Preparation process and device of nano-particle reinforced bimetal composite

Abstract

The invention relates to a preparation process and a device of a nano-particle reinforced bimetal composite, the nano-particle reinforced bimetal composite comprises the following chemical components by weight percent: 6-25% of Cr, 4-18% of Ni, 1.0-4% of Mo, 1.0-1.8% of Si, 1.2-3% of Mn, 0.4-2.2% of B, 0.1-1.2% of MgO, 0.2-2% of CaF2, 0.2-0.7% of C, 0.2-0.8% of Nb, not more than 0.9% of one or the combination of CeO2, Y3O2 and La2O3, 0.0-0.8% of Co, and the balance of Fe, and mixed particles of nano-sized carbides, nitrides, borides or carbonitrides are added in alloy powder. The vacuum induction melting and the cladding processes and equipment are adopted for melting and cladding the mixture on a workpiece, the thickness of a cladding layer is 0.1-25mm, the cladding layer contains 1%-50% of nano-reinforcing particles of one or the combination of the carbides, the nitrides, the borides and silicides, and the cladding layer has special performances of wear resistance, corrosion resistance, electrical conductivity, self-lubrication performance and the like. A coating layer and a base material form the metallurgical bonding, thereby having high bonding strength, overcoming the drawbacks in various coating processes at home and abroad, leading the coating layer to avoid the defects of shrinkage cavities, inclusion, cracking, shedding and the like and having the advantages of high heating temperature, fast speed, high production efficiency, small energy consumption, simple preparation process and low cost.

Description

technical field [0001] The invention belongs to the technical field of metal-based composite materials, and relates to a nanoparticle-reinforced bimetallic composite material and a preparation method thereof, in particular to a nanoparticle-reinforced bimetallic composite material preparation process and equipment. Background technique [0002] Wear and corrosion are the main forms of failure of many parts and equipment, involving various fields of people's lives such as industry, agriculture, and military industry. The economic losses they cause are staggering. According to incomplete statistics, the direct losses caused by wear and corrosion every year About 1% to 4% of the gross national product. The losses caused by friction and wear of various mechanical parts all over the world are as high as hundreds of billions of dollars every year. Most of the wear and corrosion are from the surface of the material or from the surface, such as corrosion, wear, oxidation and fatigu...

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Problems solved by technology

[0004] At present, although many preparation methods of metal surface composite materials have been developed at home and abroad, each method has its shortcomings that are difficult to overcome.

For example, the coating and the substrate in the spraying technology are still mechanically combined, and the sprayed layer falls off, which is not suitable for heavy-duty operating conditions; in the high-energy beam heat source cladding, the problem of pores and opening of the cladding layer has always been a difficult problem for carbide ceramic surfacing Cracks on the surfacing welding surface, low hardness on the spray welding surface, uneven thickness of the spray welding layer, low utilization rate of spray powder, low coating bonding strength, and low coating density; there are more evaporation of alloying elements and decarburization in vacuum cladding The phenomenon and equipment are complex; the high-frequency induction fusion coating has the disadvantages of serious oxidation of the workpiece, rough surface, burning of alloy elements and weak bonding between the coating and the substrate, etc., which directly affect the production efficiency and service life of the product. It restricts its promotion and application; while the high-energy melting-injection technology is still in the stage of experimental exploration and has not yet reached the level of widespread application

[0010] It can be seen from the above-mentioned published patents and reports that although many surface nano-coating technologies have been developed at home and abroad, because the coated material layer is relatively thin, generally only 0.1-1mm thick, and the surface coating The bonding strength between the coated material and the base material is poor, and there are various disadvantages such as complex process and poor working environment, so that the coatings prepared by these processes are limited to a certain extent in terms of popularization and application.

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