Microstructural evolution and 1500 °C oxidation resistance of Mo(Al,Si)2 fabricated via an innovative two-step SHS-SPS technique

IF 7.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials & Design Pub Date : 2024-10-24 DOI:10.1016/j.matdes.2024.113397

Nana Zhu , Lu Zhu , Baojing Zhang , Peizhong Feng , Shiheng Li , Philipp V. Kiryukhantsev-Korneev , Evgeny A. Levashov , Xuanru Ren , Xiaohong Wang

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Abstract

An innovative two-step approach of self-propagating high-temperature synthesis (SHS) and spark plasma sintering (SPS) was developed to rapidly fabricate MoSi₂ and Mo(Al,Si)₂ ceramics for high-temperature anti-oxidation applications. The SHS process predominantly promoted the synthesis of high-purity and high-yield MoSi₂ and Mo(Si,Al)₂ phases in the alloyed powders. Subsequently, dense and crack-free MoSi₂ and Mo(Al,Si)₂ ceramics were produced using SPS. 1500 °C oxidation tests of the ceramics (100 h) revealed the formation of a protective SiO₂ oxide layer on the surface of MoSi₂ ceramics, while an Al-Si-O composite glassy oxide layer formed on Mo(Si,Al)₂ ceramics, which exhibited better thermal stability and lower oxygen permeability compared to the single SiO₂ oxide layer. However, an excessive Al content (>0.05 at.%) compromised the oxidation resistance due to the emergence of a Si-depleted Mo₅(Si,Al)₃ layer with inferior oxidation resistance, which was caused by the high-temperature diffusion of Si. Therefore, via this novel two-step SHS-SPS technique compact and crack-free Mo(Si,Al)₂ ceramics can be rapidly synthesized at high temperatures. When trace amount of Al was added (0.05 at.%), Mo(Si_0.95Al_0.05)₂ showed optimum high-temperature oxidation resistance.

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通过创新的两步 SHS-SPS 技术制造的 Mo(Al,Si)2 的微结构演化和 1500 °C 抗氧化性

研究人员开发了一种创新的自蔓延高温合成（SHS）和火花等离子烧结（SPS）两步法，用于快速制造高温抗氧化用 MoSi2 和 Mo（Al,Si）2 陶瓷。SHS 工艺主要促进了合金粉末中高纯度和高产率 MoSi2 和 Mo(Si,Al)2 相的合成。随后，使用 SPS 生产出了致密无裂纹的 MoSi2 和 Mo(Al,Si)2 陶瓷。陶瓷的 1500 °C 氧化试验（100 小时）表明，MoSi2 陶瓷表面形成了保护性的 SiO2 氧化层，而 Mo（Si,Al）2 陶瓷表面形成了 Al-Si-O 复合玻璃状氧化层，与单一的 SiO2 氧化层相比，这种氧化层具有更好的热稳定性和更低的氧气渗透性。然而，过高的 Al 含量（0.05%）会影响抗氧化性，因为硅的高温扩散会导致出现抗氧化性较差的贫硅 Mo5(Si,Al)3 层。因此，通过这种新型的两步 SHS-SPS 技术，可以在高温下快速合成致密无裂纹的 Mo(Si,Al)2 陶瓷。当添加微量 Al（0.05%）时，Mo(Si0.95Al0.05)2 表现出最佳的高温抗氧化性。

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来源期刊

Materials & Design Engineering-Mechanical Engineering

CiteScore

14.30

自引率

7.10%

发文量

1028

审稿时长

85 days

期刊介绍： Materials and Design is a multi-disciplinary journal that publishes original research reports, review articles, and express communications. The journal focuses on studying the structure and properties of inorganic and organic materials, advancements in synthesis, processing, characterization, and testing, the design of materials and engineering systems, and their applications in technology. It aims to bring together various aspects of materials science, engineering, physics, and chemistry. The journal explores themes ranging from materials to design and aims to reveal the connections between natural and artificial materials, as well as experiment and modeling. Manuscripts submitted to Materials and Design should contain elements of discovery and surprise, as they often contribute new insights into the architecture and function of matter.