A kind of preparation method of iron-based pre-alloyed powder

Abstract

The invention discloses a method for preparing iron-based prealloy powder. The method includes the steps that (1) iron-based bulk metal is prepared, the content of Fe is 30wt%-90wt%, the content of Cu is 10wt%-70wt%, and the melting point is no more than 1,800 DEG C; (2) smelting water atomization powder process treatment is conducted on the metal, so that the iron-based prealloy powder is obtained; (3) the treated powder is dried; (4) after drying of the atomization powder is completed, low-melting metal simple substance powder is added, the melting point is no more than 500 DEG C, and the content is no more than 15wt%; (5) the low-melting metal powder and the dried powder are evenly mixed; (6) reduction treatment is carried out on the mixed powder through a reduction furnace, hydrogen flow is controlled to be 20m<3> / h-30m<3> / h, and reduction time is no less than 2h; (7) large particles are sieved and removed to obtain the iron-based prealloy powder. The method is easy to implement and simple and convenient to operate, by the aid of a high-temperature diffusion and evaporation cohesion principle in the reduction process, the content of produced Zn is 2-15% that of the iron-based prealloy powder, and the iron-based prealloy powder has the advantages of being low in oxygen content, simple in preparation mode and good in cold pressing formability.

Description

technical field [0001] The invention relates to the field of diamond matrix materials, in particular to a method for preparing iron-based pre-alloyed powder, which is suitable for adding low-melting-point elements to iron-based pre-alloyed powder for diamond in the diamond tool industry. technical background [0002] Pre-alloyed powder is defined as: A metal powder consisting of two or more elements which have been completely fused by mechanical or other means. In the preparation process of iron-based pre-alloy powder, it is difficult to add low-melting point metals such as zinc and lead in the wet preparation process because they are easily oxidized and cannot be reduced after oxidation. The boiling point of the metal is low, the volatilization is serious during the smelting process, and it is also very easy to oxidize, so it cannot be added. The low melting point metal has segregation phenomenon in the production of diamond tools, and it is easy to lose during the sinterin...

AI Technical Summary

Problems solved by technology

[0004] 1) Poor cold press forming ability;

[0005] 2) It is difficult to add metals such as Zn and Pb. At present, it is mainly added as simple powder, which has uneven distribution and poor product stability;

[0006] 3) The sintering process is more complicated, and it is necessary to perform diffusion alloying at high temperature before entering the sintering stage, and the sintering temperature is not easy to control;

[0007] 4) Powder particle size needs to be strictly controlled;

[0008] 5) Large loss during sintering

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