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

被引:3
|
作者
Barbarossa, Simone [1 ]
Casu, Mariano [1 ]
Orru, Roberto [1 ]
Locci, Antonio M. [1 ]
Cao, Giacomo [1 ]
Garroni, Sebastiano [2 ]
Bellucci, Devis [3 ]
Cannillo, Valeria [3 ]
机构
[1] Univ Cagliari, Dipartimento Ingn Meccan Chim & Mat, Unita Ric Consorzio Interuniv Nazl Sci & Tecnol Ma, Via Marengo 2, I-09123 Cagliari, Italy
[2] Univ Sassari, Dipartimento Sci Chim Fis Matemat & Nat, I-07100 Sassari, Italy
[3] Univ Modena & Reggio Emilia, Dipartimento Ingn Enzo Ferrari, Via P Vivarelli 10, I-41125 Modena, Italy
关键词
Solid solution; Borides; Self -propagating high-temperature synthesis; Spark plasma sintering; Oxidation resistance; FRACTURE-TOUGHNESS TEST; REFRACTORY DIBORIDES; ZIRCONIUM DIBORIDE; THERMAL-PROPERTIES; FABRICATION; CERAMICS; CONSOLIDATION; TM;
D O I
10.1016/j.ceramint.2024.01.119
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
In this work, (Zr0.5Ta0.5) B-2 and (Zr0.5Hf0.5) B-2 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 degrees 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)B-2 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 m(1/2), respectively. On the other hand, (Zr0.5Hf0.5) B-2 shows higher oxidation resistance in flowing and stagnant air at elevated temperatures.
引用
收藏
页码:12158 / 12166
页数:9
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