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Preparation method of NiCrAl foam metal

A foam metal and foam technology, which is applied in the field of electrothermal alloy preparation, can solve the problems of low density, high apparent resistivity, high specific surface area, etc., and achieve excellent oxidation resistance and resistivity, composition and phase distribution.

Active Publication Date: 2014-12-24
YANCHENG XINYANG ELECTROTHERMAL MATERIAL CO LTD
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Problems solved by technology

[0003] 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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Embodiment Construction

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

[0016] The preparation method of NiCrAl foam metal is characterized in that the foam NiCr alloy is prepared by a sintering process, and on the basis of the foam NiCr alloy, the powder embedding method is used to infiltrate Al, and the infiltration 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] (1) Ingredients: 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 μm was 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. for 2.5 hour...

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Abstract

The invention relates to a preparation method of an electrical heating alloy, and particularly relates to a preparation method of an NiCrAl foam metal. The preparation method comprises the following steps of: preparing a foam NiCr alloy by adopting a sintering process; aluminizing by adopting a powder embedding method on the basis of the foam NiCr alloy to form the NiCrAl foam metal, wherein a penetrating agent comprises nickel-aluminum alloy powder, Al2O3 powder and NH4Cl. The preparation method disclosed by the invention overcomes the defects of the traditional electrical heating alloy; and the produced NiCrAl foam metal has excellent oxidation resistance and resistivity.

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 electrother...

Claims

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Application Information

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IPC IPC(8): C22C1/08C23C10/48
Inventor 郭健郭小芳郭乃林
Owner YANCHENG XINYANG ELECTROTHERMAL MATERIAL CO LTD
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