In-situ preparation method of surface self-lubricating hard alloy

Abstract

The invention discloses an in-situ preparation method of a surface self-lubricating hard alloy. The method comprises the following steps that TiC and TiN particles are deposited on an iron matrix by using a plasma spraying technique, and the surface of titanium droplets react with nitrogen and carbon atoms continuously in the spray deposition process; the sizes of TiC and TiN particles and the relative content of the TiC and TiN particles can be controlled by adjusting the distance between the iron matrix and an oil injector; at least one groove is formed in the outer side wall of the iron matrix; the metal powder is injected into a plasma injector after being heated and melted, reaction gas is introduced, and reinforced particles are formed and deposited on the iron matrix; and carbon isheated until the carbon is converted into crystalline carbon or graphite. The process has the characteristics of melting and rapid solidification, and can ensure a fine matrix structure and uniform distribution of the reinforced particles. The crystalline carbon or graphite is combined. As carbon has a layered crystal structure, the carbon has a self-lubricating characteristic, a low friction coefficient and good wear resistance, and the iron-based alloy has a self-lubricating property.

Description

technical field [0001] The invention belongs to the technical field of in-situ preparation of alloys, and in particular relates to an in-situ preparation method of surface self-lubricating hard alloy. Background technique [0002] Iron-based alloys are the most widely used type of hard surface materials. The biggest feature of this type of material is that they have good comprehensive properties, a wide range of performance, and the lowest price of materials. The most typical age-hardening iron-based alloy The alloy is maraging steel (18Ni type). The mass fraction of carbon is extremely low, no more than 0.03%. Add a large amount of Ni and cool to room temperature to obtain lath martensite. Because of the low mass fraction of carbon, the strength and hardness of martensite are not high, but the toughness is good. During aging treatment at 450-500°C, the alloying elements first segregate at the dislocations to form "air clusters", and then precipitate Ni2M and Ni3M (M repres...

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Problems solved by technology

[0003] The traditional in-situ preparation method of hard iron-based alloys has high cost of composite materials, uniform distribution of reinforcements, and interface reactions, and cannot use traditional metal melting and casting equipment, and does not have self-lubricating properties. Therefore, we propose A kind of in-situ preparation method of surface self-lubricating cemented carbide

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