Method for achieving in-situ synthesis of aluminum oxide enhanced ferrum-based powder metallurgy alloy

Abstract

The invention discloses a method for achieving in-situ synthesis of an aluminum oxide enhanced ferrum-based powder metallurgy alloy. The method comprises the following steps that (1) ferrous powder isfirstly subjected to oxidation treatment, the oxidation temperature of oxidation treatment ranges from 100 DEG C to 300 DEG C, and the oxidation time ranges from 0.5 h to 1 h; (2) aluminum powder andzinc stearate are added into the ferrous powder subjected to oxidation treatment to be subjected to ball grinding, the adding content of the aluminum powder is 1%-10% of the total mass, and the content of the added zinc stearate is 1%-2% of the total mass; and (3) alloy powder is pressed and sintered, the sintering temperature ranges from 1,000 DEG C to 1,150 DEG C, the temperature increase speedis 10-20 DEG C / min, and heat insulation is carried out after sintering. In the method, particles of the second phase are generated in situ, the complex enhancer pretreatment procedure in a traditional manner of externally mounting an enhancer is avoided, and production efficiency can be greatly improved; and for a composite prepared through the method, the enhancer is nucleated and grows in a metal matrix, and therefore the surface of the enhancer is free of pollution, the intermiscibility of the matrix and the enhancer is good, the interface bonding strength is high, and the mechanical performance of products can be effectively improved.

Description

technical field [0001] The invention relates to a method for in-situ synthesis of alumina reinforced iron-based powder metallurgy alloy, which is used for preparing the iron-based powder metallurgy alloy. Background technique [0002] Second-phase particle reinforcement is a very common means of strengthening metals. The metal matrix composites reinforced by this method can have the advantages of both the matrix metal and the reinforcing phase, and exhibit properties such as high strength, low cost, high modulus, easy fabrication and high wear resistance, and have broad application prospects. The powder metallurgy method, because of its special process of preparing alloys by powder pressing and sintering, is conducive to the introduction of the second phase particles, so the metal prepared by the powder metallurgy method is especially suitable for the second phase strengthening, and the powder metallurgy method can maximize the Minimize the segregation of alloy components, ...

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Problems solved by technology

[0003] Al 2 o 3 It has high hardness, high wear resistance and good corrosion resistance, and is difficult to dissolve in the metal matrix at high temperature. It is an excellent reinforcing phase, and the dispersed distribution of Al 2 o 3 Particles are beneficial to improve the mechanical properties and creep resistance of iron-based powder metallurgy, and have good development prospects, but due to the enhancement of the traditionally used external reinforcement, it will lead to Al 2 o 3 Poor wettability and poor bonding with the iron matrix, thus limiting the development of this material

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