the molar ratio of Ti:Al:TiC:Sn=1:1:1:0.15, weigh 28.7 grams of Ti powder, 16.2 grams of Al powder, 35.9 grams of TiC powder, and 10.7 grams of Sn powder.

[0037] 2) Put the above ingredients into a ball mill tank and mix for 6 hours.

[0038] 3) Press the homogeneously mixed ingredients into a block under a pressure of 30 MPa.

[0039] 4) Put the above briquette into a high-temperature furnace, protect the atmosphere with argon gas, raise the temperature of the furnace to 1450°C at a heating rate of 40°C / min, and hold the temperature for 15 minutes to obtain high-purity Ti 3 AlC 2 Powder, its XRD result is identical with embodiment one.

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Abstract

The present invention discloses atmospheric synthesis process of high purity titanium aluminum carbide (Ti3AlC2) ceramic powder. High purity Ti3AlC2 ceramic powder is prepared through mixing Ti powder, Al powder, TiC powder and Sn as reaction assistant in the molar ratio of 1 to 1 to 1 to (0.1-0.2) for 5-10 hr; pressing at 10-50 MPa into block; and sintering in a high temperature furnace under protection of argon in the temperature raising rate of 15-50 deg.c / min and through maintaining at 1350-1550 deg.c for 5-15 min. The present invention has the advantages of simple apparatus, stable technological parameters, short Ti3AlC2 powder preparing period, high product purity and low cost, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a preparation method of ceramic powder, especially high-purity aluminum carbide titanium Ti 3 AlC 2 Atmospheric pressure synthesis method of ceramic powder. Background technique [0002] Aluminum Carbide Titanium Ti 3 AlC 2 It has excellent properties such as high electrical conductivity, high thermal conductivity, oxidation resistance, thermal shock resistance, corrosion resistance, self-lubrication, and easy processing. This new type of layered ternary carbide combines the advantages of metal and ceramics, and integrates structure and function. It can be widely used in aerospace, petrochemical, transportation, new energy, electronic information and other fields. [0003] At present, most studies focus on the preparation of Ti by hot pressing and hot isostatic pressing. 3 AlC 2 Dense bulk material. Literature (J.Am.Ceram.Soc., 2000; 83[4]: 825) reports that Ti powder, Al 4 C 3 Ti powder and graphite powder were used a...

Claims

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Application Information

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IPC IPC(8): C04B35/56C04B35/65
Inventor 李世波向卫华贝国平翟洪祥周洋
Owner BEIJING JIAOTONG UNIV
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