The density of composite ceramics showed a decreasing trend because Zr 2 Al 4 C 5 (4.5 g/cm 2 ) [ 15 ] has a lower density than ZrB 2 (6.09 g/cm 2 ) [ 5 ].
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Effect of Zr<sub>2</sub>Al<sub>4</sub>C<sub>5</sub> Content on the Mechanical Properties and Oxidation Behavior of ZrB<sub>2</sub>-SiC-Zr<sub>2</sub>Al<sub>4</sub>C<sub>5</sub> Ceramics.
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The sentences
The fracture toughness showed a trend that first increased and then decreased, and was increased by about 30% compared with ZrB 2 -SiC ceramics.