Fabrication and integrity test preparation of HIP-joined W and ferritic-martensitic steel mockups for fusion reactor development

Thick tungsten coating on ferritic–martensitic steel applied with a vacuum plasma spray coating method

“…Therefore, we also carried out the homogeneity tests of layer bonding to identify defects in joints, which may cause problems under high-heat load conditions [4]. As a non-destructive examination method, ultrasonic testing was performed using a three-axis digital ultrasonic C-scan system, which was installed in the Korea Atomic Energy Research Institute [18]. The system is comprised of an ultrasonic pulser/receiver (Panametrics 5800PR), a transducer (Panametrics V312-SU) with a center frequency of 10 MHz, a piezoelectric element with a 0.635 cm diameter, and a flat protective layer.…”

“…The system is comprised of an ultrasonic pulser/receiver (Panametrics 5800PR), a transducer (Panametrics V312-SU) with a center frequency of 10 MHz, a piezoelectric element with a 0.635 cm diameter, and a flat protective layer. Based on the acceptance criteria [18], we scanned two tungsten coating layers, obtained under the same coating conditions and with similar tungsten thicknesses of 3.65 mm and 3.7 mm. As described in Fig.…”

Preliminary analysis for thermal-fatigue test of HIP joined W and ferritic-martensitic steel mockup

“…1, according to the developed procedures for hot isostatic pressing (HIP) joining method and post HIP heat treatment (PHHT) conditions [13]: W tiles with dimensions of 45 mm (W) × 45 mm (L) × 2 mm (T) and FMS blocks with dimensions of 45 mm (W) × 45 mm (L) × 30 mm (T) were joined. A surface coating of Ti, 2 m in thickness, as an interlayer was formed on the W tiles by using physical vapor deposition (PVD) in an electron beam evaporator.…”

“…As a candidate of PFC for DEMO, W/FMS joining methods have been developed and a new Ti interlayer was applied differently from the previous work [12,13], in which, the W/FMS PFC development was introduced focusing on the fabrication. In this study, the test conditions are determined through a thermal-fatigue analysis because the high heat flux test should be performed over the thermal lifetime of the mockup under the proper test conditions to confirm the integrity of the developed joining technology.…”