Oxidation-Stable (Ti0.95M0.05)3(Si0.95Al0.05)C2 (M = Nb, Ta) ceramics for High-Temperature solar absorbers

IF 6 2区工程技术 Q2 ENERGY & FUELS

Solar Energy Pub Date : 2025-10-08 DOI:10.1016/j.solener.2025.114052

Anqi Dai , Qikai Liu , Feiqiang Guan , Zhenggang Fang , Jian Yang , Chunhua Lu

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Abstract

High-temperature stability and spectral selectivity are essential for solar absorbers in concentrated solar power (CSP) systems operating under oxidative environments. In this work, novel (Ti_0.95M_0.05)₃(Si_0.95Al_0.05)C₂ (M = Nb, Ta) ceramics were synthesized and evaluated for high-temperature solar absorbers. Nb- and Ta-doped samples, (Ti_0.95Nb_0.05)₃(Si_0.95Al_0.05)C₂ (TNSC) and (Ti_0.95Ta_0.05)₃(Si_0.95Al_0.05)C₂ (TTSC), exhibited high solar absorptance and low infrared emissivity at room temperature, with corresponding spectral selectivity of 3.0 and 2.8, respectively. At 750 °C, the doped samples maintained lower emittance values compared with that of the undoped counterpart, indicating improved thermal efficiency. After heat treatment in air at 800 °C for 9 h, TNSC and TTSC showed superior oxidation resistance, forming thinner oxide scales of 1.10 μm and 1.35 μm, respectively, compared to 1.52 μm for the undoped sample. Notably, TNSC retained a spectral selectivity of 2.0 after oxidation, demonstrating stable optical performance. This study reveals the potential of (Ti_0.95M_0.05)₃(Si_0.95Al_0.05)C₂ (M = Nb, Ta) ceramics as durable, high-efficiency solar absorbers for long-term operation in CSP systems under high-temperature oxidative conditions.

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氧化稳定陶瓷（Ti0.95M0.05）3(Si0.95Al0.05)C2 （M = Nb, Ta）高温太阳能吸收体

在氧化环境下运行的聚光太阳能（CSP）系统中，太阳能吸收器的高温稳定性和光谱选择性是至关重要的。本文合成了新型（Ti0.95M0.05）3(Si0.95Al0.05)C2 （M = Nb, Ta）陶瓷，并对其作为高温太阳能吸收体进行了评价。Nb-和ta掺杂样品（Ti0.95Nb0.05）3(Si0.95Al0.05)C2 （TNSC）和（Ti0.95Ta0.05）3(Si0.95Al0.05)C2 （TTSC）在室温下具有较高的太阳吸收率和较低的红外发射率，相应的光谱选择性分别为3.0和2.8。在750°C时，与未掺杂的样品相比，掺杂样品保持较低的发射度值，表明热效率提高。在800℃空气中热处理9 h后，TNSC和TTSC表现出优异的抗氧化性能，形成的氧化层分别为1.10 μm和1.35 μm，而未掺杂样品的氧化层为1.52 μm。值得注意的是，TNSC在氧化后仍保持2.0的光谱选择性，表现出稳定的光学性能。该研究揭示了（Ti0.95M0.05）3(Si0.95Al0.05)C2 （M = Nb, Ta）陶瓷作为CSP系统在高温氧化条件下长期运行的耐用、高效太阳能吸收体的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Solar Energy 工程技术-能源与燃料

CiteScore

13.90

自引率

9.00%

发文量

审稿时长

47 days

期刊介绍： Solar Energy welcomes manuscripts presenting information not previously published in journals on any aspect of solar energy research, development, application, measurement or policy. The term "solar energy" in this context includes the indirect uses such as wind energy and biomass