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Nuclear grade graphite is a kind of key material in the high temperature gas-cooled reactor pebble-bed module (HTR-PM), where nuclear grade graphite acts as the fuel element matrix material, structural material and neutron reflector. In the reactor, the service environment of nuclear grade graphite suffers high temperature and strong neutron radiation. Both neutron radiation and the oxidation by the oxidizing impurities in HTGR coolant can cause the structure to damage and the properties to deteriorate. Therefore, it is of great significance to study the evolution of defects in nuclear grade graphite for improving the reactor safety. The effects of ion irradiation and oxidation on the point defects in IG-110 graphite are studied in this work. The 190 keV He+ implantation treatments at room temperature with fluences of 1 × 1015, 5 × 1015, 1 × 1016 and 1 × 1017 cm–2 are performed to induce 0.029, 0.14, 0.29 and 2.9 displacements per atom respectively. Oxidation treatments are performed at 850 ℃ for 10, 15, 20 and 25 min. Different sequences of He+ ion irradiation and oxidation are performed, which include irradiation only (Irr.), oxidation only (Ox.), irradiation followed by oxidation (Irr.-Ox.), and oxidation followed by irradiation (Ox.-Irr.). Raman spectrum shows that with the increase of ion irradiation dose, the intensity ratio of D peak to G peak (ID/IG) first increases and then decreases, implying that the point defects in graphite are induced by ion irradiation and the point defects evolve as dose increases; the degree of graphitization increases after oxidation, implying that the point defects are recovered by the annealing effect at high temperature, and the point defects decrease after oxidation. This makes Ox.-Irr. samples have a lower point defect content than Irr. samples, and leads Irr.-Ox. samples to possess a higher point defect content than Ox. samples. The positron annihilation Doppler broadening tests reveal that there are only point defects after ion irradiation and oxidation have partially recovered point defects. The ion irradiation and oxidation have opposite effects on the evolution of point defect in graphite. The ion irradiation increases the average S-parameter and reduces the average W-parameter, while oxidation reduces the average S-parameter and increases the average W-parameter. The annealing effect at 850 ℃ cannot completely recover the point defects in Irr.-Ox. samples.
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Keywords:
- high temperature gas-cooled reactor pebble-bed module /
- nuclear grade graphite /
- ion irradiation /
- oxidation /
- point defect
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图 1 SRIM软件模拟不同注量的190 keV He+辐照后IG-110核级石墨中缺陷数量的深度分布
Figure 1. SRIM simulation of the depth profiling of defects in IG-110 nuclear grade graphite after different fluences of 190 keV He+ irradiation.
图 2 样品的XRD图谱 (a)仅辐照的样品; (b)仅氧化的样品
Figure 2. XRD patterns of the samples: (a) Irr. samples; (b) Ox. samples
图 3 样品的尺寸和形貌 (a)未处理样品尺寸; (b)未处理样品的SEM形貌; 氧化(c) 10, (d) 15, (e) 20, (f) 25 min的样品的SEM形貌
Figure 3. Size and morphology of the samples: (a) Size of untreated sample; SEM morphology of (b) untreated sample; SEM morphology and of Ox. samples that were oxidized for (c) 10, (d) 15, (e) 20, (f) 25 min.
图 5 ID/IG的变化 (a)仅辐照的样品、辐照后氧化的样品和氧化后辐照的样品; (b)仅氧化的样品的ID/IG
Figure 5. Evolution of ID/IG ratios of the samples: (a) Irr., Irr.-Ox., Ox.-Irr. samples; (b) Ox. samples.
图 4 样品的拉曼光谱 (a)仅辐照的样品; (b)仅氧化的样品
Figure 4. Raman spectra of the samples: (a) Irr. samples; (b) Ox. samples.
图 6 样品中不同深度的S参数和平均S参数随辐照剂量和氧化时间的变化 (a), (c)仅辐照的样品; (b), (d)仅氧化的样品
Figure 6. Profiles of S-parameter and trends of the evolution of S-parameter: (a), (c) Irr. samples; (b), (d) Ox. samples.
图 7 在250—1250 nm的深度范围内平均S参数和平均W参数之间的关系
Figure 7. Relationship of the average S- and W-parameter in 250−1250 nm of all samples.
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[1] Kelly B T 1982 Carbon 20 3
Google Scholar
[2] Zhou Z, Bouwman W G, Schut H, Pappas C 2014 Carbon 69 17
Google Scholar
[3] Marsden B J, Jones A N, Hall G, Treifi M, Mummery P 2016 Structural Materials for Generation IV Nuclear Reactors (1st Ed.) (Cambridge: Woodhead Publishing) pp495−532
[4] Heijna M C R, de Groot S D, Vreeling J A 2017 J. Nucl. Mater. 492 148
Google Scholar
[5] [6] Zhai P F, Liu J, Zeng J, Yao H J, Duan J L, Hou M D, Sun Y M, Ewing R C 2014 Chin. Phys. B 23 126105
Google Scholar
[7] Zeng J, Liu J, Zhang S X, Zhai P F, Yao H J, Duan J L, Guo H, Hou M D, Sun Y M 2015 Chin. Phys. B 24 086103
[8] 付晓刚, 李正操, 张政军 2010 原子能科学技术 44 686
Fu X G, Li Z C, Zhang Z J 2010 Atom. Energ. Sci. Tech. 44 686
[9] Burchell T D, Pappano P J, Strizak J P 2011 Carbon 49 3
Google Scholar
[10] Kelly B, Marsden B, Hall K, Martin D, Harper A, Blanchard A 2000 Irradiation Damage in Graphite due to Fast Neutrons in Fission and Fusion Systems (IAEA-Tecdoc-1154) pp45−114
[11] Tang Z, Hasegawa M, Shimamura T, Nagai T, Chiba T, Kawazoe Y 1999 Phys. Rev. Lett. 82 2532
Google Scholar
[12] 王鹏, 于溯源 2013 核动力工程 2013 46
Google Scholar
Wang P, Yu S Y 2013 Nucl. Power Eng. 2013 46
Google Scholar
[13] Chi S, Kim G 2008 J. Nucl. Mater. 381 9
Google Scholar
[14] Yan R, Dong Y, Zhou Y, Sun X M, Li Z C 2017 J. Nucl. Sci. Technol. 54 1168
Google Scholar
[15] 魏明辉, 孙喜明 2013 原子能科学技术 47 1620
Google Scholar
Wei M H, Sun X M 2013 Atom. Energ. Sci. Technol. 47 1620
Google Scholar
[16] Lee J J, Ghosh T K, Loyalka S K 2013 J. Nucl. Mater. 438 77
Google Scholar
[17] 王鹏, 于溯源 2012 原子能科学技术 46 84
Wang P, Yu S Y 2012 Atom. Energ. Sci. Technol. 46 84
[18] 郑艳华, 石磊 2010 原子能科学技术 44 253
Zheng Y H, Shi L 2010 Atom. Energ. Sci. Technol. 44 253
[19] 徐伟, 郑艳华, 石磊 2017 原子能科学技术 51 694
Google Scholar
Xu W, Zheng Y H, Shi L 2017 Atom. Energ. Sci. Technol. 51 694
Google Scholar
[20] Richards M B, Gillespie A G, Hanson D L 1993 In-pile Corrosion of Grade H-451 Graphite by Steam in Modern Developments in Energy, Combustion and Spectroscopy (1st Ed.) (Oxford: Pergamon Press) pp87−94
[21] Liu J, Dong L, Wang C, Liang T X, Lai W S 2015 Nucl. Instrum. Meth. B 352 160
Google Scholar
[22] Vavilin A I, Chernikov 1992 Atom. Energ. 73 618
Google Scholar
[23] Ziegler J F, Ziegler M D, Biersack J P 2010 Nucl. Instrum. Meth. B 268 1818
Google Scholar
[24] 王鹏 2013 博士学位论文 (北京: 清华大学) 第30−34页
Wang P 2013 Ph. D. Dissertation (Beijing: Tsinghua University) pp30−34 (in Chinese)
[25] Reich S, Thomsen C 2004 Phil. Trans. R. Soc. Lond. A 362 2271
Google Scholar
[26] Childres I, Jauregui L, Park W, Cao H, Chen Y P 2013 Raman Spectroscopy of Graphene and Related Materials in New Developments in Photon and Materials Research (1st Ed.) (New York: Nova Science Publishers) pp1−20
[27] Hu Z, Li Z C, Zhou Z, Shi C Q, Schut H, Pappas K 2014 J. Phys. Conf. Ser. 505 012014
Google Scholar
[28] Shi C Q, Schut H, Li Z C 2016 J. Phys. Conf. Ser. 674 012019
Google Scholar
[29] MacKenzie I K, Eady J A, Gingerich R R 1970 Phys. Lett. A 33 279
[30] Schut H 1990 Ph. D. Dissertation (Delft: Delft University of Technology) pp67−102
[31] Lucchese M M, Stavale F, Martins Ferreira E H, Vilani C, Moutinho M V O, Capaz R B, Achete C A, Jorio A 2010 Carbon 48 1592
Google Scholar
[32] 徐世江, 康飞宇 2010 核工程中的炭和石墨材料 (北京: 清华大学出版社) (第1版) 第140−143页
Xu S J, Kang F Y 2010 Carbon and Graphite Materials in Nuclear Engineering (1st Ed.) pp140−143 (in Chinese)
[33] Latham C D, Heggie M I, Alatalo M, Oberg S, Briddon P R 2013 J. Phys. Conden. Matter 25 135403
Google Scholar
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