Preparation method of aluminum-containing alloy coating in atmospheric atmosphere

An aluminum alloy and alloy technology, which is applied in the field of preparation of aluminum alloy-containing coatings in atmospheric atmosphere, can solve the problems of poor coating quality, difficult to guarantee coating quality consistency and uniformity, etc.

Active Publication Date: 2021-01-15
XI AN JIAOTONG UNIV
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Problems solved by technology

[0006] The embodiment of the present invention provides a preparation method of an aluminum alloy-containing coating in an atmospheric atmosphere to solve the poor coating quality caused by the oxidation of aluminum-containing molten particles in the current plasma spraying, and it is difficult to guarantee the consistency and uniformity of the coating quality The problem

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  • Preparation method of aluminum-containing alloy coating in atmospheric atmosphere
  • Preparation method of aluminum-containing alloy coating in atmospheric atmosphere
  • Preparation method of aluminum-containing alloy coating in atmospheric atmosphere

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preparation example Construction

[0032] Aiming at the technical problem of the present invention, the embodiment of the present invention provides a method for preparing an aluminum alloy coating under an atmospheric atmosphere, referring to figure 1 , which may specifically include the following steps:

[0033] Step S101, preparing a metal powder to be sprayed, the metal powder including a base alloy containing aluminum elements and a carbon source present in the base alloy containing aluminum elements in different forms;

[0034] Wherein, the basic alloy containing aluminum elements includes alloy matrix phase elements, elemental metal elements, and auxiliary components. Specifically, the basic alloy containing aluminum elements includes aluminum-based alloys, metal alloys containing aluminum alloy elements, aluminum and The other metal forms at least one of an alloy of an intermetallic compound and an alloy of an aluminide-containing intermetallic compound. Wherein, the aluminum-based alloy includes pure ...

Embodiment 1

[0043] Pure aluminum (Al) powder is used, and micron-scale tungsten carbide (WC) particles are used as carbon source to prepare Al-WC metal powder containing 15wt% WC through mechanical alloying, and the particle size of the powder is 30-60 μm. Al-WC metal powder was sprayed by atmospheric plasma, and the aluminum-based coating was prepared under the condition of arc power of 30kW. Observation of the aluminum-based coating shows that the cross-section structure of the coating is dense, and the existence of oxides is not observed in the structure. It should be noted that the content of 15wt% refers to the content of tungsten carbide, and the carbon content at this time is still between 1wt% and 10wt%.

Embodiment 2

[0045] The metal powder prepared in the embodiment of the present invention is a Ni-Al composite powder with a size of 15-37 μm and containing 2 wt % of micron-sized diamond. The Ni-Al composite powder was sprayed by atmospheric plasma, and the Ni-Al based coating was prepared under the condition of arc power of 36kW. Coating section structure such as figure 2 and image 3 As shown, the coating was found to be dense without obvious oxide inclusions.

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Abstract

The embodiment of the invention discloses a preparation method of an aluminum-containing alloy coating in an atmospheric atmosphere, and relates to the technical field of high-temperature plasma application and the field of material protection. The preparation method comprises the steps that firstly, to-be-sprayed metal powder is prepared, wherein the metal powder comprises a base alloy containingan aluminum element and a carbon source existing in the base alloy containing the aluminum element in different forms; secondly, the metal powder is fed into a high-temperature plasma jet flow in theatmosphere, so that the metal powder is heated to a molten state exceeding 2000 DEG C through the high-temperature plasma jet flow and deposited on the surface of the base body to form the aluminum-containing alloy coating which is consistent and uniform in coating quality; in the process that the metal powder is heated to the molten state through the high-temperature plasma jet flow, the aluminum element in the metal powder is preferentially oxidized, and aluminum oxide is formed; and when the metal powder is heated to be higher than 2000 DEG C, the carbon source is preferentially oxidized to form a carbon-oxygen compound to volatilize, and meanwhile the carbon source reduces aluminum oxide formed in the earlier stage into an aluminum elementary substance.

Description

technical field [0001] The invention relates to the technical field of high-temperature plasma application and the field of material protection, in particular to a preparation method of an aluminum alloy-containing coating under an atmospheric atmosphere. Background technique [0002] Plasma spraying uses a high-speed high-temperature plasma jet with a temperature of about 3000° to 10,000°C to heat the powder particles fed into it to a completely melted or semi-melted state, accelerate the formation of a high-speed droplet flow, and spray the high-speed droplet flow to the The surface of the substrate is a method of depositing a high-speed droplet flow on the surface of the substrate to form a coating. [0003] When plasma spraying is carried out in a large atmosphere, when the high-temperature plasma jet is ejected from the spray gun and flies in the atmosphere at high speed, it will naturally involve atmospheric components. As the distance between the jet and the spray gu...

Claims

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Application Information

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IPC IPC(8): C23C4/134C23C4/067
CPCC23C4/067C23C4/134
Inventor 李长久张黎雒晓涛李成新
Owner XI AN JIAOTONG UNIV
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