材料科学
放电等离子烧结
制作
表征(材料科学)
锭
陶瓷
热的
烧结
太阳能
热发射率
光电子学
复合材料
纳米技术
光学
热力学
梁(结构)
病理
物理
替代医学
生物
医学
合金
生态学
作者
Simone Barbarossa,Roberto Orrù,Giacomo Cao,Andrea Balbo,Federica Zanotto,Elisa Sani
标识
DOI:10.1016/j.jallcom.2022.167965
摘要
So far, the studies regarding the innovative High-Entropy Borides (HEBs), which belong to the more general class of Ultra-high temperature ceramics (UHTCs), have been entirely confined to their fabrication or characterization from the microstructural, mechanical and oxidation resistance viewpoints. In this work, the optical properties of two members of HEBs, i.e. (Hf0.2Zr0.2Ta0.2Mo0.2Ti0.2)B2 and (Hf0.2Nb0.2Ta0.2Mo0.2Ti0.2)B2, are evaluated for the first time to assess their possible utilization in the thermal solar energy field. The bulk samples (96.5 % and 97.4 % dense, respectively) are obtained as single-phase products by Spark Plasma Sintering (1950 °C/20 min/20 MPa) starting from powders previously synthesized by Self-propagating High-temperature Synthesis (SHS). The optical characterization, whose results are discussed by comparing HEBs to the individual borides, shows that they are characterized by intrinsic spectral selectivity and low thermal emittance, resulting therefore interesting for high-temperature solar absorbers applications.
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