| Summary: | Bimetal is a combination of two dissimilar metals that form a metallurgical bond. The manufacture of bimetallic bushing by centrifugal casting using the solid-liquid method has not been widely developed. There is still not recommendation for rotational speed or optimum temperature used in the manufacture of bimetallic bushing. This main objective of this research was to determine the first frozen layer temperature of the aluminum-silicon alloy when bronze was poured in centrifugal casting to produce a well-integrated
bond interface. The materials used were aluminum-silicon alloy and bronze. The molten temperature of aluminum-silicon alloy used was 725°C, while bronze was set up at a temperature of 1100°C. Molten metal was pouring into the mold alternately. First, aluminum-silicon alloy was poured into the mold. Then, bronze was poured gradually to form a bushing aluminum alloy-bronze bimetallic. The temperature variations of the first frozen layer of aluminum-silicon alloy were 27ºC, 350ºC, 400ºC, and 450ºC when bronze poured.
The molten metal was poured with the filling speed of about 0.2 kg/s into a rotating sand mold. The rotational speed of the mold was 350 rpm. The result shows that the bond interface’s width increases as the first frozen layer aluminum-silicon alloy temperature increases. As a result, interface wear and hardness are increased compared to the base metal. Hence, centrifugal casting with the first
frozen layer aluminum-silicon alloy was 450ºC recommended for aluminum alloy-bronze bimetal bushing applications.
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