{"created":"2023-06-19T10:29:23.726914+00:00","id":9228,"links":{},"metadata":{"_buckets":{"deposit":"65682a1a-1ae3-419b-8588-9612151ec85c"},"_deposit":{"created_by":18,"id":"9228","owners":[18],"pid":{"revision_id":0,"type":"depid","value":"9228"},"status":"published"},"_oai":{"id":"oai:muroran-it.repo.nii.ac.jp:00009228","sets":["41:227"]},"author_link":["55554"],"item_81_date_granted_17":{"attribute_name":"学位授与年月日","attribute_value_mlt":[{"subitem_dategranted":"2017-03-23"}]},"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":"環境を維持しながら豊かな生活を持続・発展させるために必要なエネルギーの安定供給には、革新的新素材が不可欠である。原子力・核融合エネルギー用に開発された高結晶性SiC/SiC複合材料の製法を、より一般的工業材料とする製法へと構築し、広範な環境・エネルギーシステムに適用可能な段階に移行させるプロセス技術研究の成果が本論文であり、全6章で構成されている。\n第1章は本研究の序論であり、将来の環境保全とエネルギー供給を両立させる環境・エネルギーシステムの必要性と、その基幹技術としてのSiC/SiC複合材料の基本的特性、諸製法の分類、金属材料に代わるセラミック系新素材として開発されてきたSiC/SiC複合材料についてまとめ、本論文の導入としている。\n第2章では、SiC/SiC複合材料の製法の一つであるNITE法について、ラボスケールの手作業による材料製造を、工業的製造技術として成立させるための新しいプロセス概念を示し、その核心技術として中間素材および予備成形体製造技術についての詳細を述べている。新プロセスである1）スラリー、2）グリーンシート、3）プリプレグシート、4）プリフォーム、の各段階について、理論からの技術構築を試み、構造材料を目的とした高密度・高強度SiC/SiC複合材料の安定生産のための技術基盤を構築している。この知見を元にDEMO-NITE法と称する大量生産可能なプリフォームの連続製造プロセスの提案を行っている。\n第3章では金属材料の代替材料としてSiC/SiC複合材料に要求される気密性の確保に関する技術検討を行っている。NITE法に本研究で研究している中間素材製造技術を融合させることで、金属材料を超える気密性を確保し得ることを示した。管材に対する評価法を提案し、詳細な微細組織評価を基盤にして気密性の微細組織・プロセス依存性や、リーク経路と組織との相関を考察しまとめている。\n第4章では環境・エネルギーシステムで必ず必要とされる耐熱性と化学安定性について、特に過酷環境での使用という観点から、原子炉内での中性子照射下での炉水環境での化学的安定性、航空宇宙機用のラムジェット火炎暴露環境下での化学安定性と耐熱性、過酷事故時を想定した超高温水蒸気環境下での化学安定性について、新提案の実験法と海外での貴重ともいえる実験でデータを取得し、本手法で製作されたSiC/SiC複合材料の優れた特性を示し、併せて環境・エネルギーシステム設計に有効な基礎データの提示を行なっている。第5章では本研究で開発したSiC/SiC複合材料の環境・エネルギーシステムへの応用研究を紹介している。事故耐性に優れた燃料被覆管、素粒子研究のための高エネルギー加速器用ターゲット、将来の地熱発電方法として期待されている地熱発電用同軸熱交換器への応用について解説と現状を報告している。\n第 6 章はこの論文のまとめである。\nThis thesis cares establishment of high quality energy source for the future, where advanced materials to meet requirements for advanced energy system. As an attractive and potential material for advanced environment conscious energy systems, a SiC/SiC composite material process development was studied. This thesis consists of seven chapters.\nThe chapter 1 is an introduction, where importance of advanced materials development toward continuous growth of sustainable society on earth, is emphasized. Then background and objective of this study are explained. The essential needs of advanced material are described, and benefits of replacement of metallic materials to ceramics and ceramic composite materials are emphasized. The importance of SiC/SiC composite materials and international R & D activity of SiC/SiC composite, especially for advanced energy systems, are summarized.\nThe chapter 2 presents a new process concept aiming improvements of important properties of SiC/SiC composites, where optimization of intermediate material process and preform fabrication process are emphasized. The new continuous process, which is named as DEMO-NITE process, for large scale production with excellent properties is proposed. And the current status of demo-plant development is summarized.\nThe chapter 3 cares hermeticity of SiC/SiC composite as an important property for application to advanced energy systems. A new test method development of gas leak tightness and its results are provided. Referring process dependence, the leak path analysis and microstructure analysis, excellent gas leak tightness of NITE SiC/SiC materials developed are summarized.\nThe chapter 4 cares high temperature resistance and chemical stabilities of SiC/SiC composite for application to advanced energy systems. New test methods for high temperature resistance specific for many advanced energy systems are developed and the results are provided. The excellent properties against very high temperature steam, water quenching from very high temperature, cyclic exposure to very high temperature with water quenching and flame exposure to scram-jet are described.\nThe chapter 5 provides typical applications of DEMO-NITE SiC/SiC composite. Those are accident tolerant fuels, high energy accelerator target, and dual coaxial heat exchanger for geothermal system. The new evaluation method development, the results and discussion are provided and the excellence of DEMO-NITE SIC/SiC for those applications is summarized.\nThe chapter 6 is summary of this thesis, emphasizing the leading results on DEMO-NITE process development, new evaluation method developments and developments of new and advanced application areas. 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