Abstract
ZrB2-based ceramics with Si3N4 short fiber (ZSN) were prepared by wet-spinning extrusion and hot pressing. The toughness of ZSN was 5.6 MPa·m1/2, which was 20% higher than that of monolithic ceramic (4.7 MPa·m1/2). The ablation performance of ZSN was evaluated by air discharge plasma ablation platform with a heat flux of 8.04 MW/m2 for 120 s. The mass and linear ablation rates of ZSN were − 0.19 mg/s and − 0.25 µm/s, respectively. The specimens of ZSN remained intact while monolithic ceramics exhibited destructive fracture. The better ablation performance of ZSN is attributed to the addition of Si3N4 short fiber which increased the fracture toughness, reduced the elastic modulus, and improved the thermal conductivity at high temperature.
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