Special alloy powder for continuous wave fiber laser cladding

Abstract

The invention discloses a special alloy powder for continuous wave fiber laser cladding. The special alloy powder contains the following components in percentage by weight: 11-13% of titanium carbide, 2-5% of lanthanum oxide, 5-7% of aluminum oxide, 8-10% of chromium, 2-4% of iridium, 0.1-0.2% of carbon, 1-1.2% of manganese and the balance of nickel. The alloy powder is specially used for the cladding process of a high-energy continuous fiber laser, the absorption and utilization ratios of laser are remarkably increased, and the formed cladding layer has high hardness, high toughness and high corrosion resistance. The cladding layer is compact in tissue and free of defects such as pores, cracks, shrinkage holes and the like; when the alloy powder is used for laser cladding, the process is simple and convenient, and heat treatment before and after cladding is not needed.

Description

technical field [0001] The invention relates to an alloy powder, in particular to an alloy powder specially used for continuous wave optical fiber laser cladding. Background technique [0002] Laser cladding is one of the surface treatment technologies. In a nutshell, the principle of laser cladding is to use high-energy laser beams to irradiate the surface of metal materials, the surface of the substrate is melted rapidly, the liquid metal forms a small-scale molten pool, and new powder materials are filled at the same time. , the original metal material is mixed with the added powder to form a new layer of liquid metal. After the laser beam passes through, the liquid metal layer is rapidly cooled to form a solid cladding layer on the metal surface. With the continuous improvement of laser power and stability, it has been rapidly promoted and applied. Laser cladding technology can be widely used in aviation, national defense, petrochemical, metallurgy, medical equipment ...

AI Technical Summary

Problems solved by technology

[0003] However, there are almost no special alloy powders for continuous fiber laser cladding on the domestic market at present, and most of the alloy powders used are self-fluxing alloy powders for thermal spraying

Due to the difference in heat transfer methods and process conditions of the two technologies, the laser absorption rate is low after the self-fluxing alloy powder used in thermal spraying is directly used in continuous fiber laser cladding, generally around 30-40%.

Moreover, the cladding layer is prone to defects such as cracks, shrinkage porosity, shrinkage cavities, and pores.

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