Conception of a semi-conductor neutron detector with additive manufactured parts and field assisted sintering technology packaging

Overview & Synopsis

Semiconductors as silicon carbide are used for particle—here fast neutrons—detection because of their wide bandgap and efficiency with thermal and radiation resistance. The behavior of SiC diodes is better documented in harsh environments, but there is a lack of knowledge regarding their industrial integration. To reach a higher technology readiness level, the present work proposes for the detector conception an assembly made by Additive Manufacturing and sealed with Field Assisted Sintering Technologies. The design relies on a coaxial shape of insulating parts in alumina made by using the digital layer process and electrodes, core, and shell made of copper alloys using the layer powder bed fusion process. The overall shape of the parts is conical, which allows for self-centering, locking, and pressure of the electrode on the SiC diode. The electrodes are designed with an origami-type structure, which allows for controlled deformation and ensures electrical continuity. The housing is sealed using transient liquid phase bonding of borosilicate glass applied by screen printing. After sealing, detectors were investigated with x-ray tomography and electrical behavior. Finally, the detector was exposed to a fast neutron flux and successfully detected it.