Powder core wire materials for preparing micro crystal and nanocrystalline coatings containing NiB by arc spraying

Abstract

The invention provides a NiB-containing microcrystal and nanocrystalline powder core wire for arc spraying. The powder core wire belongs to the field of hot spraying in material processing engineering, and is mainly used for anticorrosion and wearing resistance of 'four tubes' of a power plant boiler and so on. The microcrystal and the nanocrystalline crystalline state alloy is a crystalline state material with small grains formed by restructuring the internal structure of an amorphous state material at a high temperature, and is integration of high strength, hardness, toughness, wear resistance and corrosion resistance, but no patent report on microcrystal and nanocrystalline powder core wire is seen at home and abroad. The invention is a NiB-containing microcrystal and nanocrystalline powder core wire and is characterized by comprising the following powder core components in percentage by mass: 60 to 80 percent of nickel boride, 2 to 5 percent of Mo, 5 to 15 percent of WC, 2 to 5 percent of TiC and the balance being nickel powder. The coating prepared by the powder core wire can be decomposed to generate microcrystal and nanocrystalline during high-temperature spraying, and the coating is uniform in structure, high in hardness with HV0.1more than1000, and good in wear resistance, and the relative wear resistance can reach 14 times of that of Q235 steel.

Description

technical field [0001] The invention is a NiB-containing microcrystalline and nanocrystalline powder core wire material for arc spraying, which belongs to the field of thermal spraying in material processing engineering. It can be used in various industrial fields such as anti-corrosion and anti-wear. Background technique [0002] In coal-fired power plants, the high-temperature oxidation, sulfidation and thermal corrosion of the "four tubes" (water-cooled wall tubes, superheater tubes, reheater tubes, and economizer tubes) of high-temperature and high-pressure boilers and the resulting failures such as tube bursts It has always been a technical and economic problem urgently to be solved in the electric power industry. Among them, the high-temperature corrosion problem of the water-cooled wall will lead to large-scale thinning of the water-cooled wall and frequent explosions and leaks, causing the thermal power plant to be forced to shut down. In April 1991, after 2300 hou...

AI Technical Summary

Problems solved by technology

[0009] The ultimate goal to be achieved by the present invention is: use a kind of NiB-containing microcrystalline and nanocrystalline arc spray powder core wire material of the present invention to prepare arc spray coating, so that the coating has high temperature oxidation resistance and high temperature corrosion-abrasion resistance Good, solve the problem of high temperature oxidation corrosion and erosion wear on the tube wall of the converter hood, and ensure the safe operation of the converter in the steelmaking plant

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