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Method for preparing heterogeneity metallic coating by arc spraying

An arc spraying and dissimilar metal technology, which is used in the field of arc spraying to prepare dissimilar metal coatings and metal wire arc spraying, and can solve problems such as single coating

Inactive Publication Date: 2011-02-09
WUHAN RES INST OF MATERIALS PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing dissimilar metal coatings by arc spraying, which solves the problem that the current arc spraying method can only spray the same kind of metal wires and prepare a single coating, thereby satisfying the need for multiple functions in the field of surface engineering Requirements for permanent arc spray coatings

Method used

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  • Method for preparing heterogeneity metallic coating by arc spraying
  • Method for preparing heterogeneity metallic coating by arc spraying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1 Arc sprayed iron-copper coating

[0015] Iron-copper coating is a kind of coating that is both wear-resistant and wear-reducing. In order to obtain this coating, it can be prepared by electroplating, ion sputtering and other methods. However, these methods have low coating deposition efficiency and high cost. We adopt the method of the present invention to prepare iron-copper coating by arc spraying, which has simple process, low cost, and is energy-saving and environmentally friendly. The melting point of iron is 1500°C, and the melting point of copper is 1090°C. Both metals are high-melting materials. The difference between the melting points of the two metals is 500°C. Adjust the radius ratio of the iron and copper wire feed wheels to 1.0:1.1, that is, copper wire. The wire feeding speed is 1.1 times of the wire feeding speed of the iron wire. In this way, the spraying process is stable. An iron-copper coating with 55.7% copper and 44.3% iron is obtained.

Embodiment 2

[0016] Example 2 Arc spraying zinc-aluminum coating

[0017] Using this method for arc spraying zinc-aluminum coatings, the melting point of zinc is 429°C, and the melting point of aluminum is 660°C. Both zinc and aluminum are low-melting metals, and the difference in melting point between the two is less than 300°C. The radius ratio is 1:1.1. The radius of the wire feed wheel of the metal zinc wire is slightly larger than that of the metal aluminum wire. The arc device continues to operate normally, and the obtained zinc-aluminum coating has an aluminum content of 27.4%. The zinc content is 72.6%. The coating has passed the 2000-hour salt spray test, and has better anti-corrosion performance than a single zinc coating or a single aluminum coating. It has been successfully applied in anti-corrosion projects.

Embodiment 3

[0018] Example 3 Arc spraying aluminum-iron coating

[0019] Arc spraying aluminum-iron coatings are mainly used to prepare wear-resistant magnetic thermal functional coatings. The melting point of aluminum is 429°C, the melting point of iron is 1500°C, and the difference between the melting points of aluminum and iron exceeds 1000°C. For this reason, when performing arc spraying, adjust the radius ratio of aluminum to iron wire feeder to 3:1. That is to control the wire feeding speed of the aluminum wire to be 3 times that of the iron wire, the arc device continues to operate normally, and the aluminum-iron coating with 50.9% aluminum and 49.1% iron is obtained, which provides a kind of industrial production The required wear-resistant spray coating.

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Abstract

The invention relates to a method for using electric arc spraying to prepare dissimilar metallic coating, which belongs to the metal hot spraying field. The method comprises following steps: controlling the radius ratio of two wire feeding wheels to be 1:1-1:5 according to the difference of the melting point temperature value of metal wires which are transmitted by the two wire feeding wheels, adopting a wire feeding wheel with comparatively big diameter to transmit the metal wires with a comparatively low melting point, adopting the wire feeding wheel with comparatively small diameter to transmit the metal wires with a comparatively high melting point, guaranteeing that two species of metal wires with different melting points strike arcs to discharge electricity stably and an electric arc spraying works continuously and normally, and thereby obtaining functional electric arc spraying coating which is set to satisfy actual demands in industrial production, and the method of the invention has prominent advantages that single metal wire electric arcs can be directly adopted to prepare alloy coating or pseudo-alloy coating, the key problems which restrict the development of preparingspecial functional alloy or pseudo-alloy coating with an electric arc spraying method are broken through, and the method provides a practical and feasible method for more widely applying the electricarc spraying in the fields such as surface engineering, mechanical engineering and the like.

Description

Technical field [0001] The invention relates to a method for preparing dissimilar metal coatings by arc spraying, which belongs to the field of thermal spraying, and in particular relates to a metal wire arc spraying method. Background technique [0002] Arc spraying is a thermal spraying process developed in the late 1980s and early 1990s. The outstanding features of arc spraying are the use of clean electric energy, high energy efficiency, no pollution to the environment, high spraying efficiency, high utilization rate of spraying materials, good process controllability, and simple operation. [0003] The arc spraying method is to use two wire feed wheels with the same radius. Under the same speed condition, two identical conductive metal wires are continuously transported. When the two metal wires are in contact, the resistance heat and short circuit current will The metal wire melts, and at the same time, it is sprayed onto the substrate under the action of the atomizing airfl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/12C23C4/06C23C4/08C23C4/131
Inventor 李秉忠李朋董志红张海成
Owner WUHAN RES INST OF MATERIALS PROTECTION