Joining of dissimilar materials using electrical currents: a flash approach
Abstract
The state of the art of technology to join dissimilar materials (i.e. refractory metals and Ceramic Matrix Composites) is not mature and reliable, meaning that either there are no joining methods available or that the processes are not feasible without damaging the materials to be processed. The proposed research aims to pioneer the development of ultra-rapid (a few seconds) joining techniques and to contribute to basic understanding of electro/thermal/chemical/mechanical phenomena occurring on such short timescales. The development of Flash (ultra-rapid) technology would enable the development of next generation “hybrid” and “integrated” key components to be employed in various sectors including aerospace applications, energy production, wind energy, furnace technologies, security, and transportation. With the heating localized at the interface of the joints, the problem of thermal degradation is minimized. The proposed research work investigates how to develop a robust joining technique where high electrical power is precisely delivered at the interface of the joints.Accurate control of electric currents, voltage, waveform, duty cycle, pressure are employed to assure good quality of the joints with minimal undesired degradation of the bulk components to be processed (i.e. thermal affected zone and compositional changes). Highly controlled experiments, coupled with Finite Element Analysis, are proposed as an approach to tailor joining solutions for a wide range of materials and geometries. The work is expected to generate significant impact. The research should allow joining of dissimilar materials (metals to metals and ceramics to metals) to enable novel applications/products covering aerospace, nuclear (energy production) and defence sectors.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 09, 2018
- Source ID
- FA95501710526
Entities
People
- Michael Reece
Organizations
- Air Force Office of Scientific Research
- Queen Mary University of London
- United States Air Force