Cu-Sn-Zn-Pb alloy coated composite iron powder and its production process

Abstract

The Cu-Sn-Zn-Pb alloy clad iron composite powder is formed through forming cladding Cu-Sn-Zn-Pb alloy layer on Cu clad Fe composite powder, and contains Cu 4.5-45 wt%, Sn 0.1-9 wt%, Zn 1-27 wt%, Pb 0.1-9 wt% and Fe for the rest. The Cu-Sn-Zn-Pb alloy clad iron composite powder is produced through mixing Cu clad Fe composite powder and Cu-Sn-Zn-Pb alloy powder or Sn powder, Zn powder and Pb powder, reducing adhesion or reducing diffusion in a reducing furnace at temperature of 450-800 deg.c for over 30 min to form cladding Cu-Sn-Zn-Pb alloy layer on Cu clad Fe composite powder, crushing, sieving, mixing and other steps. The present invention has the advantages of low cost, simple technological process, no environmental pollution, high antioxidant performance, etc.

Description

(1) Technical field [0001] The invention relates to a metal powder and a manufacturing method thereof, in particular to a composite metal powder and a manufacturing method thereof. (two), background technology [0002] At present, the metal powders used in oil bearings, diamond cutter heads, friction materials, etc. are mainly copper powder, copper tin zinc lead or iron powder, and a mixture of two or all of the first three powders is also used. Metal powders, these metal powders have following deficiencies: [0003] 1. Copper powder and iron powder are elemental metal powders, which are easily oxidized during use. [0004] 2. The mixed metal powder composed of copper powder, copper-tin-zinc-lead alloy powder and iron powder has different bulk density, and segregation is easy to occur when mixing, and the result of segregation will seriously affect the quality of the product. [0005] 3. The cost of raw materials for copper powder and copper-tin-zinc-lead alloy powder is v...

AI Technical Summary

Problems solved by technology

[0003] 1. Copper powder and iron powder are elemental metal powders, which are easily oxidized during use

[0004] 2. The mixed metal powder composed of copper powder, copper-tin-zinc-lead alloy powder and iron powder has different bulk density, and segregation is easy to occur when mixing, and the result of segregation will seriously affect the quality of the product

[0005] 3. The cost of raw materials for copper powder and copper-tin-zinc-lead alloy powder is very high, and its price is generally around 75,000 yuan per ton

[0006] Due to the above reasons, the price of products produced by using these metal powders is very high, and it is very easy to be oxidized. The quality of the oxidized products is very poor, easy to be damaged, and the service life is short

[0007] In order to solve the above problems, relevant technical personnel have developed copper-clad iron composite powder, which has the advantage of low cost, but has poor oxidation resistance of the powder itself. In the process of producing the product, the anti-oxidation performance of the powder is destroyed, so that the product is still easy to be oxidized