Effects of Copper Powder Bearing Material Composition on Working Characteristics

Abstract

Effects have been established for phosphorus and lead on the working characteristics of tinned bronze with high-speed operation (up to 20000 rpm or up to 2 m/sec) at low pressures (up to 2.0 MPa). It has been found that Cu − Sn − Pb − CP powder bearing material, where CP is a copper-phosphorus alloy, under such conditions has a lower coefficient of friction than does tinned bronze and a much higher wear resistance, while sliding bearings based on it have high working life. A microheterogeneous structure is formed in this material: an α-solid solution of tin in copper, along the boundaries of which there is uniformly distributed a strengthening phase (network of copper phosphide Cu 3 P with inclusions of the phosphide eutectic Cu 3 P + Cu 3 Sn + (Cu − Sn), and there are lead inclusions at the grain boundaries intersections. This material has very good tribotechnical characteristics at high rotation speeds and low pressures and also low coefficient of friction, low wear, and consequently long working life of bearings made of it.

Effect of BN fraction on the mechanical and tribological properties of Cu alloy/BN self-lubricating sleeves

“…[1][2][3][4] Cu alloy-graphite composite materials are widely used in the manufacturing of frictional parts of sewing machine sleeves due to their excellent thermal conductivity and frictional performance. [5][6][7][8][9] Graphite is therefore an important component of self-lubricating materials. Although graphite composite materials have excellent frictional performance, they tend to produce black wear debris, which pollutes the cloth when used in the self-lubricating sleeves of sewing machinery.…”

Effect of nanosilica additive particles on both friction and wear performance of mild steel/CuSn/SnBi multimaterial system

“…Technical and economical advantages of the powder metallurgy have led [7] (i) to produce a wide range of new materials with unique properties from components that have different melting temperatures or show liquid immiscibility, (ii) to control the grain size by varying the reduction ratio of the initial components, and (iii) to develop composites by combining a high-strength components. This has resulted in a sintered method which is one of the most important technological methods in PM [8][9][10][11][12]. Since this method makes it possible to combine in one material the most valuable properties of the original substances, where individually, they do not exhibit the whole set of requirements, therefore enhancing the performance characteristics of antifriction materials.…”

Preparation of novel polytetrafluoroethylene/copper-matrix self-lubricating composite materials

“…Copper matrix material is one of the metal matrix self-lubricating composite materials that are widely used in preparing frictional parts of sewing machinery and food machinery. 1,2 Tin bronze with excellent tribological properties, oxidation resistance and corrosion resistance is commonly used in sliding bearing. However, the powder metallurgy tin bronze/copper-matrix self-lubricating composite material is similar, as for as its properties are concerned, to ordinary sintered materials, which have low strength and poor toughness: when temperature is higher than 300℃, its matrix strength and wear resistance decline correspondingly.…”