b'microcantilever testing of the HiPIMStwo different neutron irradiationFigure 3. Representative and cathodic arc coatings showed thatexperiments. Tubes of Chemicalmicroscopy images of the HiPIMS coatings were very hardVapor Deposition (CVD) SiC werecorrosion in pre-cracks. Scanning electron microscopy with nanoscale grains while cathodiccoated with two different HiPIMSshow the cross-section, arc coatings were surprisingly ductileand cathodic arc coating architecturessurface, and liftout. Chemical with large grains. Initial testing ofand sent to collaborators for themapping using scanning hybrid HiPIMS and cathodic arcIl Trovatore irradiation in BR2 attransmission electron microscopy highlights the coatings with microindentation foundSCKCEN. At ORNL, coupon samplesoxide thickness.that small cracks could be stoppedwith 11 different coating architectures by the softer cathodic arc chromium,were machined from the stock of and the interface between the HiPIMSwell characterized DCMS, HiPIMS and cathodic arc layers can serve as aand cathodic arc coupons along with weakened pathway for crack deflection. an ion-assisted magnetron sputtered To test the two different cracksample set supplied by the University mitigation pathways, samplesof Wisconsin. These will be irradiated have been fabricated this FY forin High Flux Isotope Reactor (HFIR) at 300C to target SiC swelling effects.2020|AFC ACCOMPLISHMENTS 65'