Challenges in Microwave Processing of Bulk Metallic Materials and Recent Developments

Abstract

In the recent years, microwave energy has been exploited for processing of metallic materials through different heating based processes such as sintering, joining, cladding, casting and drilling. Metallic powders are primarily processed through microwave sintering; whereas, other processes are used to heat/melt/ablate desired portion of the bulk metallic materials. Microwave sintering is the most mature process in terms of the literature and its presence in the industry among these processes. The feasibilities of casting, joining and cladding processes are well documented, though they are yet to become popular in industrial applications as alternatives to the conventional processes. Microwave drilling of non-metals have been demonstrated; however, drilling of the bulk metals using microwave energy is in the investigation stage and needs exhaustive experimentation to get established as an advanced metal machining process. This letter provides an overview of microwave energy based techniques used for processing of bulk metallic materials. The challenges in processing these materials have been identified; processing strategies have been briefly discussed. Future research opportunities in microwave processing of the bulk metallic materials have been outlined.