Method for producing bronze coated iron powder

Abstract

The invention relates to a method for producing bronze coated iron powder, wherein copper accounts for 18%-20% (weight percentage) of the total weight of the composite powder, while tin accounts for 1.8%-2% (weight percentage) of the total weight of the composite powder, and the rest is iron. The method comprises the following steps of: according to the predetermined components of the bronze coated iron powder, weighing appropriate cupric oxide powder, tin powder and iron powder, respectively; firstly, evenly mixing the weighed cupric oxide powder and the pure iron powder together in a ball mill or a mixer, and then, adding the tin powder for mixing; next, moving the evenly mixed powder to a reducing furnace, and performing reducing diffusion in an ammonia decomposition or ammonia combustion atmosphere, thereby obtaining the bronze coated iron powder. The method for producing the bronze coated iron powder is simple in production process, thereby reducing the production cost; the copper layer on the surface of the individual bronze coated iron particle obtained by the method is complete and compact and the quality of the bronze coated iron powder is guaranteed; and simultaneously, no harmful substance is emitted in the preparation process, thereby avoiding pollution and damage on the environment.

Description

[0001] technical field [0002] The invention relates to a preparation method of copper alloy powder, in particular to a production method of bronze-clad iron composite powder. [0003] Background technique [0004] In the field of powder metallurgy, the amount of copper and copper alloy powder is second only to iron powder. It is mainly used in powder metallurgy parts, diamond tools, electrical alloys and other industries, and plays an important role in industrial production. Oil-impregnated bearings have the advantages of low cost and simplified structure. With the gradual expansion of the application scope of powder metallurgy, the use of oil-impregnated bearings, which is one of the main applications of powder metallurgy, is also becoming more and more extensive. Due to the high price of copper raw materials, the use of copper powder with higher copper content is severely restricted. Copper-clad iron composite powder is an ideal material for oil-impregnated bearings d...

AI Technical Summary

Problems solved by technology

Oil-impregnated bearings produced with copper-clad iron composite powder not only meet environmental protection requirements, but also have a much lower price, and have been widely used and promoted by users. However, there are still certain shortcomings in actual use: 1) Poor performance: copper-clad Bearings made of iron materials cannot meet the product requirements in high-speed applications, and can only be used in low-speed and low-load applications.

2) The sintering temperature is too high: the sintering temperature of copper-clad iron material is about 850°C. In actual production, a copper-based sintering furnace is used for sintering. The copper-based sintering temperature is about 750°C, which is too different from that of copper-clad iron. waste too high

[0007] 2) At present, copper-clad iron powder with good quality usually needs to be produced by chemical replacement method, which may cause pollution to the environment during the production process

[0008] 3) If the copper-clad iron powder is obtained by the reduction diffusion method as the raw material, the uniformity and density of the copper layer are not high enough, resulting in the subsequent reduction adhesion or reduction diffusion with copper-tin alloy powder or tin powder. The tin layer is not stable enough, it is easy to fall off during transportation or work