Preparation technology of vanadium carbide reinforced nodular cast iron base composite material

Abstract

The invention discloses a preparation technology of vanadium carbide reinforced nodular cast iron base composite material, mainly comprising the following steps: weaving a vanadium wire mesh with vanadium wires; preparing mesh-type three-dimensional skeleton structure by tailoring, rolling by layers or overlying; manufacturing a casting mold according to casting technique; putting the vanadium wire mesh-type three-dimensional skeleton into a casting mold cavity in advance; smelting nodular cast iron to be poured into the casting mold cavity; cooling and cleaning to obtain a vanadium wire-nodular cast iron binary material prefabricated body; putting the vanadium wire-nodular cast iron binary material prefabricated body into a thermal treatment furnace; heating to the carbide forming temperature for preserving heat to obtain vanadium carbide reinforced nodular cast iron base composite material. The composite material prepared with the method fully performs high wear-resisting property of vanadium carbide hard phase as well as favourable ductility, convenient regulation and control and reliable technology of nodular cast iron, solves the problems of incomplete reaction of composite material, uneven wild phase particle distribution, weakened wild phase interface pollution and the like, and can be widely applied to the wear-resisting fields of mines, electric power, metallurgy, coal, building materials and the like.

Description

technical field [0001] The invention belongs to the technical field of metal-based composite materials, and in particular relates to a preparation process of vanadium carbide reinforced nodular cast iron-based composite materials. Background technique [0002] Ductile iron is a commonly used metal material widely used in metallurgy, mining, electric power, construction, machinery, coal, automobiles and other industries. Due to its high carbon content, after inoculation and spheroidization, the carbon forms in the form of spherical or worm The shape of graphite is distributed in the structure, so that the ductile iron has better strength and toughness. However, due to the lack of hard phases such as carbides in ductile iron, its macroscopic hardness is only about HRC35, so ductile iron cannot resist the cutting and wear effect of abrasives on the surface of parts under wear conditions, which makes it difficult to apply ductile iron to wear On the equipment parts, it greatly ...

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Problems solved by technology

However, due to the lack of hard phases such as carbides in ductile iron, its macroscopic hardness is only about HRC35, so ductile iron cannot resist the cutting and wear effect of abrasives on the surface of parts under wear conditions, which makes it difficult to apply ductile iron to wear equipment parts, greatly limiting its scope of use

[0003] In terms of improving the wear resistance of ductile iron in production, by adding alloying elements or heat treatment to obtain structures such as bainite and martensite, the wear resistance can only be slightly improved, and ductile iron cannot be widely used in the field of wear; in recent years A composite preparation process of ceramic particle reinforcement has emerged, such as placing vanadium carbide or vanadium nitride particles on the bottom of the mold, and then pouring ductile iron, but the preparation process is difficult to control stably, and the distribution of reinforcement particles is uneven, and it is still difficult to obtain reinforcements. Uniformly distributed overall wear-resistant ductile iron

There are also hard particles such as vanadium carbide solidified with a binder, put into the mold, and then pour the molten metal to make the hard particles and the molten metal penetrate and fuse with each other. However, due to the decomposition of the binder at high temperature, a large amount of gas is generated. Lead to the formation of many pores inside the composite layer, the effect is not ideal

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