Manufacturing method of copper-coated iron composite powder

Abstract

The invention relates to a copper-coated composite powder preparation method, which his characterized in the following steps; adding rapidly reducing iron powder into blue vitriol solution containing stabilizer and with pH of 0.1-6.5 under the condition of stirring; stirring for 2-10 minutes to make copper cover on surface of iron particles and get copper-coated composite powder; settling the solution for 1-20 minutes and pouring the upper supernatant; washing the deposit repeatedly till it carrying on neutral; Reducing and screening it; and subjecting it to oxidation-resistant process. The invention can make copper cover on iron particles evenly, tightly and firmly, and increase the anti-oxidation susceptibility.

Description

Technical field [0001] The invention relates to a method for manufacturing metal powder, in particular to a method for manufacturing composite metal powder. Background technique [0002] Compared with traditional ball bearings, oil-impregnated bearings have the advantages of low cost, no cutting, no pollution, and easy production. With the gradual expansion of the application range of powder metallurgy, the use of metal powder as the main raw material of powder metallurgy products has become more and more widely used. In 1999, the total output of oil-bearing bearings in my country reached 2.5 billion tons. Therefore, metal powder, the raw material required for the production of oil-containing bearings, has also increased rapidly, and the variety of metal powder has gradually developed from mixed powder and alloy powder to composite powder. At present, oil-impregnated bearings of powder products in my country are generally made of bronze powder and copper-iron mixed powder. On the...

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. Due to the segregation of copper, the appearance and color of the products produced are uneven and easy to oxidize, and the starting current of the produced oil bearings is too large, resulting in excessive noise

[0007] 1. The scope of protection is too narrow to achieve the purpose of complete protection: It has been proved by practice that copper-clad iron composite powder can also be produced without adding a stabilizer - 2-mercaptobenzothiazole in the production method, and copper sulfate The pH value of the solution, the weight ratio of copper sulfate and reduced iron powder, etc. have a single range of values, and copper-clad iron composite powders with various copper contents can still be produced under many other values.

[0008] 2. The values ​​of zinc stearate and benzotriazole are 5% and 5‰ respectively. Since the price of zinc stearate is tens of thousands of dollars per ton, the price of benzotriazole is dozens of per ton Ten thousand yuan, therefore, it has the disadvantages of excessive consumption and high cost