{"created":"2023-06-19T10:26:31.806928+00:00","id":5114,"links":{},"metadata":{"_buckets":{"deposit":"e4930db6-e49d-402b-b4f5-9ad84d411962"},"_deposit":{"created_by":18,"id":"5114","owners":[18],"pid":{"revision_id":0,"type":"depid","value":"5114"},"status":"published"},"_oai":{"id":"oai:muroran-it.repo.nii.ac.jp:00005114","sets":["41:227"]},"author_link":["22725"],"item_81_date_granted_17":{"attribute_name":"学位授与年月日","attribute_value_mlt":[{"subitem_dategranted":"2013-09-26"}]},"item_81_degree_grantor_10":{"attribute_name":"学位授与機関","attribute_value_mlt":[{"subitem_degreegrantor":[{"subitem_degreegrantor_language":"ja","subitem_degreegrantor_name":"室蘭工業大学"},{"subitem_degreegrantor_language":"en","subitem_degreegrantor_name":"Muroran Institute of Technology"}],"subitem_degreegrantor_identifier":[{"subitem_degreegrantor_identifier_name":"10103","subitem_degreegrantor_identifier_scheme":"kakenhi"}]}]},"item_81_degree_name_11":{"attribute_name":"学位名","attribute_value_mlt":[{"subitem_degreename":"博士（工学）","subitem_degreename_language":"ja"}]},"item_81_description_25":{"attribute_name":"フォーマット","attribute_value_mlt":[{"subitem_description":"application/pdf","subitem_description_type":"Other"}]},"item_81_description_7":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"本論文はダイバーター機器を目的としたタングステンとSiC/SiC複合材料(以下SiC/SiC)のハイブリッド材料の製造と評価，大型ヘリカル装置（LHD）におけるプラズマ暴露実験に関わる研究と考察を行なった内容で，全八章からなる。第一章は本論文の背景について述べたものであり，第二章は本研究に関わる過去の文献をまとめて本論文の趣旨・目的を示している。第三章はアーマー材となるタングステン被覆層のSiC/SiC板材上への形成法基礎検討と基礎評価を行なった結果である。ハイブリッド材料の製造は全てホットプレス法で行い，具体的には次の通りに実施した。1）タングステンとSiC/SiC板材同士の拡散接合による製作。更にタングステン板の圧延方向の効果の評価のため，（h）界面に対して平行な方向，（v）界面に対して垂直な方向，の二種類のタングステン板材を用いた。それぞれのハイブリッド材料にIDを振り分け，ID（NITE-W/SiC-Dh1）：平行な圧延方向のタングステン板材の拡散接合，ID（NITE-W/SiC-Dv1）：界面に垂直な圧延方向のタングステン板材の拡散接合とした。また2）SiC/SiCプリフォーム上にタングステン粉末の圧紛層を形成した後に一気に加圧焼結を行い，SiC/SiC板材表面に焼結タングステン層を形成する一体形成法による製作を行なった。これをID（NITE-W/SiC-S2）とした。第四章は製造したハイブリット材料に対する大型ヘリカル装置（LHD）におけるプラズマ暴露実験について記述した。各板材は0.7mmのタングステン層を持つ1.5mmの厚さに加工され，LHD下のダイバーター位置においてプラズマに5.6秒間直接暴露された。ハイブリット板材への平均熱流速は10MW/m2と計算された。第五章は超音波探傷法によりプラズマ暴露後のタングステン，接合界面およびにSiC/SiC複合材料の内部状態の評価を行なった結果を記述した。プラズマの熱流速によりハイブリット板材の界面部分に導入された損傷の解析走査電子顕微鏡（SEM）およびに電子プローブアナライザ（EPMA）で行ない，結果を第六章に示した。更に高温熱処理材との接合界面拡散相の比較を行ない，プラズマ暴露時の接合材の温度状態の推定を試みた。これらの研究成果を踏まえて第七章では議論と考察を行い，第八章において本論文の総括を行なった。","subitem_description_language":"ja","subitem_description_type":"Abstract"},{"subitem_description":"The objectives of the present dissertation are to fabricate hybrid W-SiC/SiC tiles for divertor components in fusion, and to investigate their high heat flux durability to the divertor plasma exposure in the large helical device (LHD). This thesis consists of 8 chapters.  Chapters-1 and -2 introduce the background and previous literatures related to this thesis. Chapter-3 is the material fabrication and properties investigation of the hybrid tiles. Three W-SiC/SiC tiles were successfully fabricated. Two tiles were fabricated by solid state diffusion bonding method. The first tungsten tile used was a horizontal rolled tungsten plate to surface and SiC/SiC composite, this hybrid tile was named as ID (NITE-W/SiC-Dh1). The second tungsten plate used was a vertical rolled plate to surface. The plate was joined to SiC/SiC, and it was named as ID (NITE-W/SiC-Dv1). The third hybrid tile was fabricated by a liquid sintering from tungsten powders and pliable preform of SiC/SiC, with ID (NITE-W/SiC-S2). Hot press method was used for all fabrication. Both tiles of (NITE-W/SiC-Dh1) and (NITE-W/SiC-Dv1) were fabricated with the conditions of pressure up to 20 MPa at 1600oC in argon atmosphere. The last hybrid tile (NITE-W/SiC-S2) was fabricated with the 20MPa at 1800oC in argon atmosphere. These tiles were prepared to screen the appropriate fabrication methods for the plasma facing component production. Macro and micro structure analysis of the tiles fabricated was conducted by an optical microscope, a scanning electron microscope (SEM) and an electro probe micro analysis (EPMA). A High heat flux test was performed for the all tiles and this procedure is described in Chapter-4. The test was performed in the large helical device (LHD) at National Institute of Fusion Science (NIFS). All tiles were thinned to 1.5mm thick tiles which the tungsten armor is adjusted to 0.7mm thick, and set in the sample holder on a manipulator under the LHD. The manipulator lifted the sample holder up to the divertor position and the samples were exposed to plasma. The exposure time was up to 5.6 sec, and the average heat flux load was tentatively calculated to be 10 Mw/m2. Chapter-5 describes the results of ultrasonic images of the exposed tiles. The ultrasonic investigation provided wide range inspection of the total surface area of the exposed tiles, which was useful guide to determine the samples cutting position before subsequent macro and micro structure investigation.  Chapter-6 describes macro and microstructure evolution of W-SiC/SiC tiles after divertor plasma exposure test. This study included the analysis of the irradiated tiles by macro and microstructure to evaluate the degradation of tungsten surface, the diffusion bonding layer at the interface region and SiC/SiC region. Cracks and fiber/matrix interfacial debonding were detected. EPMA study was conducted to investigate the behavior of diffusion through the interface after plasma exposure. The comparison between the micro structure of both the irradiated tiles and heat treated W-SiC/SiC on the interphase region between tungsten and SiC/SiC was performed to estimate the temperature profile during the plasma exposure. Based on the experiment and results, the direction of the processing and the performance of the W-SiC/SiC Hybrid Component were discussed in Chaptet-7, and whole present research is summarized in Chapter-8.","subitem_description_language":"en","subitem_description_type":"Abstract"}]},"item_81_dissertation_number_13":{"attribute_name":"学位授与番号","attribute_value_mlt":[{"subitem_dissertationnumber":"甲第350号"}]},"item_81_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.15118/00005105","subitem_identifier_reg_type":"JaLC"}]},"item_81_text_12":{"attribute_name":"学位の種別","attribute_value_mlt":[{"subitem_text_language":"ja","subitem_text_value":"課程博士"}]},"item_81_text_14":{"attribute_name":"報告番号","attribute_value_mlt":[{"subitem_text_language":"ja","subitem_text_value":"甲第350号"}]},"item_81_text_15":{"attribute_name":"学位記番号","attribute_value_mlt":[{"subitem_text_language":"ja","subitem_text_value":"博甲第350号"}]},"item_81_version_type_24":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"open access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_abf2"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorAffiliations":[{"affiliationNameIdentifiers":[],"affiliationNames":[{"affiliationName":""}]}],"creatorNames":[{"creatorName":"WALEED  ALSAYED MOHREZ MOHAMMAD ABDALLA, ","creatorNameLang":"en"},{"creatorName":"ワリード アルサイド モレス モハメッド アブダラ, ","creatorNameLang":"ja"}],"familyNames":[{},{}],"givenNames":[{"givenName":""},{"givenName":""}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2016-02-15"}],"displaytype":"detail","filename":"A350.pdf","filesize":[{"value":"12.7 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"A350","objectType":"fulltext","url":"https://muroran-it.repo.nii.ac.jp/record/5114/files/A350.pdf"},"version_id":"0a31893e-bbaf-48f8-9e18-eb31653497c0"},{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2016-02-15"}],"displaytype":"detail","filename":"A350_summary.pdf","filesize":[{"value":"413.1 kB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"A350_summary","objectType":"abstract","url":"https://muroran-it.repo.nii.ac.jp/record/5114/files/A350_summary.pdf"},"version_id":"4433ede0-1bbc-47f9-a687-1156c3b76744"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"doctoral thesis","resourceuri":"http://purl.org/coar/resource_type/c_db06"}]},"item_title":"High Heat Flux Durability of W-SiC/SiC Hybrid Component for Nuclear Fusion Applications","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"High Heat Flux Durability of W-SiC/SiC Hybrid Component for Nuclear Fusion Applications","subitem_title_language":"en"},{"subitem_title":"核融合炉用W-SiC/SiCハイブリッド材料の耐熱流束特性の研究","subitem_title_language":"ja"}]},"item_type_id":"81","owner":"18","path":["227"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2013-11-15"},"publish_date":"2013-11-15","publish_status":"0","recid":"5114","relation_version_is_last":true,"title":["High Heat Flux Durability of W-SiC/SiC Hybrid Component for Nuclear Fusion Applications"],"weko_creator_id":"18","weko_shared_id":-1},"updated":"2023-12-13T06:51:43.677364+00:00"}