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ZrB2-based composites are candidate materials for ultra-high temperature materials (UHTMs). ZrB2 has become an indispensable ingredient in UHTMs, due to its high melting temperature, relatively low density, and excellent resistance to thermal shock or oxidation. ZrB2 powders are usually synthesized by solid state reactions such as carbothermal, borothermal, or combined carbothermal reaction. SiC is added to this system in order to enhance the oxidation resistance of ZrB2. In this study, ZrB2–based composites were successfully synthesized and densified through two different processing paths. ZrB2 or ZrB2 −25 vol.%SiC was fully synthesized from oxide starting materials with reducing agents after heat treatment at 1400℃. Besides, ZrB2–20 vol.%SiC was fully densified with B4C as a sintering additive after hot pressing at 1900℃. The synthesis mechanism and the effect of sintering additives on densification of ZrB2 –SiC composites were also discussed.
ZrB2-based composites are candidate materials for ultra-high temperature materials (UHTMs). ZrB2 has become an indispensable ingredient in UHTMs, due to its high melting temperature, relatively low density, and excellent resistance to thermal shock or oxidation. ZrB2 powders are usually synthesized by solid state reactions such as carbothermal, borothermal, or combined carbothermal reaction. SiC is added to this system in order to enhance the oxidation resistance of ZrB2. In this study, ZrB2–based composites were successfully synthesized and densified through two different processing paths. ZrB2 or ZrB2 −25 vol.%SiC was fully synthesized from oxide starting materials with reducing agents after heat treatment at 1400℃. Besides, ZrB2–20 vol.%SiC was fully densified with B4C as a sintering additive after hot pressing at 1900℃. The synthesis mechanism and the effect of sintering additives on densification of ZrB2 –SiC composites were also discussed.
