Making process of composite iron-in-copper powder

Abstract

The making process of composite iron-in-copper powder includes adding reduced iron powder fast into copper sulfate solution with added stabilizer and pH value 0.5-4.8 under stirring to make copper coat the surface of iron particle to form composite iron-in-copper powder; depositing composite iron-in-copper powder for 3-20 min, eliminating supernatant, washing with clear water until showing no acidity; dewatering, drying and sieving; antioxidant treatment, mixing, inspection and storing. The said technological process can coat iron powder with copper homogeneously, closely and firmly, and the composite iron-in-copper powder has raised antioxidant performance and no oxidation within 6 months.

Description

(1) Technical field [0001] The invention relates to a method for manufacturing metal powder, in particular to a method for manufacturing composite metal powder required for producing oil-impregnated bearings. (2) Technical background [0002] Compared with traditional ball bearings, 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, one of the main applications of powder metallurgy, has become more and more widely used. In 1999, the total output of oil-impregnated bearings in my country reached 2.5 billion. Therefore, metal powder, the raw material required for the production of oil-impregnated bearings, has also increased rapidly, and the variety of metal powder has gradually developed from mixed powder, alloy powder to composite powder. At present, the oil-impregnated bearings of powder products in my country are generally made of ...

AI Technical Summary

Problems solved by technology

[0003] 1. Due to the difference in bulk density between copper powder and iron powder, segregation is easy to occur when mixing, and segregation causes more copper in some places, less copper in some places, or even no copper, and copper-coated places For iron powder particles, the copper film is too thick; where there is less copper, when copper coats iron powder particles, the coating is not complete, or even completely uncoated

In short, it is the copper-coated iron powder that is uneven

[0004] 2. Due to the physical contact between copper and iron, it is easy to wrap the gas in it, resulting in a decrease in the degree of contact tightness, resulting in bubbling and shedding of the copper film

[0005] 3. Since this method has not undergone anti-oxidation treatment, the copper-clad iron composite powder produced is easy to oxidize