A rare earth modified particle reinforced steel-based surface space configuration composite material and its preparation method

Abstract

The invention discloses a reinforced steel-based surface-layer spatial-configuration composite containing rear earth and modified particles and a preparation method thereof, and belongs to the technical field of powder metallurgy and composite preparation. The composite is composed of a reinforced body and a base body; the reinforced body is mixed powder of rear earth powder, the reinforced particles and 45 steel metal powder, and the base body is mixed powder of rear earth powder and 45 steel metal powder, wherein the rear earth powder is yttrium powder or neodymium powder; the preparation method comprises the steps that ball-milling is conducted on the reinforced body powder and the base body powder; the base body powder is put into a lower die, and corresponding holes are formed by means of upper dies in different shapes and filled with the reinforced body powder; vibration and pre-bulking are conducted, then forming is conducted by means of SPS, and finally, the reinforced steel-based surface-layer spatial-configuration composite containing the rear earth and the modified particles is obtained through heating treatment. According to the composite and the preparation method thereof, the technology is simple, the cost is low, the evenness of distribution of the reinforced particles with the spatial configuration in the base body is good, the bonding strength is high, and thecomposite has good durability and capability of impact resistance, corrosion resistance and oxidation resistance.

Description

technical field [0001] The invention relates to a rare-earth modified particle-reinforced steel-based surface-layer space configuration composite material and a preparation method thereof, belonging to the fields of powder metallurgy and composite material preparation. Background technique [0002] The powder metallurgy process is not only a metallurgical method for producing metal materials, but also a processing method for manufacturing mechanical parts. As a special metallurgical process, it can produce special materials that are difficult to produce by ordinary smelting methods. As one of the rare cutting processes, it can manufacture various precision mechanical parts. [0003] The traditional powder metallurgy method can be used to prepare iron-based composite materials based on iron and steel mixed with hard ceramic particles such as carbides or oxides. The mismatch between them leads to poor fluidity, compressibility, formability, and sinterability of the mixed powd...

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Problems solved by technology

[0004] Chinese invention patent CN104209496A introduces a device and method for preparing particle-reinforced metal-based surface composites. This method is to place reinforced particles in a quartz tube in a self-made vacuum full-type casting infiltration device, and with the help of vacuum sealing technology, improve The filling ability of the molten metal is conducive to the penetration of the molten metal between the particles, so as to obtain a thicker composite layer; the disadvantage of this method is the gas generated by the combustion of the foam and the gas generated by the gasification of the binder in the composite layer It will make the defects of air holes easily appear in the composite material, and it is impossible to produce parts with complex structure and high density, and the reinforcement particles in the composite layer will inevitably produce uneven distribution, which will affect the service life of the composite material.

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