Journal of Metals, Materials and Minerals

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Self-lubricating bearings are one of the oldest industrial applications of porous powder metallurgy parts, dating back to the mid-1920s. They remain the highest part produced by the P/M industry. The objective of this research was to study the effects of sintering time, sintering temperature and ratio of adding aluminium on sintered properties of Cu-10wt%Sn bearing that was produced from powder metallurgy processing. Various physical and mechanical properties such as density, percentage of porosity and hardness were tested to elucidate the effect of processing parameters. Phase identification and microstructure were analyzed by X-Ray Diffractometer and optical microscope, respectively. Sintering times in the experiment were 5, 30, 45, 60 and 90 minutes; sintering temperatures were 830°C and 900°C and ratios of adding aluminium were 0wt%Al (no adding), 5wt%Al and 10wt%Al. It was found that the larger the addition of aluminium, the greater was the reduction in density and hardness under all sintering conditions. However, additional heat treatment after sintering, by isothermal annealing at 750o C for 1 hour and quenching in water, increased the hardness of all specimens. The best processing condition to obtain a high hardness was sintering at 900o C for 30 to 60 minutes followed by isothermal annealing at 750o C and quenching in water.

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