Preparing method of metal material surface nitriding deposition composite antifriction wear-resisting modification layer

Abstract

The invention discloses a preparing method of a metal material surface nitriding deposition composite antifriction wear-resisting modification layer, and belongs to the technical field of metal material surface treatment. A metal material workpiece surface is rubbed down, polished and cleaned, and is then placed on an anode potential platform in a hollow cathode discharge ion source nitriding furnace, the interior of the furnace is vacuumized to 10 Pa to 15 Pa, ammonia gas is inflated into the furnace, the work pressure is maintained to 100 Pa to 500 Pa, heat preservation nitriding is carried out for 8 h at the temperature of 440 DEG C to 520 DEG C, and after cooling, the nitriding deposition composite antifriction wear-resisting modification layer is obtained. A sample is located at the anode potential, ion bombardment is not needed, nitrogen atoms can permeate into an austenite matrix to form a nitriding reinforcing layer, the problem about the edge effect can be effectively solved, the hardness of the whole surface is uniform, after a metal workpiece is subject to anode nitriding, a nitriding deposition layer is formed on the surface, and the antifriction wear-resisting property is obviously improved.

Description

technical field

[0001] The invention belongs to the technical field of metal material surface treatment, and in particular relates to a preparation method of a metal material surface nitriding deposition compound anti-friction and wear-resisting modified layer. Background technique

[0002] Due to the dense passivation film on the surface, austenitic stainless steel has excellent corrosion resistance in oxidizing media. However, due to its low surface hardness and poor wear resistance, it will fail due to severe wear in practical applications. Nitriding is widely used as an important engineering technology to improve the surface hardness and wear resistance of austenitic stainless steel. AISI 316 austenitic stainless steel is treated with low-temperature ion nitriding technology, the precipitation of nitrides is completely suppressed, and a single-phase nitrided layer is obtained. XRD shows that the diffraction peaks of the original austenite matrix shift to lower angles, ...

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