Efficient and high-quality nickel-based high-temperature alloy surface salt bath chromizing agent and process thereof

Abstract

The invention provides an efficient and high-quality nickel-based high-temperature alloy surface salt bath chromizing agent and a process thereof. A nickel-based high-temperature alloy surface chromizing layer which is rapid in permeation speed, thick and uniform in permeation layer and low in cost, and is simple and feasible can be obtained by a salt bath process. The efficient and high-quality nickel-based high-temperature alloy surface salt bath chromizing agent is prepared from boric oxide (B2O3), sodium fluoride (NaF), boron carbide (B4C), barium chloride (BaC12), chrome oxide (Cr2O3) and aluminum (Al) according to a certain mass percentage; the materials are added into a resistance furnace; the process comprises the following steps: polishing the nickel-based high-temperature alloy surface, washing, then putting the nickel-based high-temperature alloy surface into a crucible filled with salt bath agents, keeping the temperature for 4 hours in the environment at 900-950 DEG C, and chromizing. Compared with the untreated substrate (290HV), the hardness of the finally obtained nickel-based high-temperature alloy surface is improved by three times. The process is used as a method for modifying the nickel-based high-temperature alloy surface; the material surface hardness is improved; the service life is prolonged; the application range is expanded; the efficient and high-quality nickel-based high-temperature alloy surface salt bath chromizing agent has more extensive application prospects in the fields such as aerospace and petrochemical industry and the like.

Description

technical field [0001] The invention relates to a high-efficiency, high-quality nickel-based superalloy surface salt-bath chromizing process, specifically a method of chemical thermal diffusion reaction deposition on the surface of a nickel-based superalloy with large thickness, dense surface and less sticky salt The chromizing layer can improve the surface hardness of the material at the same time. Background technique [0002] Superalloys have good high-temperature strength, fracture toughness, fatigue properties and certain resistance to high-temperature oxidation and corrosion, so they are widely used in aerospace, atomic energy, petrochemical, coastal operations and other fields. As the most widely used superalloy, nickel-based superalloys meet the needs of turbine engine blades with high strength, good toughness, and good corrosion resistance and oxidation resistance at high temperatures, so they are widely used as blade materials. However, as the environment where hi...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a high-efficiency, high-quality nickel-based superalloy surface salt-bath chromizing formula and preparation process for the application defects of current nickel-based superalloys that cannot withstand high-temperature corrosion and oxidation. The permeation speed and the surface hardness of the material, and the thickness of the permeation layer is large, the surface of the permeation layer is dense, and there is less sticky salt. At the same time, it has the characteristics of simple operation, easy realization, and excellent economy.

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