{"created":"2023-12-04T02:37:13.144614+00:00","id":2000158,"links":{},"metadata":{"_buckets":{"deposit":"b3250f3b-ea3c-4e6a-83fe-78aafde5c0c9"},"_deposit":{"created_by":20,"id":"2000158","owner":"20","owners":[20],"pid":{"revision_id":0,"type":"depid","value":"2000158"},"status":"published"},"_oai":{"id":"oai:muroran-it.repo.nii.ac.jp:02000158","sets":["41:227"]},"author_link":[],"control_number":"2000158","item_81_date_granted_17":{"attribute_name":"学位授与年月日","attribute_value_mlt":[{"subitem_dategranted":"2023-09-25"}]},"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_7":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"学位論文は\nNITE 法で製作した炭素繊維強化 SiC 基複合材料（ C/SiC 複合材料の）の強化\n材に使用する炭素繊維の機械特性や微細組織が C/SiC 複合材料の強度と靭性に及ぼす影響\nについて多面的な評価を行ってまとめたもので、全 7 章からなっている。第 1 章の序論で\n研究背景と把握しておくべき知見を述べている。 C/SIC 複合材料は安価な炭素繊維と耐酸化\n性の SiC マトリックスを組み合わせた材料で、様々な製造方法で 20 世紀から研究されてい\nる材料であるが、本研究の主要テーマであるナノ含侵遷移共晶相法（ NITE 法）で C/SiC 複\n合材料が製作された歴史は無く、中間素材の開発と複合材料の試作の段階にある。概ね\nSiC/SiC 複合材料と炭素繊維強化プラスチックの延長線上の知見 で開発が進められている\nが、強化材である炭素繊維の強度特性や界面反応性の体系的な知見が無い。本章では研究に\nおいて基本となる背景と強化繊維の種類や特徴について述べている。第 2 章では NITE 法に\nよる複合材料の製造法とプロセス条件に伴う評価内容について述べている。特に NITE 法で\nは焼結前のプリプレグの段階で繊維束内部にマトリックス原料を配置するのは課題である\nが、本研究で用いる一方向繊維（ UD のプリプレグへの含侵手法を基礎にして、将来の織布\nへの含侵手法の研究を行っている。第 3 章では室温における機械特性評価で、引張試 験、曲\nげ試験による強度評価と SENB 法による靭性評価を実施している。強度試験における強度と\n弾性率の比較から、製造時に導入されるマトリックスの導入されるクラックの影響を論じ、\n併せて炭素繊維の強度特性が製造プロセスから影響を受けている可能性を指摘した。また\nSENB 試験による靭性評価では炭素繊維の種類によって複合材料のマトリックスクラック形\n成に対する抵抗力に大きな差があることを指摘した。第 4 章は高温エネルギーシステムな\nどでの使用環境における挙動研究のために、 NITE C /SiC 複合材料の高温引張強度研究を行\nってい る。 2 種類の繊維とも 1000 ℃においては室温よりも引張強度と弾性率が向上する。\n1830 ℃で製造された C/SiC 複合材料は室温においては大きな熱ひずみを有するが、高温で\nはひずみが緩和されるので設計における尤度が増加することを示した。第 5 章は走査電子\n顕微鏡と透過電子顕微鏡を用いた微細組織評価である。 SEM によるマトリックスクラックの\n評価から、炭素繊維と SiC マトリックスの熱膨張率差によって、製造時に導入されるマトリ\nックスクラック数が全く異なることを示した。 TEM 観察では、炭素繊維の種類により微細組\n織がアモルファ スから結晶質まで全く異なっており、アモルファス組織の炭素繊維は NITE\n法のプロセスの中で、焼結時の加圧による結晶化、もしくは焼結助剤との化学反応により、\n繊維が大きな損傷を受けることを示し、プロセス時における結晶性繊維の安定性を見出し\nた。第 6 章は高温加圧下における炭素繊維の結晶化挙動を評価するために、熱間等方圧加圧\nによる炭素繊維の処理と引張試験を行って、 NITE プロセス時の高温加圧の影響と、化学反\n応の影響を分けて評価することを試み、第 7 章で総括としている。","subitem_description_language":"ja","subitem_description_type":"Abstract"},{"subitem_description":"This thesis aims to contribute establishment of high performance aerospace system, quality energy source for the future by development advanced ceramic composites. NITE C/SiC composites are expected to have attractive properties due to its high strength at elevated temperature and high toughness due to their carbon fiber reinforcement, but the compatibility of the NITE method and various carbon fibers had not been noted. This thesis focuses on the effect of the mechanical properties of the fibers to the properties of C/SiC composites and discusses the character modifications caused by the NITE process to find out the appropriate carbon fibers. This thesis consists of seven chapters.\nThe chapter 1 is an introduction, where importance of advanced materials developments toward aerospace and energy systems in future. Especially the character and detail of various carbon fibers essential to advance the research are described.\nThe chapter 2 presents the NITE process including outlines of preparation intermediate materials for the production of preforms, sintering method.\nThe chapter 3 cares mechanical property characterization at room temperature of NITE C/SiC composites reinforced various carbon fibers. Tensile and flexural strength evaluations reveal that the strength strongly depends on the carbon fibers, and elastic modulus characterization suggests micro-crack initiation on SiC matrix during the NITE process. Fracture resistance characterization reveals that the pitch-based and having microstructural oriented carbon fibers show high crack propagation resistance while the PAN based one does not though its quasi-elongation behaviors is observed.\nThe chapter 4 cares high temperature tensile tests of the C/SiC composites. The strength and elastic modulus tended to be higher than these at room temperature.\nThe chapter 5 provides microstructural characterization using SEM, TEM and EDX. TEM and EDX observation reveal that grain growth and chemical reactions are different among the fibers. The pitch-based carbon fibers having oriented microstructure have crystalized grains and seem to be stable during the NITE process though slight microstructural modifications are observed on the fiber/matrix interface. The interface of PAN-Based fiber and SiC matrix are significantly reacted and the grains are grown. These suggests to be reason of lower strength of the composite.\nThe chapter 6 provides the investigation of high temperature and pressure effects for carbon fibers. The fibers are treated in a hot-isostatic pressing device and applied high temperature and pressure to distinguish chemical reaction effects during the NITE process.\nThe chapter 7 is summary of the thesis.","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520号"}]},"item_81_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.15118/0002000158","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520号"}]},"item_81_text_15":{"attribute_name":"学位記番号","attribute_value_mlt":[{"subitem_text_language":"ja","subitem_text_value":"甲第520号"}]},"item_81_text_16":{"attribute_name":"研究科・専攻","attribute_value_mlt":[{"subitem_text_language":"ja","subitem_text_value":"工学専攻"}]},"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":[{"creatorNames":[{"creatorName":"Jung, SangHyun","creatorNameLang":"en"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_access","date":[{"dateType":"Available","dateValue":"2023-12-04"}],"displaytype":"detail","filename":"A520.pdf","filesize":[{"value":"13.9 MB"}],"format":"application/pdf","mimetype":"application/pdf","url":{"objectType":"fulltext","url":"https://muroran-it.repo.nii.ac.jp/record/2000158/files/A520.pdf"},"version_id":"345fbbe1-422a-4151-896d-e9b876481dd1"},{"accessrole":"open_access","date":[{"dateType":"Available","dateValue":"2024-05-23"}],"filename":"A520_summary.pdf","filesize":[{"value":"415 KB"}],"format":"application/pdf","mimetype":"application/pdf","url":{"objectType":"abstract","url":"https://muroran-it.repo.nii.ac.jp/record/2000158/files/A520_summary.pdf"},"version_id":"fdee791e-bdc7-44ba-b3aa-b0611dc32401"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"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":"炭素繊維で強化したNITE-SiC基複合材料の強度特性に関する研究","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"炭素繊維で強化したNITE-SiC基複合材料の強度特性に関する研究","subitem_title_language":"ja"},{"subitem_title":"Research of Mechanical Properties of NITE SiC Matrix Composites Reinforced by Carbon Fibers","subitem_title_language":"en"}]},"item_type_id":"81","owner":"20","path":["227"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2023-12-04"},"publish_date":"2023-12-04","publish_status":"0","recid":"2000158","relation_version_is_last":true,"title":["炭素繊維で強化したNITE-SiC基複合材料の強度特性に関する研究"],"weko_creator_id":"20","weko_shared_id":-1},"updated":"2024-05-23T00:21:11.036346+00:00"}