【公開日：2025.06.10】【最終更新日：2025.05.09】
課題データ / Project Data
課題番号 / Project Issue Number
24UT0069
利用課題名 / Title
Ceramic processing
利用した実施機関 / Support Institute
東京大学 / Tokyo Univ.
機関外・機関内の利用 / External or Internal Use
内部利用（ARIM事業参画者以外）/Internal Use (by non ARIM members)
技術領域 / Technology Area
【横断技術領域 / Cross-Technology Area】（主 / Main）計測・分析/Advanced Characterization（副 / Sub）-
【重要技術領域 / Important Technology Area】（主 / Main）次世代ナノスケールマテリアル/Next-generation nanoscale materials（副 / Sub）-
キーワード / Keywords
Non-metallic structural materials,X線回折/ X-ray diffraction,ナノ粒子/ Nanoparticles,集束イオンビーム/ Focused ion beam
利用者と利用形態 / User and Support Type
利用者名（課題申請者）/ User Name (Project Applicant)
ＹＯＯ ＫＹＵＮＧＨＹＥＯＮ
所属名 / Affiliation
東京大学大学院工学系研究科総合研究機構
共同利用者氏名 / Names of Collaborators in Other Institutes Than Hub and Spoke Institutes
ARIM実施機関支援担当者 / Names of Collaborators in The Hub and Spoke Institutes
府川和弘,飯盛桂子
利用形態 / Support Type
（主 / Main）機器利用/Equipment Utilization（副 / Sub）,技術補助/Technical Assistance
利用した主な設備 / Equipment Used in This Project
報告書データ / Report
概要（目的・用途・実施内容）/ Abstract (Aim, Use Applications and Contents)
Zirconia is a ceramic widely used in various fields, such as biomaterials and catalysts, etc. It is commonly divided into three phases: monoclinic, tetragonal, and cubic phases. The phase stability mainly depends on the heating temperature. The monoclinic phase is most stable at temperatures below 1150 to 1200 degrees. Most of the previous studies focused on the tetragonal phase with yttria doping since it shows the transformation hardening, which improves the mechanical properties of zirconia. Therefore, the yttria-stabilized zirconia has been studied and commercially used. However, this tetragonal phase is metastable at the low temperature. This study focused on the monoclinic zirconia sintered body by studying its microstructure. We used the monoclinic zirconia powder and controlled the sintering process to get fully dense monoclinic zirconia ceramics. In the first step of this study, we identify the density and crystal structure of zirconia sintered body.
実験 / Experimental
The monoclinic zirconia powder was used. To make a green body, we conducted two types of pressing: conventional pressing at 68.6 MPa and cold isostatic pressing at 300 MPa after conventional pressing. Then, they were sintered at 1200 degrees for 2 hours to make dense sintered bodies. First, we checked its apparent density by measuring its size and weight. Then, we conducted XRD measurements(SmartLab 3kW) to analyze the crystal structures of these two.
結果と考察 / Results and Discussion
Figure 1 shows the sintered bodies. The sintered body with the conventional pressing has about 90% apparent density. The sintered body with CIP processing has a higher apparent density than the other one, which is about 97%. The XRD data for the monoclinic zirconia sintered bodies is shown in Figure 2. This figure revealed main peaks for the monoclinic phase at 28.16 degrees, 31.46 degrees, and 34.14 degrees. The highest peak is related to the (1 ̅ 1 1) plane, (1 1 1) plane, and (0 0 2) plane of monoclinic zirconia (PDF # 01-087-7154). All the peaks are in the same positions regardless of the CIP processing. However, the peak at (1 ̅ 1 1) plane for a sintered body after CIP has a lower intensity than the conventional sintered one, while the intensities of the other two peaks are almost the same. Both samples with and without CIP processing show only the monoclinic phase rather than the tetragonal phase. The microstructures of these samples will be investigated in the future.
図・表・数式 / Figures, Tables and Equations
Fig. 1. Sintered bodies of zirconia, with and without CIP processing
Fig. 2. XRD results of zirconia sintered bodies, with and without CIP processing.
その他・特記事項（参考文献・謝辞等） / Remarks(References and Acknowledgements)
成果発表・成果利用 / Publication and Patents
論文・プロシーディング（DOIのあるもの） / DOI (Publication and Proceedings)
口頭発表、ポスター発表および、その他の論文 / Oral Presentations etc.
特許 / Patents
特許出願件数 / Number of Patent Applications：0件
特許登録件数 / Number of Registered Patents：0件