Method for cladding copper alloy layer on surface of steel substrate by laser brazing

Abstract

The invention relates to a method for cladding a copper alloy layer on the surface of a steel substrate by laser brazing. A method of feeding powder by argon gas, cladding by laser brazing and vacuum heat treatment is used on a laser machine for cladding a copper alloy layer on the surface of the steel substrate by laser brazing; the laser machine is used for remelting and curing the surface of the steel substrate firstly; and laser beams irradiate in all directions according to the geometric locus of ring steel set by computer programs to enable copper alloy powder and borax powder to be melted and cured on the surface of the steel substrate to form the copper alloy layer. The thickness of the copper alloy layer is 0.5mm; the average microhardness of the copper alloy layer is 375HV0.2 which is 2 times of the average microhardness of the steel substrate; and compared with the steel substrate, the wear resistance of the copper alloy layer is improved by 52.8%, and the corrosion resistance of the copper alloy layer is improved by 45.3%. The method has advanced processes and reasonable parameters; the metallographic structure of the cured and melted layer is compact and firm and can not fall off easily; and the method can be used for cladding alloy layers on the surfaces of steel substrates of various molded surfaces by brazing and can be used for cladding alloy layers on various molded surfaces and special-shaped non-standard molded surfaces, thereby greatly improving the performance of the surfaces of the steel substrates.

Description

technical field [0001] The invention relates to a method for cladding a copper alloy layer by laser brazing on the surface of a steel base, and belongs to the technical field of metal surface enhancement and modification. Background technique [0002] Among non-ferrous metal alloys, copper alloys have good electrical and thermal conductivity, excellent friction reduction and wear resistance, high elastic limit and fatigue limit and good processing performance, and have good corrosion resistance to atmosphere and water. Therefore, copper alloys have been widely used in aerospace, electronics industry, instrument industry, shipbuilding industry and machinery manufacturing industry. [0003] Copper alloy has many advantages, but copper reserves are small and expensive, so it is a material that should be used sparingly. Only in special cases, such as special magnetic properties, corrosion resistance, processing properties, mechanical properties and other conditions are required....

AI Technical Summary

Problems solved by technology

[0003] Copper alloy has many advantages, but copper reserves are small and expensive, so it is a material that should be used sparingly. Only in special cases, such as special magnetic properties, corrosion resistance, processing properties, mechanical properties and other conditions are required. before considering using

[0004] Tin bronze is widely used in shipbuilding, chemical industry, machinery, instrumentation and other industries. It mainly manufactures wear-resistant parts such as bearings and bushings, as well as anti-corrosion and anti-magnetic parts. Most copper alloy parts are integrally formed, which is costly and wasteful. , so that the application of copper alloys is greatly restricted, therefore, composite materials that choose cheap steel materials as substrates and copper alloys as claddings emerged as the times require

[0005] At present, there are many methods for preparing copper alloy composite coatings on metal surfaces, such as surface sintering, surface spraying, surface electroplating, and surface mechanical treatment. Uniformity, low bonding strength, easy to fall off, some complex processes, high cost, are not ideal, and need further discussion and research

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