Method of preparing high temperature wear resistant coating

Abstract

A technology for preparing antiwear refractory coated layer features that the atom beam deposition is used to prepare coated layer, the electronic (or laser) beam treatment is used to control the microstructure of coated layer, and the iron beam technique is used to improve the adhesion between coated layer and substrate, and different coated layers.

Description

1. Technical field [0001] The invention belongs to a method for improving the high-temperature wear resistance of the surface of metal materials, and is mainly used for the preparation of alloy steel, such as high-temperature heat-strength steel, hot-working die steel, nickel-based alloy and cobalt-based alloy substrate surface coating. 2. Background technology [0002] Generally, the service temperature of high-temperature alloy steel is usually below 800°C. In order to use it at a higher temperature and in a harsher service environment, surface treatment must be carried out to improve the high-temperature resistance of the material. Existing coating preparation methods for improving the high-temperature wear resistance of the surface of metal materials include: [0003] 1. The surface chemical plating, electroplating and other traditional processes, as well as the later development of brush plating, chemical plating, etc., although the combination of the coating and the su...

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Problems solved by technology

[0003] 1. The surface chemical plating, electroplating and other traditional processes, as well as the later development of brush plating, chemical plating, etc., although the combination of the coating and the substrate has been greatly improved, the wear under extrusion is still insufficient

In addition, the coating contains many harmful impurities, which are prone to oxidation and corrosion under high temperature conditions, resulting in the peeling and damage of the coating.

It is not easy to prepare ceramic coating

[0004] 2. The high-temperature wear-resistant material is welded to the surface of the substrate by surfacing welding. This method can form a thicker coating, but it cannot be surfacing welding ceramic coating

In recent years, the quality of the coating has been greatly improved by the use of low-pressure plasma spraying, but the coating under high-temperature extrusion conditions still has the following shortcomings: the sprayed coating has low density, and the defects in the coating include voids, cracks, etc. More, oxide inclusions are formed in the coating due to oxygen intrusion during the spraying process, which is prone to spot erosion during use

[0008] In summary, some of the existing technologies above have poor bonding between the coating and the substrate, especially under high-temperature extrusion wear conditions; some cannot prepare ceramic coatings; some can improve the quality of homogeneous materials. Combination, such as the combination of alloy coating and alloy substrate, but can not improve the combination of heterogeneous materials, such as the combination of ceramic coating and alloy coating or substrate; some formed coating thickness is limited, the processing cost is very high

And the above existing technologies are generally used alone

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