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Preparation method for NiCrAl foam metal

A foam metal and foam technology is applied in the field of electrothermal alloy preparation, which can solve the problems of difficult alloy performance, low density, high apparent resistivity, etc.

Inactive Publication Date: 2017-05-31
CHANGDE LYRUN MATERIAL
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AI Technical Summary

Problems solved by technology

There are many studies on the above series of electrothermal alloys. Due to the limitations of traditional element composition and preparation technology, it is difficult to further improve the performance of the alloy. It is urgent to develop a new electrothermal alloy material to meet practical applications.
Metal foam materials have excellent properties such as low density, high specific surface area, and high apparent resistivity, and have broad application prospects in fluid heating and electrothermal catalysis. In the prior art, porous Al discs are used as heating elements to make air heating However, there are very few reports on the use of metal foam as an electrothermal material to study its preparation process and electrical properties.

Method used

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  • Preparation method for NiCrAl foam metal

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Embodiment Construction

[0015] Further illustrate and understand the present invention through embodiment below.

[0016] The preparation method of NiCrAl foam metal adopts sintering process to prepare foam NiCr alloy, on the basis of foam NiCr alloy, adopts powder embedding method to infiltrate Al, infiltrating agent is made of aluminum-nickel alloy powder, Al 2 O 3 Powder and NH 4 Cl composition, forming NiCrAl foam metal.

[0017] The sintering process includes:

[0018] ⑴Batching: according to the ratio of Cr: 26.6%, Fe: 2.7%, Mn: 0.7%, Nb: 0.8%, Mo: 1.4%, Zr: 4%, and the balance is nickel;

[0019] (2) Ball milling: After grinding in a high-energy ball mill for 14 hours, an alloy powder with an average particle size of 35 um is obtained;

[0020] (3) Sintering: put the mold filled with the above alloy powder into a sintering device, and sinter under vacuum conditions while pressurizing, the sintering temperature is 1260°C, and the time is 2.5 hours to obtain a foamed NiCr alloy.

[0021] Th...

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Abstract

The invention relates to a preparation method for NiCrAl foam metal. The preparation method comprises the steps that a foam NiCr alloy is prepared through a sintering process, Al seeps through a powder embedding method based on the foam NiCr alloy, a permeating agent is composed of aluminum and nickel alloy powder, AI2O3 powder and NH 4CI, and the NiCrAl foam metal is formed. The preparation method overcomes the defects of a traditional electrothermal alloy, and the produced NiCrAl foam metal has excellent oxidation resistance and specific resistance.

Description

technical field [0001] The invention relates to a method for preparing an electrothermal alloy, in particular to a method for preparing NiCrAl foam metal. Background technique [0002] Electrothermal alloy materials are resistance alloys that use the resistance properties of substances to manufacture heating elements. At present, electrothermal alloy materials have become an important engineering material, suitable for machinery, metallurgy, electronics, chemical industry and other industries, and occupy an important position in the national economy. According to their chemical composition, they can be divided into nickel-chromium alloy, nickel-chromium-iron alloy and iron alloy. Three series of chrome aluminum alloy. There are many studies on the above series of electrothermal alloys. Due to the limitations of traditional element composition and preparation process, it is difficult to further improve the properties of the alloys. It is urgent to develop a new electrotherma...

Claims

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Application Information

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IPC IPC(8): C22C1/08C22C19/03
CPCC22C1/08C22C19/03
Inventor 余兴华易秋珍钟建夫朱济群
Owner CHANGDE LYRUN MATERIAL
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