Constant pressure synthesis method for aluminum chromium carbide ceramic powder

A technology for the synthesis of ceramic powders at atmospheric pressure, which is applied in the field of atmospheric pressure synthesis of low-cost, high-purity aluminum carbide, chromium, Cr2AlC ceramic powders, and can solve the problems of component electrical conductivity, anti-oxidation, and processability. The effect of easy control of process parameters, low price and stable process parameters

Inactive Publication Date: 2008-09-17
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because Cr 2 If there are impurity phases such as chromium carbide in AlC powder, it will have an adverse effect on the electrical conductivity, oxidation resistance and machinability of the component.

Method used

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  • Constant pressure synthesis method for aluminum chromium carbide ceramic powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) According to the molar ratio of Cr:Al:C=2:1:1, weigh 36.37 grams of Cr powder, 9.43 grams of Al powder, and 4.2 grams of C powder;

[0020] 2) Put the above-mentioned ingredients into the ball mill tank and place on the ball mill for mixing for 10 hours;

[0021] 3) Place the uniformly mixed ingredients in a briquetting mold and press them into a block under a pressure of 30MPa;

[0022] 4) Put the above-mentioned briquette into a high-temperature furnace, and raise the temperature of the furnace to 1350° C. at a heating rate of 15° C. / min under an argon atmosphere, and the holding time is 30 minutes. That is, Cr 2 AlC powder, the XRD pattern of the powder is as follows figure 1 shown. It can be seen from the spectrum that the product has high purity and only Cr 2 Diffraction peaks of the AlC phase.

Embodiment 2

[0024] 1) According to the molar ratio of Cr:Al:C=2:1:1, weigh 36.37 grams of Cr powder, 9.43 grams of Al powder, and 4.2 grams of C powder;

[0025] 2) Put the above-mentioned ingredients into the ball mill tank and place on the ball mill for mixing for 10 hours;

[0026] 3) Place the uniformly mixed ingredients in a briquetting mold and press into a block under a pressure of 40MPa;

[0027] 4) Put the above-mentioned briquettes into a high-temperature furnace, and raise the temperature of the furnace to 1450° C. at a heating rate of 20° C. / min under an argon atmosphere, and the holding time is 20 minutes. That is, Cr 2 AlC powder, its XRD result is identical with embodiment 1.

Embodiment 3

[0029] 1) According to the molar ratio of Cr:Al:C=2:1:1, weigh 36.37 grams of Cr powder, 9.43 grams of Al powder, and 4.2 grams of C powder;

[0030] 2) Put the above-mentioned ingredients into the ball mill tank and place on the ball mill for mixing for 10 hours;

[0031] 3) Place the uniformly mixed ingredients in a briquetting mold and press them into a block under a pressure of 50MPa;

[0032] 4) Put the above-mentioned briquettes into a high-temperature furnace, and raise the temperature of the furnace to 1500° C. at a heating rate of 30° C. / min under an argon atmosphere, and the holding time is 5 minutes. That is, Cr 2 AlC powder, its XRD result is identical with embodiment 1.

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Abstract

The invention relates to a method for synthesizing aluminum chromium carbide powder under normal pressure. The method comprises the following steps: mixing Cr powder, Al powder and C powder as raw materials at the molar ratio of Cr to Al to C of 2:(1-1.3):1, stirring for 10 hours, molding under 30-50 MPa to obtain a blank block, heating the blank block up to 1350-1500 DEG C at a temperature rise rate of 15-50 DEG C/min in the presence of argon gas, and maintaining the temperature for 5-30 min, to obtain high-purity Cr2AlC powder with low cost. The method has the advantages of wide temperature range of Cr2AlC powder synthesis, short synthesis time, high purity, low cost, simple equipment, stable processing parameters, and suitability for bulk production.

Description

technical field [0001] The present invention relates to a kind of preparation method of ceramic material, especially low-cost high-purity aluminum chromium carbide Cr 2 Atmospheric pressure synthesis method of AlC ceramic powder. Background technique [0002] A new type of M composed of ternary carbides and nitrides belonging to the same hexagonal system n+1 AX n (where n=1, 2, 3; M is a transition metal, A is mainly III and IVA main group elements, X is C or N) materials, showing high electrical conductivity, high thermal conductivity, oxidation resistance, thermal shock resistance, Corrosion resistance, self-lubrication, easy processing and other excellent properties. [0003] in M n+1 AX n In the family, Cr 2 AlC has better high temperature oxidation and hot corrosion resistance, mainly because Cr 2 AlC is easy to form Al in the process of high temperature oxidation and corrosion 2 o 3 and Cr 2 o 3 Dense protective film. Therefore, Cr 2 As a high-temperature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/622
Inventor 李世波贝国平翟洪祥周洋
Owner BEIJING JIAOTONG UNIV
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