A kind of multi-principal element alloy and its method for treating the surface of titanium alloy

Abstract

The invention discloses a multi-principal element alloy and a method for surface treatment of a titanium alloy. The multi-principal element alloy comprises, by mole, 18-30 parts of Zr, 18-30 parts of Ni, 18-30 parts of Si, 18-30 parts of Ta, 1-10 parts of Ti and 2-5 parts of CeO2. According to the method, a titanium alloy base material is cleaned and subjected to sand blasting roughening treatment, then plasma spraying equipment is used for spraying multi-principal element alloy powder on the surface of the titanium alloy base material, finally the plasma-sprayed surface is subjected to remelting treatment through a CO2 laser device, and a coating is obtained. The prepared multi-principal element alloy coating adopts characteristics of high-entropy effect, slow diffusion effect, nanophase reinforcement, super-high lattice deformation, cocktail effect and the like of the multi-principal element alloy, abrasion resistance and high temperature oxidation resistance of the titanium alloy can be remarkably improved, and titanium fire can be prevented.

Description

technical field [0001] The invention belongs to the technical field of material surface treatment and strengthening, and in particular relates to a multi-principal alloy and a method for treating the surface of a titanium alloy. Background technique [0002] Titanium and titanium alloys have the advantages of low specific gravity, high specific strength, high yield ratio, strong corrosion resistance and good mechanical properties under high temperature conditions, and are gradually being used in many fields. However, due to the high friction coefficient and large fluctuations of titanium alloys, poor wear resistance, low oxidation resistance after reaching a certain temperature, easy to be ignited, and the flame has a tendency to spread spontaneously, these problems make it more widely used. limit. Since most of these problems of titanium alloys are not caused by the overall properties of the material, but are mainly related to the surface properties, it is an ideal choice ...

AI Technical Summary

Problems solved by technology

Technologies such as micro-arc oxidation, plasma spraying, supersonic spraying, ion implantation, electron beam deposition, laser nitriding, and double-layer glow ionization can be applied to the surface modification of titanium alloys; however, although these technologies are improving the surface of titanium alloys Some effects have been achieved in terms of friction and wear, high temperature oxidation, flame retardancy, etc., but these surface technologies also have their own limitations, such as thin coating layer, poor impact resistance, or weak combination with the substrate, or Significantly reduce the fatigue performance of the matrix and other shortcomings, which cannot meet the current needs, so it is necessary to develop coating materials and preparation technologies with higher performance