Method for preparing surface plasma nitrided layer of high-entropy alloy

Abstract

The invention provides a method for preparing a surface plasma nitrided layer of a high-entropy alloy. The method comprises the steps that a high-entropy alloy base material is cleaned, a part is dried in a plasma nitriding furnace; and after the inner pressure and the outer pressure of the plasma nitriding furnace are identical, the part is placed on a cathode disk, vacuumizing is conducted on a furnace body, high-purity ammonia gas is fed into the furnace body, the temperature is raised and then kept, feeding of the ammonia gas is cut off, vacuumizing continues to be conducted, and the surface plasma nitrided layer of the high-entropy alloy is obtained after furnace cooling. According to the method for preparing the surface plasma nitrided layer of the high-entropy alloy, the LDMC-100A type pulse plasma nitriding furnace and the double glow plasma nitriding technology are utilized to conduct nitriding on the surface of the high-entropy alloy for the first time; the method for preparing the surface plasma nitrided layer of the high-entropy alloy has the advantages that the plasma nitrided layer is thick, high in combination strength and hardness and resistant to wear and corrosion; besides, the method for preparing the surface plasma nitrided layer of the high-entropy alloy has the advantages that the nitriding speed is high, the nitrided layer has good performance, technological deformation is small, and gas consumption and electricity consumption are small; and the method for preparing the surface plasma nitrided layer of the high-entropy alloy is a non-pollution nuisance-free ideal technology, and the surface plasma nitrided layer of the high-entropy alloy can be widely applied to the working conditions having a high wear resistance requirement and a high corrosion-resistance requirement.

Description

technical field [0001] The invention relates to a method for an ion nitriding layer on the surface of a high-entropy alloy, in particular to a method for preparing an ion nitriding layer on the surface of a high-entropy alloy. Background technique [0002] Ion nitriding is an important part of the surface treatment of metal materials. It can endow parts with various special functions such as high hardness, wear resistance, high temperature resistance, corrosion resistance, oxidation resistance, fatigue resistance, and radiation protection. A surface strengthening method that saves energy and resources and obtains significant economic benefits has been widely used in many fields. [0003] High-entropy alloy is a new type of alloy material designed by Ye Junwei, a Taiwanese scholar in the 1990s, based on the concept of equimolar ratio and high mixing entropy. It breaks the traditional design of preparing alloys based on one metal element. idea. Therefore, high-entropy alloys...

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Problems solved by technology

[0006] At present, the existing technologies use magnetron sputtering deposition, electrochemical deposition and laser cladding to prepare high-entropy alloy coatings and coat high-entropy alloy surfaces, but the coatings and coatings obtained by these methods are very thin. And the bonding force with the matrix is ​​not strong, it is easy to fall off, and it is difficult to take advantage of the performance of high-entropy alloys

[0007] In the existing technology, some alloys also use plasma nitriding, ion implantation, PCVD / CVD technology to prepare modified layers on the surface of the alloy, which significantly improves the hardness, wear resistance and corrosion resistance of the matrix, but the strengthening layer is relatively thin , the performance is relatively single, and the workpiece is prone to deformation, which brings many restrictions to the application of related technologies

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