High chromium aluminum type high wear resistant arc spraying powder core wire material

Abstract

The invention relates to a high-hardness high-wear-resistant metallic composite electric arc spraying powder core wire which belongs to abrasion-resistance electric arc spraying powder cored wires used for the surface protection of metal materials. The high-hardness high wear-resistant metal composite electric arc spraying powder core wire belongs to the field of hot spraying in material processing engineering, is mainly used for the corrosion prevention and the abrasion resistance of a heating surface of a boiler in an electric power plant and has low cost. The high-hardness high wear-resistant metal composite electric arc spraying powder cored wire is characterized by comprising the powder core components according to percentages by weight of 28-30 percent of crome metal, 5.0-10 percent of metallic aluminum, 0.5-1.5 percent of silicon, 1.0-3.0 percent of carbon, 0.5-2.0 percent of rare-earth, and the rest is metallic iron. A metallic composite coating prepared by the high-hardness high-wear-resistant metallic composite electric arc spraying powder core wire contains a compact chromic oxide film which has favorable high-temperature oxidation resisting property as well as corrosion resisting and abrasion resisting properties, good thermal conduction, high bonding strength, as high as 870 DEG C of working temperature, HV500-550 of microhardness range and more than 50MPa of bonding strength. A preparation method of the high-hardness high-wear-resistant metallic composite electric arc spraying powder core wire adopts the prior processes of firstly rolling a low-carbon cold-rolled strip into a U shape, adding powder core powders which account for 30-40 percent of the gross weight of spraying wires into the U-shaped groove, closing the U-shaped groove and wrapping the powder cores in the U-shaped groove, drawing gradually and lightening through a wire-drawing die to lead the diameter to reach 3.0mm.

Description

technical field [0001] The utility model relates to a high-hardness and high-wear-resistant metal composite arc spraying powder core wire material, which belongs to a wear-resistant arc spraying powder core wire material for metal material surface protection. The invention belongs to the field of thermal spraying in material processing engineering, and is mainly used for anti-corrosion and wear resistance of heating surfaces of boilers in power plants, and has low cost. Background technique [0002] When many equipment systems in the thermal energy and petrochemical industries are in operation, due to the existence of high-temperature airflow inside, the equipment not only contains a large amount of H 2 S, SO 2 And other corrosive media, and a large number of fine particles (such as catalysts, coal powder, etc.) are carried in the airflow. When this mixture of corrosive gases and particles passes through equipment systems at high temperatures and high speeds, it can cause ...

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Problems solved by technology

[0008] The problem to be solved by the present invention is: the performance of the arc sprayed coating prepared by the present invention is significantly improved compared with the surface of the pipe wall without spraying the product in terms of wear resistance, high temperature oxidation resistance and corrosion resistance, and solves the problem of the heat of the boiler in the power plant. Surface high temperature oxidation corrosion and particle erosion wear problems, to ensure the safe operation of power plant boilers

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