Casting methods for the production of rotationally symmetric copper bimetals

Abstract

Multiple-material products are characterised by a complex property profile which is achieved by combining the particular advantages of at least two different materials. Bimetal casting is an energy- and material-efficient technology for the production of multi-metallic objects. This paper describes the development of a semi-continuous casting process for the formation of a rotationally symmetric bimetal with a cohesive bonding character at the interface of a copper–tin alloy (CuSn6) and pure copper (Cu99.5). Initial experiments are conducted by static casting to evaluate the thermal process window. Based on the results of the initial experiments, a vertical semi-continuous compound casting process is developed. A stable cohesive bond between the joining partners is accomplished by forming a solid solution at the interface. This paper is part of a Thematic Issue on Copper and its Alloys.

A Review on Casting and Testing of Bimetals

“…The manufacturing methods for production of Bimetals in the form of cylinders [6] [9] [10] [20] [21], blanks [8] [13], tubes/pipes/rods [15], [22]- [24], or strips [3], [25], etc with different combinations and shapes are listed in the above Table 2.1.…”

“…While study of the interface bonding has been the major area of research since both metals need to be joined to behave like a single metal. Analysis of images from SEM was one of the most common testing carried out on bimetal studies [5], [7], [13], [24] [17]. There are various process parameters that were used by different researchers in order to observe the variations in the microstructure and bonding of the bimetals at the interface.…”

A Novel Approach of Optimum Time Interval Estimation for Al-7.5Si/Al-18Si Liquid–Liquid Bimetal Casting in Sand and Metallic Moulds

“…By using different time intervals, a bimetallic material was successfully fabricated using a 10 s time interval. Extensive experiments on the thermal process window for Cu-Sn alloy/Cu by static liquid-liquid bimetal casting was conducted in [26]. It was reported in [26] that a cohesive bond between Cu-Sn alloy and pure Cu partners was achieved by forming a solid interface solution.…”

“…Extensive experiments on the thermal process window for Cu-Sn alloy/Cu by static liquid-liquid bimetal casting was conducted in [26]. It was reported in [26] that a cohesive bond between Cu-Sn alloy and pure Cu partners was achieved by forming a solid interface solution. Previous studies [27] have shown that liquid-liquid bimetal casting of carbon steel/chromium cast-iron bimetal can be used to fabricate a distinguishable composite interlayer.…”