Anti-abrasion and anti-corrosion composite functional coating layer

Abstract

The invention belongs to the technical field of thermal-sprayed coating layers and relates to a composite functional coating layer capable of resisting abrasion and corrosion. The coating layer consists of the chemical components such as NiCrAlY alloy powder, metallurgical TiC powder and rare-earth oxide La2O3 powder, wherein the adding amount of the NiCrAlY alloy powder accounts for 49.5-80 percent of the weight of the powder of the whole coating layer; the adding amount of the metallurgical TiC powder accounts for 19.5-50 percent of the weight of the materials of the coating layer; the adding amount of the rare-earth oxide La2O3 powder accounts for 0.5-5 percent of the weight of the materials of the coating layer. Metallurgical combination is realized, so that the bonding strength of the coating layer is high, and organization is compact; therefore, compared with the common coating layer, the coating layer has the advantages that the abrasion resistance and the corrosion resistance are greatly improved. The coating layer disclosed by the invention is processed by a plasma composite spraying technology such as laser and atmosphere instead of an independent thermal spraying technology; in order to fulfill the aim of realizing coating layer metallurgical combination, due to the metallurgical combination, the coating layer combining strength can be improved, and the high compactness of the organization of the coating layer is realized; due to the high combining strength and the low porosity, the coating layer is long in service life and high in abrasion resistance and corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of thermal spraying coatings, and relates to a composite functional coating which is anti-wear and anti-corrosion. Background technique [0002] It is an important branch of surface engineering to prepare protective coatings on the surface of components by thermal spraying process to prolong the service life of components. [0003] The working environment of many industries and weapons and equipment is very harsh, and many key components are subject to the combined effects of wear, corrosion, and high temperature. For example, arresting hooks, slide rails and other components of carrier-based aircraft must not only bear the effect of abrasion, but also withstand the corrosion of marine salt spray. The maintenance and replacement cycle is short and the cost is high. The resulting component failure will not only cause Huge economic losses, and affect national security. Therefore, the preparation and developm...

AI Technical Summary

Problems solved by technology

Laser remelting can achieve the purpose of metallurgical bonding and dense coating, but because it needs to penetrate the entire coating, the energy required is very high, the coating material is easy to be burned, and the original excellent performance of the sprayed material is lost, and it is easy to produce Larger residual stress and more cracks and holes will eventually lead to the degradation of coating performance and easy peeling failure; in addition, since it needs to be remelted after spraying, it is equivalent to prolonging the preparation period of the coating. And remelting parameters are difficult to control

[0017] After spraying, the coating adopts hot isostatic pressing, hot sintering and other heat treatment processes to realize the metallurgical bonding of the coating, which greatly improves the compactness and bonding strength of the coating. However, the heating process has a significant impact on the coating composition, which can lead to Coating components are thermally decomposed, overheated and burned, etc., which affect the performance and service life of the coating

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