Copper infiltration agent for powder metallurgy

Abstract

The invention provides a copper infiltration agent for powder metallurgy. The copper infiltration agent comprises, by weight, 93.6 to 94.4 parts of copper, 2.1 to 3.5 parts of iron, 1.4 to 2.7 parts of carbon, 0.7 to 1.8 parts of manganese, 0.4 to 1.5 parts of chromium, 0.2 to 0.9 part of silicon, 0.3 to 1.2 parts of molybdenum, 0.1 to 0.8 part of phosphorus, 0.2 to 0.9 part of cobalt and 0.5 to 1.9 parts of bismuth. The copper infiltration agent for the powder metallurgy has the advantages of being good in forming property, high in infiltration efficiency, free of erosion, low in residual solvent and capable of obviously improving material density and mechanical property.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy materials, and in particular relates to a copper infiltrating agent for powder metallurgy. Background technique [0002] At present, due to its low cost and easy processing, powder metallurgy sintered steel parts are more and more widely used in industrial production, especially in the automotive machinery industry. Commonly used sintered steel gears, cams, valve seats, exhaust valve seats, etc. , when these parts are in service in some harsh environments, they are required to have good wear resistance and impact resistance, while maintaining high strength and hardness. However, the powder metallurgy sintered steel parts manufactured by the conventional pressing-sintering process cannot reach a completely dense state during the pressing process, and the residual pores as a defect affect its tensile strength, impact toughness, fatigue strength and hardness. And other properties, so that ...

AI Technical Summary

Problems solved by technology

However, since the copper infiltration of powder metallurgy is carried out in the temperature range of 1090-1150 °C, usually 1120 °C, and the solubility of iron in copper in this temperature range is about 3.8-4%, resulting in the direct use of Cu blocks and powder metallurgy parts Copper infiltration, copper infiltration efficiency is about 85%, corrosion cracks will be formed on the surface and inside of the parts, affecting the appearance and impact strength of the product, which leads to the appearance of large quantities (25-35%) of defective products

Usually machining is used to remove defective products, which increases the processing cost

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