Preparation technique for alloy powder core tube thread in situ generating abrasion-proof composite material

Abstract

The invention discloses a preparing technique for abrasion-proof composite material in situ generation by using alloy powder core tube wires. Since the invented method perform complex by using a cast method, alloy powder dissolves and disperses caused by the hyperthermia action of the base metal liquid during complex process, and then metallurgically combines with the base metal liquid. At the same time, since the heat absorption effect of the alloy powder, local temperature is lowered, crystallization process is shortened, further diffusion of the alloy elements is prevented, thereby the alloy elements congregate in situ, crystal grains are remarkably refined, large amount of dispersed hard chemical compounds with high hardness are precipitated and solidified to form a high alloy wearing coat, and a good alloy transition coherence with the base metal is formed, the coherence boundary surface is firm, both wearing resistance property and tenacity are provided, and the integral property is improved greatly.

Description

technical field [0001] The invention relates to a preparation process for forming a wear-resistant composite material from an alloy powder core pipe wire, in particular to a preparation process for forming a wear-resistant composite material in situ on a metal matrix by an alloy powder core pipe wire. Background technique [0002] In modern industrial production, many important mechanical equipment and their parts are under harsh working conditions such as high speed, high temperature, high pressure, and heavy load. The requirements for material performance are constantly improving, and the performance of a single material is difficult to meet the requirements for use. . Using surface engineering technology to form a layer of composite material with excellent performance on the surface of the metal material and firmly bonded with the matrix, it not only maintains the characteristics of toughness and plasticity of the metal material, but also exerts the characteristics of goo...

AI Technical Summary

Problems solved by technology

Powder metallurgy is through powder compaction or injection molding, and then sintered at a certain temperature, through the diffusion of material atoms, the consolidation between particles is realized, the sintering time is long, and the energy consumption is high; hot extrusion is made by applying external pressure. Liquid metal infiltrates into the gap of the prefabricated part of the reinforcing material to solidify and form. It is mainly used for compounding non-ferrous metal materials with low melting point such as aluminum and magnesium. It is difficult to apply to high melting point steel and metal materials; melt infiltration is to impregnate metal liquid into porous powder. In the prefabricated block, this method has a wettability problem between the molten metal and the powder. At the same time, the prefabricated block is mostly made of binder, which generates gas at high temperature and easily forms pores; the stirring casting method is to directly add ceramic powder to the base metal. In the liquid, and stirred in a certain way, and then cast into shape, due to the small particles, it is difficult to enter and evenly disperse into the metal liquid; the thermal spraying process has narrow selection of materials, too thin wear-resistant layer, and low interface bonding strength and other defects; in-situ self-generation is a method for the reinforcement to grow and grow inside the matrix metal. The compatibility between the matrix and the reinforcement is good, the interface is clean, the combination is firm, and it has excellent mechanical properties, but optional The material system is limited, and the volume fraction of eutectic reinforcement materials cannot be adjusted

The excellent comprehensive performance of metal-based wear-resistant composite materials has shown great application potential in many fields, but due to factors such as high manufacturing costs and complex processes, the scope of application is still very limited.

Some people use alloy powder core tube wire for surfacing welding and welding a layer of wear-resistant layer on the surface of the metal substrate, but special surfacing welding equipment must be equipped, the operation time is long and the efficiency is low, and the two cannot form a good metallurgical bond. The wear-resistant layer is easy to peel off and crack, and the scope of application is also limited

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