Metal surface gradient coating cladding method

Abstract

The invention discloses a metal surface gradient coating cladding method, and belongs to the technical field of metal surface heat treatment. The metal surface gradient coating cladding method comprises four steps of matrix surface pretreatment, coating material setting, coating cladding treatment and coating inspection; and in the coating cladding process, through specific setting of coating cladding equipment, a laminar flow plasma generator and a cladding spraying gun are adopted to provide a heat source to laminar flow plasma to perform gradient treatment for a metal surface. After at least two times of classing treatment, a coating layer with a gradient is formed, so that the cracking or stripping damage in an ultrahard coating layer is prevented, and the application range of the coating layer is wider; the laminar flow plasma is fast in heating speed, and the matrix temperature is convenient to control, and is not higher to prevent generation of annealing deformation; and meanwhile, as the laminar flow plasma continuously works to cause relatively slow cooling of a machine body, and a formed transition area is higher, the stress release is better for hard surface material cladding.

Description

technical field [0001] The invention relates to a metal surface coating cladding method, in particular to a metal surface gradient coating cladding method, which belongs to the technical field of metal surface heat treatment. Background technique [0002] With the continuous development of economy and the continuous progress of human society, metal materials are widely used in people's daily life, which makes metal materials play an indispensable role in people's daily life. [0003] Many important surface properties such as hardness, wear resistance, corrosion resistance, oxidation resistance, and heat resistance depend on the physical and chemical properties of the surface of metal materials, and people usually use surface technology to improve the surface properties of metal materials, such as: The surface is wear-resistant, corrosion-resistant, heat-resistant, etc. Traditional surface treatment techniques, such as various spray coatings, solution coatings, coatings, etc...

AI Technical Summary

Problems solved by technology

Because the traditional turbulent arc plasma jet is short (a few centimeters), it does not grow into a beam, and the processing is rough, so it cannot be regarded as an ideal high-temperature beam-shaped heat source; laser beams are currently used in industrial fields such as welding, cutting, and surface treatment. application, the processing quality is good, but the equipment cost is high, the thermal efficiency is low (below 20%), and the single power is small (below 10kw), so it can only weld and cut thin plates, and the surface heat treatment depth is below 0.3mm; electron beam is also a kind of It is a good high-temperature heat source, and the power can be increased, but it needs to work under vacuum conditions. The equipment and process costs are very expensive, and it is not suitable for general processing; the unit cost of laminar arc plasma beam equipment is low, and the thermal efficiency is high (transferred arc 90 ﹪ or above, non-transfer arc 65% or above), the power of a single unit can reach more than 1000kw, and it can work stably under atmospheric pressure. It is very suitable for metal surface coating cladding treatment. The surface treatment depth can reach 3mm. The range, environmental adaptability and processing depth far exceed laser; in addition, the advantages of high power and atmospheric pressure environment can be used in nanomaterial production, new material synthesis, smelting, coal chemical industry, waste power generation, military industry, aerospace and other fields that require high power application