No abstract

A Zr–Si liquid reacted with B4C in a graphite enclosure was configured to control the oxygen potential (10−45 kPa) to form a ZrB2 / ZrC / Zr – Si ceramic composite. The graphite enclosure was placed in a temperature gradient with the hot zone at >2133 K to react Zr – Si with B4C and with the opposite end approximating 933–1000 K at the position of an aluminum melt. A ZrB2 / ZrC / Zr – Si composite forms with the scanning‐electron microscope (SEM), microstructures showing rectangular ZrB2 precipitates and hexagonally shaped ZrC precipitates embedded in a Zr – Si matrix.