Effects of neutron radiation on the thermal conductivity of highly oriented pyrolytic graphite

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS Diamond and Related Materials Pub Date : 2024-11-19 DOI:10.1016/j.diamond.2024.111803

M.A. Guazzelli , L.H. Avanzi , V.A.P. Aguiar , A.C. Vilas-Bôas , S.G. Alberton , S.H. Masunaga , E.F. Chinaglia , K. Araki , M. Nakamura , M.M. Toyama , F.F. Ferreira , M.T. Escote , R.B.B. Santos , N.H. Medina , J.R.B. Oliveira , F. Cappuzzello , M. Cavallaro , for the NUMEN collaboration

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Abstract

Highly Ordered Pyrolytic Graphite (HOPG) has been extensively researched due to its chemical and physical properties that make it suitable for applications in several technologies. Its high thermal conductivity makes HOPG an excellent heat sink, a crucial characteristic for manufacturing targets used in nuclear reactions, such as those proposed by the NUMEN project. However, when subjected to different radiation sources, this material undergoes changes in its crystalline structure, which alters its intended functionality. This study examined HOPG sheets before and after exposure to a 14 MeV neutron beam. Morphological and crystallographic analyses reveal that even minor disruptions in the high atomic ordering result in modifications to its thermal properties. The results of this study are essential to establish the survival time of the HOPG used as thermal interface material to improve heat dissipation of a nuclear target to be bombarded by an intense high-energy heavy-ion beam.

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中子辐射对高取向热解石墨热导率的影响

高有序热解石墨（HOPG）的化学和物理特性使其适用于多种技术应用，因此对其进行了广泛的研究。高导热性使 HOPG 成为一种出色的散热器，这对于制造核反应中使用的靶件（如 NUMEN 项目提出的靶件）来说是一个至关重要的特性。然而，当受到不同辐射源的影响时，这种材料的晶体结构会发生变化，从而改变其预期功能。本研究对 HOPG 片材在暴露于 14 MeV 中子束前后的情况进行了检测。形态学和晶体学分析表明，即使是对高原子有序性的轻微破坏，也会导致其热学特性的改变。这项研究的结果对于确定用作热界面材料的 HOPG 的存活时间至关重要，这种材料可用于改善即将受到高能重离子束轰击的核靶的散热。

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来源期刊

Diamond and Related Materials 工程技术-材料科学：综合

CiteScore

6.00

自引率

14.60%

发文量

702

审稿时长

2.1 months

期刊介绍： DRM is a leading international journal that publishes new fundamental and applied research on all forms of diamond, the integration of diamond with other advanced materials and development of technologies exploiting diamond. The synthesis, characterization and processing of single crystal diamond, polycrystalline films, nanodiamond powders and heterostructures with other advanced materials are encouraged topics for technical and review articles. In addition to diamond, the journal publishes manuscripts on the synthesis, characterization and application of other related materials including diamond-like carbons, carbon nanotubes, graphene, and boron and carbon nitrides. Articles are sought on the chemical functionalization of diamond and related materials as well as their use in electrochemistry, energy storage and conversion, chemical and biological sensing, imaging, thermal management, photonic and quantum applications, electron emission and electronic devices. The International Conference on Diamond and Carbon Materials has evolved into the largest and most well attended forum in the field of diamond, providing a forum to showcase the latest results in the science and technology of diamond and other carbon materials such as carbon nanotubes, graphene, and diamond-like carbon. Run annually in association with Diamond and Related Materials the conference provides junior and established researchers the opportunity to exchange the latest results ranging from fundamental physical and chemical concepts to applied research focusing on the next generation carbon-based devices.