A kind of nicraly high temperature sintering zta particle reinforced steel matrix composite material and preparation method thereof

Abstract

The invention discloses a NiCrAlY high-temperature sintered ZTA particle-reinforced iron-based composite material and a preparation method thereof. The surface of the ZTA particle is micro-roughened, and the thermal stability of the ceramic coating is improved by adding an active element Y, and Cr and Al are resistant to O elements. The adsorption capacity can greatly improve the wettability of Ni and ceramic particles, so that the interface bonding is transformed from simple mechanical bonding to metallurgical bonding, with high bonding and impact strength, which meets the working conditions under high load conditions. Binder is finalized and dried to obtain a prefabricated body with a honeycomb structure, and then the honeycomb prefabricated body is heat-treated to improve its bonding strength; it is put into a sand box to cast molten metal, and after cooling, a ZTA reinforcement with high wear resistance is obtained Steel matrix composites. The wear-resistant composite material prepared by adopting the technology of the invention not only has high impact and wear resistance, but also ensures service safety under harsh working conditions.

Description

technical field [0001] The invention belongs to the technical field of preparation of wear-resistant materials, and in particular relates to a NiCrAlY high-temperature sintered ZTA particle-reinforced iron-based composite material and a preparation method thereof. Background technique [0002] Large-scale composite materials are necessary equipment for crushing materials such as minerals and building materials in mining, metallurgy, cement, electric power and other industries, and composite materials are the most consuming wear parts in these devices. Only in the cement and electric power industries, the annual consumption of large-scale composite materials in my country is as high as 800,000 tons, causing huge economic losses. At present, due to the poor performance stability, wear resistance and short service life of domestic large-scale composite materials, it has become a key factor restricting the crushing efficiency in mines, so most of the domestic large-scale composi...

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Problems solved by technology

At present, the research on WC particle-reinforced iron-based composite materials is relatively extensive, mainly because of the high hardness of WC particles, which can endow the composite material with excellent wear resistance, and its good wettability with high-temperature molten iron is helpful for the composite material. preparation, but the application of WC reinforced ceramics has the following fatal problems: firstly, the price of WC is expensive, and the linear expansion coefficient of WC (3.8×10 -6 K -1 ) and steel materials (9.2~16.9×10 -6 K -1 ) has a large difference, the interface between the particles and the iron matrix is ​​prone to cracks due to thermal stress during the preparation process and heat treatment of the composite material, and the thermal shock resistance of the composite material is poor

Due to the poor binding between ZTA particles and iron base, the high chromium cast iron prepared by casting infiltration method is simply mechanically combined with ZTA, and the bonding strength is low, which seriously affects the wear-resistant parts under harsh actual working conditions. Scale application

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