Self-lubricating wear-resistant material and preparation process thereof

Abstract

The invention discloses a preparation process of a self-lubricating wear-resistant material. The preparation process comprises the following steps: heating a raw material so that the raw material forms molten iron, wherein the raw material contains carbon atoms, the carbon atoms are in a supersaturated state, then the carbon atoms in the raw material are in a local aggregation state, and part of the carbon atoms are in a free state; cooling the heated molten iron, wherein the carbon atoms are still in a supersaturated state, and the carbon atoms in a free state are preferentially separated outto form graphite; further cooling the molten iron so as to precipitate primary cementite from the raw material from which graphite is removed; enabling at least part of the primary cementite to formcementite and austenite through eutectic transformation; and further cooling the molten iron to convert the austenite into martensite. According to the preparation process, graphite, cementite and martensite are separated out at a time, meanwhile, the graphite is obtained without annealing treatment, and then the wear resistance of the wear-resistant material is not affected.

Description

technical field [0001] The invention relates to a self-lubricating wear-resistant material and a preparation process thereof. Background technique [0002] At present, in the use of wear-resistant white cast iron, in order to improve its wear resistance, the content of alloying elements is increased to increase the content of carbon compounds and to stabilize the structure of the matrix. However, the life of the above-mentioned alloying elements under dry friction or boundary friction is not very good. ideal. In order to solve this technical problem and prolong the service life of wear-resistant white cast iron, it is common practice to include free self-lubricating materials (such as graphite) in the tissue. In order to achieve the above purpose, it can be achieved by powder metallurgy, but due to the inconsistency of the matrix of the product using powder metallurgy, etc., its wear resistance is seriously affected. It is also possible to directly realize the simultaneous...

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Problems solved by technology

In order to achieve the above purpose, it can be achieved by powder metallurgy, but due to the inconsistency of the matrix of the product using powder metallurgy, etc., it seriously affects its wear resistance

It is also possible to directly realize the simultaneous appearance of graphite and cementite by casting, but there will be great technical problems in this way

In addition, there is also a graphitization annealing treatment of the cast white cast iron to partially decompose the cementite into fine graphite, which can also achieve the above purpose, such as the patent with the publication number CN1667133A, but due to the infiltration The decomposition of carbon body will reduce the wear resistance of the product and affect the service life

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