Method for preparing high-temperature alloy cutting tool coating in ion source enhanced arc ion plating mode

Abstract

The invention discloses a method for preparing a high-temperature alloy cutting tool coating in an ion source enhanced arc ion plating mode. The method comprises the steps that a high-temperature alloy cutting tool is pretreated and then placed to a rotating stand rod in a vacuum chamber of ion source enhanced arc ion plating equipment, a rectangular arc Ti target serves as a bottom Ti source, and the sputtering rate of the arc Ti target is controlled by adjusting the current of the arc Ti target; a round arc CrAl target serves as a Cr and Al element source for preparing aCrAlN coating, and the sputtering rate of the arc CrAl target is controlled by adjusting the current of the arc CrAl target; high-purity Al and high-purity N2 enter the vacuum chamber through the ion sources, wherein the Ar serves as the ionizing gas, and an effective glow discharging process is guaranteed; and the N2 serves as the reaction gas and is ionized to be combined with Cr and Al elements, and the CrAlN coating is formed on the surface of the high-temperature alloy cutting tool in a deposition mode. According to the prepared CrAlN coating, the anti-oxidization temperature of the coating is 1000 DEG C, the microhardness is Hv3500, and requirements of the high-temperature alloy cutting tool for the abrasion resistance, the thermal fatigue resistance and the anti-oxidization performance can be well met.

Description

technical field [0001] The invention belongs to the technical field of tool coatings, and in particular relates to a new method for preparing high-temperature alloy cutting tool coatings by ion source enhanced arc ion plating. Background technique [0002] In recent years, a large number of new ultra-high-strength and high-temperature-resistant alloys have been used in the main structural parts of advanced aero-engines such as blades, disc shafts, and casings, which increases the difficulty of tool cutting and puts forward higher requirements for cutting technology. Taking turbine casing parts as an example, difficult-to-machine materials such as iron-based, nickel-based and cobalt-based superalloys are widely used. These difficult-to-machine materials have small thermal conductivity, high specific strength, high cutting temperature, and are prone to work hardening, especially the high hardness, high strength and good plasticity of nickel-based superalloys, resulting in poor...

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Problems solved by technology

[0008] At present, the method of arc ion plating is mainly used for the preparation of tool coatings. The advantages of this method are high target ionization rate, fast deposition rate, and good bonding performance. However, the metal droplets sputtered from the target during the arc discharge process are relatively large. The coating structure is relatively loose and the surface roughness is poor, which will affect the cutting performance and service life of the coated tool

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