In this work, (Zr0.5Ta0.5) B2 and (Zr0.5Hf0.5) B2 solid solutions are produced in dense form by coupling the Self-propagating High-temperature (SHS) and Spark Plasma Sintering (SPS) routes. A single boride phase solid solution is formed in both cases by SPS (1850 °C, 20 min) from the multiphasic ceramic powders preliminarily obtained by SHS. The use of small amounts of graphite during SPS is highly beneficial to eliminate oxide contaminants (from 14.5–16.0 wt% to 2.1–2.8 wt%), improve powder consolidation (from 87-90 % to 97.5–98 %), and make the operating conditions milder. Better mechanical properties are exhibited by the binary ceramics with respect to ZrB2 produced by SHS-SPS. The presence of Ta makes the performance of (Zr0.5Ta0.5)B2 superior compared to the Hf-containing system, with hardness, Young's modulus, and fracture toughness equal to 22.1 GPa, 636.9 GPa, and 2.46 MPa m1/2, respectively. On the other hand, (Zr0.5Hf0.5) B2 shows higher oxidation resistance in flowing and stagnant air at elevated temperatures.

Barbarossa S., Casu M., Orru R., Locci A.M., Cao G., Garroni S., et al. (2024). Synthesis, sintering, mechanical properties, and oxidation behavior of (Zr0.5Me0.5)B2 (Me = Ta, Hf) solid solutions. CERAMICS INTERNATIONAL, 50(7), 12158-12166 [10.1016/j.ceramint.2024.01.119].

Synthesis, sintering, mechanical properties, and oxidation behavior of (Zr0.5Me0.5)B2 (Me = Ta, Hf) solid solutions

Barbarossa S.
Primo
;
2024-01-01

Abstract

In this work, (Zr0.5Ta0.5) B2 and (Zr0.5Hf0.5) B2 solid solutions are produced in dense form by coupling the Self-propagating High-temperature (SHS) and Spark Plasma Sintering (SPS) routes. A single boride phase solid solution is formed in both cases by SPS (1850 °C, 20 min) from the multiphasic ceramic powders preliminarily obtained by SHS. The use of small amounts of graphite during SPS is highly beneficial to eliminate oxide contaminants (from 14.5–16.0 wt% to 2.1–2.8 wt%), improve powder consolidation (from 87-90 % to 97.5–98 %), and make the operating conditions milder. Better mechanical properties are exhibited by the binary ceramics with respect to ZrB2 produced by SHS-SPS. The presence of Ta makes the performance of (Zr0.5Ta0.5)B2 superior compared to the Hf-containing system, with hardness, Young's modulus, and fracture toughness equal to 22.1 GPa, 636.9 GPa, and 2.46 MPa m1/2, respectively. On the other hand, (Zr0.5Hf0.5) B2 shows higher oxidation resistance in flowing and stagnant air at elevated temperatures.
1-gen-2024
Settore FIS/01 - Fisica Sperimentale
Barbarossa S., Casu M., Orru R., Locci A.M., Cao G., Garroni S., et al. (2024). Synthesis, sintering, mechanical properties, and oxidation behavior of (Zr0.5Me0.5)B2 (Me = Ta, Hf) solid solutions. CERAMICS INTERNATIONAL, 50(7), 12158-12166 [10.1016/j.ceramint.2024.01.119].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/636671
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