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

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.

In situ synthesis mechanism of ZrC‐ZrB2/Cu composites prepared by SHS‐casting method

“…Therefore, B 4 C combined with Zr atoms to synthesize stable ZrC and ZrB 2 . Maheswaraiah et al produced ZrB 2 ‐ZrC/Zr‐Si composites by reactive processing. They argued that the presence of Zr‐Si liquid accelerated the formation of ZrC and ZrB 2 .…”

Kinetic role of C/Zr ratio in the reaction process, combustion behavior, and synthetic product of 70 wt.% (xC–Zr)–30 wt.% Cu

“…Among various preparation methods, the combustion synthesis technology has attracted much attention for its easy operation and low energy consumption 14–16 . In addition, the combustion synthesis has been widely used to combine with other routes to prepare composites containing ZrC 17–30 . As these ceramic particles are mainly derived from the combustion synthesis reaction, understanding the kinetic characteristics is vital to achieving a desired microstructure.…”

“…[14][15][16] In addition, the combustion synthesis has been widely used to combine with other routes to prepare composites containing ZrC. [17][18][19][20][21][22][23][24][25][26][27][28][29][30] As these ceramic particles are mainly derived from the combustion synthesis reaction, understanding the kinetic characteristics is vital to achieving a desired microstructure. Conventionally, the influence of the kinetic parameters on the combustion behaviors and synthesized products was predicted by thermodynamic calculations and/or reaction mechanism.…”