Magnesium-aluminum alloy surface laser cladding self-lubricating coating and construction method thereof

Abstract

The invention discloses a magnesium-aluminum alloy surface laser cladding self-lubricating coating and a construction method thereof, and relates to the technical field of magnesium-aluminum alloy processing. The magnesium-aluminum alloy surface laser cladding self-lubricating coating comprises a coated body, the coated body comprises a base body; and a transition coating and a cladding layer arecorrespondingly arranged on the surface of the base body from bottom to top. The construction method of the magnesium-aluminum alloy surface laser cladding self-lubricating coating comprises the following steps of SS001, prefabrication of coating materials and preparation of Ni-based alloy powder, TiB2 alloy powder and MoS2 alloy powder, and the weight percentage of the Ni-based alloy powder to the TiB2 alloy powder is 90% to 95%. Through the design of the transition coating, direct laser coating of a traditional magnesium-aluminum alloy is changed into indirect laser coating, during processing, through the design of the transition layer, the stress difference between a cladding layer and the base body can be effectively reduced, the heat conductivity and the thermal expansion coefficientof the cladding layer and the base body are close, and therefore thermal stress caused by the temperature gradient is reduced.

Description

technical field [0001] The invention belongs to the technical field of magnesium-aluminum alloy processing, and in particular relates to a laser cladding self-lubricating coating on the surface of magnesium-aluminum alloy and a construction method thereof. Background technique [0002] Magnesium-aluminum alloy has low density, high specific strength, good shock absorption and easy processing, and is widely used in aerospace, transportation, biomedicine and other fields. However, magnesium-aluminum alloys have low hardness, poor wear resistance and corrosion resistance, which limit their application in harsh environments. [0003] Material surface modification technology is to endow the surface with new properties such as high temperature resistance, corrosion resistance, wear resistance, and electrical conductivity on the premise of maintaining the original properties of the material, so as to improve the performance of the material in high-speed, high temperature, high pres...

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Problems solved by technology

[0007] The object of the present invention is to provide a kind of magnesium-aluminum alloy surface laser cladding self-lubricating coating and its construction method, through the preparation of the transition coating and cladding layer preparation and process design, solve the problem of existing magnesium-aluminum alloy surface laser The surface of the cladding process is prone to cracks, which leads to the problem of poor laser cladding effect

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