Special metal ceramic alloy powder for continuous wave fiber laser cladding

Abstract

The invention discloses special metal ceramic alloy powder, matched with the characteristics of continuous fiber laser, for continuous wave fiber laser cladding. The metal ceramic alloy powder contains the following ingredients in percentage by weight: 11-13% of titanium carbide, 2-4% of lanthanum oxide, 5-8% of alumina, 2-4% of silicon nitride, 4-7% of silicon, 15-18% of molybdenum, 3-5% of boron, 0.1-0.2% of carbon and the balance of nickel and unavoidable impurities. The metal ceramic alloy powder is specially used for a cladding process of a high-energy continuous fiber laser, the absorption and utilization ratios of laser are improved obviously, and a formed cladding layer has high hardness, high toughness and high corrosion resistance; moreover, the tissue of the cladding layer is dense and is free from the defects of air holes, cracks, shrinkage cavities and the like; meanwhile, the dilution ratio can be controlled effectively, the process is simple and convenient, and heat treatment before / after cladding is not required.

Description

technical field [0001] The invention relates to an alloy powder, in particular to a cermet 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 equi...

AI Technical Summary

Problems solved by technology

[0003] However, there are almost no special cermet 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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