Tungsten carbide particle reinforced steel matrix surface-layer composite material and preparation method thereof

Abstract

The invention discloses a tungsten carbide particle reinforced steel matrix surface-layer composite material and a preparation method thereof and belongs to the technical field of preparation of a wear-resistant material. The composite material is composed of three layers which are respectively a composite layer, a transition layer and a base material layer; the transition layer is positioned between the composite layer and the base material layer; the composite layer is mixed powder of tungsten carbide particles and 45 steel metal powder; the transition layer is mixed powder of tungsten powder and 45 steel metal powder; the base material layer is 45 steel metal powder; the preparation method of the tungsten carbide particle reinforced steel matrix surface-layer composite material comprises the following steps: firstly preparing powder, subsequently pressing a prefabricated blank and finally performing vacuum sintering to obtain the tungsten carbide particle reinforced steel matrix surface-layer composite material; according to the preparation method disclosed by the invention, the preparation temperature is relatively low; reinforcing particles are uniformly distributed in a base body commendably; the prepared tungsten carbide particle reinforced steel matrix surface-layer composite material is free of impurities, relatively high in performances, beneficial for environmental protection, capable of serving under complicated working conditions such as shock chilling, shock heating, impact and abrasion, and relatively good in impact resistance and oxidation resistance.

Description

technical field [0001] The invention relates to a tungsten carbide particle-reinforced steel-based surface layer composite material and a preparation method thereof, belonging to the field of composite material preparation. Background technique [0002] Among the workpieces used in mining, machinery, building materials and other fields, the workpiece is required not only to have good wear resistance to prolong the service life, but also to have good thermophysical properties to ensure the safety of the workpiece and to avoid the workpiece being chilled. Cracks will occur under complex working conditions such as heat, high speed, and high impact, making the material invalid. At present, in order to understand the operation of workpieces under special and complex working conditions, researchers have developed wear-resistant steel. Although the metal parts produced represented by wear-resistant steel have good thermophysical properties, which can solve the complex working cond...

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Problems solved by technology

[0003] 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 composite material prone to porosity defects, 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.

[0004] Chinese invention patent CN103667851A discloses a preparation method of particle-reinforced metal matrix composites. Firstly, the particles and matrix powder are mixed by ball milling, and then the mixed powder is sintered into a preform by spark plasma sintering (SPS). Finally, the preform is put into The advantage of the composite material prepared by this method is that the reinforcing particles can be evenly distributed inside the composite material. The disadvantage is that the wettability between the particles and the matrix is ​​poor, and the remelting temperature is not high. As a result, sufficient metallurgical reactions between the reinforcing particles and the matrix cannot occur, and the resulting interface width is low, which ultimately improves the mechanical properties of the composite material very little, and the cost performance of this process is also very low, which limits its industrial use.

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