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Reactive Processing of a ZrB2 / ZrC / Zr–Si Ceramic Composite with a Controlled Oxygen Potential



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 / ZrSi ceramic composite. The graphite enclosure was placed in a temperature gradient with the hot zone at >2133 K to react ZrSi with B4C and with the opposite end approximating 933–1000 K at the position of an aluminum melt. A ZrB2 / ZrC / ZrSi composite forms with the scanning-electron microscope (SEM), microstructures showing rectangular ZrB2 precipitates and hexagonally shaped ZrC precipitates embedded in a ZrSi matrix.