In-situ grown graphene enhanced oxidation resistance of NiAl

IF 5.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2025-10-02 DOI:10.1016/j.matchar.2025.115610

Jiayi Peng, Zeqian Wu, Zihang Li, Zi Wang, Liming Tan, Yan Wang, Lan Huang, Feng Liu

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Abstract

Graphene was in-situ synthesized during hot-pressed sintering process by mixing NiAl with glucose, and the effect of graphene on high-temperature oxidation performance was investigated. During oxidation, the oxide scale on NiAl spalled after 50 h of exposure and led to the exposure of the underlying metal to further oxidation. In contrast, the oxidation kinetics of NiAl-Gr followed a parabolic law and stabilized after 75 h. The presence of graphene played a crucial role in these observations. Graphene facilitated the transformation of transient Al₂O₃ phases into stable α-Al₂O₃, which resulted in a uniform and continuous oxide scale. Moreover, graphene bridged the interface between the matrix and the oxide scale, thereby improving the adhesion of the oxide scale. Graphene also reduced the residual stress within the oxide scale by refining the α-Al₂O₃ grains. The stress reduction suppressed spallation and consequently improved the high-temperature oxidation resistance of NiAl.

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原位生长石墨烯增强NiAl的抗氧化性

以葡萄糖和NiAl为原料，采用热压烧结方法原位合成了石墨烯，并研究了石墨烯对其高温氧化性能的影响。在氧化过程中，暴露50小时后，NiAl上的氧化皮剥落，导致底层金属进一步氧化。相反，NiAl-Gr的氧化动力学遵循抛物线规律，并在75 h后趋于稳定。石墨烯的存在在这些观察中起着至关重要的作用。石墨烯促进了瞬态Al2O3相向稳定α-Al2O3相的转变，形成均匀连续的氧化层。此外，石墨烯桥接了基体与氧化皮之间的界面，从而提高了氧化皮的附着力。石墨烯还通过细化α-Al2O3晶粒来降低氧化层内的残余应力。应力降低抑制了NiAl的剥落，从而提高了NiAl的高温抗氧化性。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.