Microstructure, mechanical properties and tribological behaviour of PM Fe-Cu-Zn alloys containing solid lubricants

Abstract

properties. One of the important requirements for materials used in bearing production is the coeYcient of friction.4 Fe-Cu-Zn alloys containing solid lubricants of Generally the coeYcient of friction is highly dependent on graphite and talc produced via cold pressing and the compositions used. sintering technology are investigated. The in uence Many of the early works were focused on the study and of composition and sintering temperature on open optimisation of bronze alloys because of the potentially large porosity, density, strength and hardness of these application and excellent antifriction properties exhibited by alloys is studied. The microstructure is correlated with PM bronze materials. The possibility of fabrication of antithe mechanical properties of the sintered materials. friction material containing 31•5 wt-%Cu, 3•5 wt-%Sn, Fe The tensile tests showed that the peak strength was was reported before.5 The main limitations were unsatisfactory observed for samples sintered at å 1000°C. Above this antifriction properties and the high cost of the material. temperature the bending and tensile strength values Another work examined the material containing 44•5 wt-%Cu, decrease. Microstructural analysis of sintered materials 4•5 wt-%Sn, 1•0 wt-% graphite and Bal. Fe.6 Unsatisfactory revealed three phases in the structure: a-Fe, a-brass distribution of components and low mechanical and and talc. Results indicate that the microstructure of antifriction properties were reported. sintered samples is sensitive to process variables such The present study examines the possibility of manuas brass and talc contents and sintering temperature. facturing of iron base Cu-Zn-talc alloys via cold pressing PM/1038 and sintering with a limited amount of added lubricant. The intent is to understand the microstructure development At the time the work was carried out Professor during sintering and the formation of consequent anti-A. T. Mamedov is in the Department of Casting friction and mechanical properties of sintered materials. and Welding Manufacture, Faculty of Metallurgy, Future development of these types of materials can provide

Experimental Analysis of Microstructure and Mechanical Properties of Copper and Brass Based Alloys

“…After the test, the yield strength, tensile strength, fracture strength and ductility were measured and fracture surfaces were examined using the inverted microscope. Increase in yield strength and decrease in tensile elongation can be achieved by decreasing the thickness of the specimen, as has been investigated on Cu, Al, Au and Ni foils with thickness less than 250 µm [16,17]. From the literature survey and experimental observation, it was found that the tensile properties of specimens depend on the annealing temperature as well as time, and by increasing any one of these, the tensile strength normally reduces and ductility increases.…”

Process Design, Development and Mechanical Analysis of Cu-Zn Alloy Produced by Sand Casting Process

“…Previous studies have also shown that the microstructure and mechanical properties of brass can also be enhanced with a carefully balanced composition of Cu-Zn and other alloying elements, addition of additives as well as the use of appropriate heat treatment technique [17][18]. Many innovative approaches aimed at improving the microstructure and mechanical properties of brass alloy have been reported [19][20][21]. For instance, Imai et al [22] reported that the strength of Cu-Zn alloy (brass alloy) can be improved via the addition of small amount of chromium in solid solution as the strength impact of Cr solid solution in Cu-Zn alloy was reportedly significant as opposed to brass alloy strengthening via Cr precipitation.…”

Effect of porosity, density and temperature on microstructure and mechanical behavior of hybrid premix sponge ferrous compact

“…Addition of 0.6 % Carbon yielded a tensile strength of 275-500 MPa and transverse rupture strength of 640-1260 MPa [10]. Addition of Brass 10 % with iron plays a major role in determining the mechanical properties and microstructure with an optimum sintering temperature less than or equal to 1000 °C [11]. Addition of Cu, C, and Sn with iron powder improves the mechanical and microstructure property.…”