High-toughness ferrous alloy coating for thermal spraying and preparation method thereof

Abstract

The invention relates to a high-toughness ferrous alloy coating for thermal spraying. The coating is prepared by thermally spraying powder made of a metal material, and the metal material comprises the following chemical components in percentage by weight: 5.3-6.8 percent of Cr, 0.37-0.55 percent of C, 0.8-1.4 percent of Si, 1.5-2.3 percent of Mn, 0.62-0.88 percent of Zn, 0.24-0.37 percent of Sb, 0.35-0.47 percent of Ti, 0.5-1.0 percent of Ni, 0.12-0.19 percent of Cd, 0.11-0.17 percent of Mo, 0.25-0.41 percent of lanthanides and the balance of Fe and inevitable impurities, wherein the sum of the weight percentage of Mn and Ni is 1.2-3.6; and the metal material contains at least one of Mo and Nb, and the total content of Mo and Nb is 3-7 percent; the microstructure of the coating is as follows: Cr7C3 strengthening phase is dispersed into austenite; the lanthanides comprise the following ingredients in percentage by weight: 20-24 percent of Ce, 10-13 percent of Sm, 3-6 percent of Gd, 12-15 percent of Pr, 7-11 percent of Nd and the balance of La, and the sum of the weight percentage of the ingredients is 100 percent. The ferrous compound spraying powder has better high temperature oxidation resistance and can avoid over oxidation in the spraying process, so that the compactness of internal combination of the coating is improved. Meanwhile, after spraying, the pore size in the coating is moderate, the pore shape is smooth, and the generation of cracks is effectively reduced, so that the oil storage function of a cylinder body can be well played.

Description

technical field [0001] The invention relates to a thermal spraying coating material and a preparation method thereof, in particular to a high-toughness iron-based alloy coating for thermal spraying and a preparation method thereof, belonging to the technical field of thermal spraying. Background technique [0002] Coatings applied by thermal spraying have long been known for many applications. For example, in vehicle engines, the surface of the oil-lubricated cylinder running-running surface has been coated for a considerable period of time, especially by plasma spraying, which significantly reduces the friction between the piston ring and the cylinder wall. The coefficient of friction, thereby significantly reducing the wear of piston rings and cylinders, makes the service life of the engine longer, the maintenance interval (such as oil change) is extended, and the performance of the engine is also significantly improved. [0003] Compared with other coatings, iron-based t...

AI Technical Summary

Problems solved by technology

However, like other coatings, in traditional macroscopic mechanical performance tests, iron-based coatings often undergo non-uniform deformation, and the plastic deformation is concentrated in a small number of shear bands, showing macroscopic brittleness.

This feature of iron-based coatings largely limits its application in the engineering field