CHARACTERISTIC OF INTERFACE BIMETAL ALUMINUM-COPPER FOR BIMETAL BUSHING PRODUCED BY CENTRIFUGAL CASTING

Benidiktus Tulung Prayoga,Lilik Dwi Setyana,Nugroho Santoso,Bambang Suharnadi

doi:10.36547/ams.27.1.756

Abstract

Bimetallic is a type of metal composite that combines two metals that form a metallurgical bond. The manufacture of bimetallic bushings by centrifugal casting has not been developed much. Recently, there is no recommendation yet for optimum temperature and speed of rotation to produce bimetallic bushings. The research was conducted to determine the rotation of the mold in centrifugal casting so as to produce a well-integrated interface. The materials used are aluminum and copper. Aluminum was melted at 750 °C, while copper was melted at 1200 °C. Molten metal was pouring alternately. First, aluminum was poured into the mold, and then after the aluminum temperature reached 400º C, copper was poured into the mold to form a bushing aluminum-copper bimetallic. The molten metal was poured into a rotating sand mold with a constant filling speed of about 0.15 kg s-1. The variations of the rotational speed of the mold were 250, 300, and 350 rpm. The result shows that the interface’s width increases as the mold rotation increases during the pouring process. Interface hardness and wear are increased compared to the base metal. Hence, centrifugal casting with 350 rpm is recommended for aluminum-copper bimetal bushing applications.

Highlights

The centrifugal casting principle applies forces generated from the centripetal acceleration of a rotating mold [1]
These characteristics are caused by the distribution of molten metal into the mold cavity, which uses forces resulted from the centripetal acceleration of a mold rotation
Aluminum-copper bimetallic bushing was produced by vertical centrifugal casting

Summary

Introduction

The centrifugal casting principle applies forces generated from the centripetal acceleration of a rotating mold [1]. Centrifugal casting produces a product with accurate dimensions and limited gas porosity [1,2] These characteristics are caused by the distribution of molten metal into the mold cavity, which uses forces resulted from the centripetal acceleration of a mold rotation. The manufacture of bimetallic composites by casting produces a cohesive compound and diffusion of the metal interface during pouring, resulting in a high bond strength [13]. The manufacture of bushing by centrifugal casting will create products with accurate dimensions, smooth surface, less gas porosities, and faster freezing [2]. Defects that form in the bimetallic are due to a delay when pouring molten copper after solidification of the aluminum This causes the formation of metallurgical bonds at the interface to improperly formed [9].

Methods

Results

Conclusion