Diffusion-bonded SiC joints were fabricated using molybdenum or titanium thin foils as active inserts by hot-pressing at 1500 and 1700°C . It was found that defects in die bonded zone were effectively mitigated by reducing oxygen activity during hot-pressing. Robust Mo foil-bonded SiC appeared to normally fail at both the joint interface and SiC base in shear test by compression loading of double-notched specimens. Apparent shear strength of ~150 MPa was demonstrated by torsional test for both Mo foil-joined SiC with a layered structure of Mo_(4.8)Si_3C_(0.6) and M02C phases and Ti foil-jointed SiC with mixed structure of Ti_3SiC_2and TiC_x phases.Notice: This manuscript has been authored by UT-Battelle, LLC, under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes.
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