最新情報
2025年（7月～12月）
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2025.8.6
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2025.8.1
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2025.7.29
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2025.7.28
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2025.7.18
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2025.7.11
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2025.7.2
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2025.8.6
【論文】Materials Today CommunicationsにTi合金の酸化抑制に関する中国東北大との共同研究論文が掲載されました。
Yiming Jin, Jiani Li, Takayoshi Nakano, Hideki Hosoda, Mitsuo Niinomi, Xiaowei Zhang, Deliang Zhang, Xiaoli Zhao*:
Zr-Enhanced Ambient-Air Thermal Oxidation of Ti-30Zr-5Mo Alloy Using Low Tβ for Implants, Materials Today Communications, (2025), Volume 48, 113442.
DOI: https://doi.org/10.1016/j.mtcomm.2025.113442
論文はこちら
PDFはこちら
Abstract
Metastable β-Ti alloy Ti-30Zr-5Mo (Tβ ≈ 700 °C) offers low modulus, biocompatibility, and strength for spinal rod implants but has limited hardness (280 Hv) and wear resistance. Conventional surface treatments like vacuum-based physical vapor deposition (PVD), are costly and complex. This study exploits the low Tβ and high Zr content (30 wt.%) of Ti-30Zr-5Mo alloy for single-step, ambient-air thermal oxidation at 600-700 °C, combining heat treatment with surface modification. The low Tβ ensures controlled oxidation, preventing over-oxidation, while Zr's selective oxidation forms a dense ZrO2-rich layer, which is harder than TiO2, enhancing surface hardness. Spontaneous tetragonal to monoclinic phase transitions in ZrO2 further improve toughness. The resulting 5 μm-thick oxide layers exhibit a threefold hardness increase (904 Hv vs. 280 Hv), a surface roughness of 0.30 μm (suitable for osseointegration), strong interfacial adhesion (critical load: 43 N), and an 18-fold reduction in corrosion current density (from 1.62×10-7 to 8.96×10-9 A·cm-2). Despite minor microcracks, the layers maintain structural integrity, offering exceptional durability. This atmosphere-free approach provides a scalable solution for orthopedic and dental implants, combining mechanical durability with biological integration. The insights into Zr-driven oxidation dynamics at low Tβ could inform vacuum-based processes, when controlled oxygen partial pressure might further optimize oxide layer properties, aligning with advancement in surface technology.
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2025.8.1
【行事】M2の皆さんの就職内々定お祝い会を行いました。
阪急トップビアガーデンにて、就職内々定のお祝い会を開催しました。
M2の皆さん、おめでとうございます！！
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2025.7.29
【論文】Materials Today CommunicationsにTi合金の酸化抑制に関する中国東北大との共同研究論文が出版されました。
Yiming Jin, Jiani Li, Takayoshi Nakano, Hideki Hosoda, Mitsuo Niinomi, Xiaowei Zhang, Deliang Zhang, Xiaoli Zhao*:
Zr-Enhanced Ambient-Air Thermal Oxidation of Ti-30Zr-5Mo Alloy Using Low Tβ for Implants, Materials Today Communications, (2025), 113442.
DOI: https://doi.org/10.1016/j.mtcomm.2025.113442
論文はこちら
Abstract
Metastable β-Ti alloy Ti-30Zr-5Mo (Tβ ≈ 700 °C) offers low modulus, biocompatibility, and strength for spinal rod implants but has limited hardness (280 Hv) and wear resistance. Conventional surface treatments like vacuum-based physical vapor deposition (PVD), are costly and complex. This study exploits the low Tβ and high Zr content (30 wt.%) of Ti-30Zr-5Mo alloy for single-step, ambient-air thermal oxidation at 600-700 °C, combining heat treatment with surface modification. The low Tβ ensures controlled oxidation, preventing over-oxidation, while Zr's selective oxidation forms a dense ZrO2-rich layer, which is harder than TiO2, enhancing surface hardness. Spontaneous tetragonal to monoclinic phase transitions in ZrO2 further improve toughness. The resulting 5 μm-thick oxide layers exhibit a threefold hardness increase (904 Hv vs. 280 Hv), a surface roughness of 0.30 μm (suitable for osseointegration), strong interfacial adhesion (critical load: 43 N), and an 18-fold reduction in corrosion current density (from 1.62×10-7 to 8.96×10-9 A·cm-2). Despite minor microcracks, the layers maintain structural integrity, offering exceptional durability. This atmosphere-free approach provides a scalable solution for orthopedic and dental implants, combining mechanical durability with biological integration. The insights into Zr-driven oxidation dynamics at low Tβ could inform vacuum-based processes, when controlled oxygen partial pressure might further optimize oxide layer properties, aligning with advancement in surface technology.
Keywords
Ti-30Zr-5Mo alloy; Thermal oxidation; Oxidation mechanism; Internal oxidation; Surface modification -
2025.7.28
【論文】Materials Today CommunicationsにTi合金の酸化抑制に関する中国東北大との共同研究論文が受理されました。
Yiming Jin, Jiani Li, Takayoshi Nakano, Hideki Hosoda, Mitsuo Niinomi, Xiaowei Zhang, Deliang Zhang, Xiaoli Zhao*:
Zr-Enhanced Ambient-Air Thermal Oxidation of Ti-30Zr-5Mo Alloy Using Low Tβ for Implants, Materials Today Communications, (2025), in press -
2025.7.18
【書籍】Digitalization in Additive Manufacturing(Edited by Numan M. Durakbasa, Kerim Cetinkaya, Pinar Demircioglu, Ismail Bogrekci)が出版されました。
Gizem Coskun, Muhammed Enes Ilgazi, Asli Gunay Bulutsuz, Sercan Basit, Hasan Sadikoglu, Ozkan Gokcekaya, Takayoshi Nakano, Hakan Yilmazer: Effect of Production Parameters on Additively Manufactured Hastelloy-X Alloy by Selective Laser Melting, in Digitalization in Additive Manufacturing(Edited by Numan M. Durakbasa, Kerim Cetinkaya, Pinar Demircioglu, Ismail Bogrekci), 15 July (2025), pp. 195-204.
eBook ISBN
978-3-031-84873-5
Published: 14 July 2025Series ISSN
2730-9576
Series E-ISSN
2730-9584書籍はこちら
Abstract
Additive Manufacturing (AM), also known as 3D printing, enabled the fabrication of products with complex geometries, layer by layer. It was preferred in various sectors such as aerospace, biomedical, and automotive industries. The formation of different phases in superalloys affected their machinability and contributed to cracking in aerospace applications. Consequently, there has been significant attention on fabricating superalloys with enhanced mechanical and corrosion resistance at high temperatures, especially for parts used in the combustion chambers of turbine engines. Furthermore, microstructural control and preferred orientation (texture) were used in material development to improve performance. In this study, the production parameters of the Selective Laser Melting (SLM) technique for AM were investigated on Hastelloy X superalloys. The study aimed to optimize production parameters by examining the effects of variables such as laser scanning speed (V) on the microstructure and mechanical properties of the material. The microstructures of the produced samples were analyzed using optical microscopy. Hardness measurements were conducted to assess the mechanical properties, while porosity and density, in relation to microstructure, were also examined.
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2025.7.11
【解説】山陽特殊製鋼技報第32巻（2025年6月発行）に中野先生のAMによる金属材料の高機能化に関する寄敲が掲載されています。
中野貴由：
積層造形（Additive Manufacturing）による 金属材料の高機能化、
山陽特殊製鋼技法 特集：部品製造プロセスの革新に寄与する材料技術、 (2025)、Vol.32 No.1、pp.3~24.
https://www.sanyo-steel.co.jp/technology/images/pdf/32/32_03.pdf -
2025.7.2
【論文】バイオフィルムに関する研究が、Transactions of the IMF (YTIM)にOA論文として掲載されました。
Hideyuki Kanematsu*, Shochiku Kure, Risa Kawai, Hidekazu Miura, Takayoshi Nakano:
Antibiofilm Potential of Graphene-Dispersed Alkoxysilane Coatings:
A Materials Science Perspective, Transactions of the IMF (YTIM),
The International Journal of Surface Engineering and Coatings, (2025).
DOI: https://doi.org/10.1080/00202967.2025.2520667
論文はこちら
PDFはこちら
Abstract
This study investigates the antibiofilm properties of alkoxysilane-based coatings incorporating dispersed multilayer graphene powder. Graphene, synthesised via a proprietary method, was incorporated into a resin matrix at various concentrations (0.1%, 0.5%, and 1.0% by weight) and applied to glass substrates. Raman spectroscopy confirmed the presence of defect-rich, multilayer graphene, which is known to enhance antimicrobial surface properties. Biofilm formation by Staphylococcus epidermidis was evaluated using ISO 4768-standardised crystal violet staining. Results indicated that biofilm development was effectively suppressed at concentrations up to 0.5%, whereas an unexpected increase was observed at 1.0%, possibly due to graphene aggregation and reduced surface exposure. The findings suggest that both graphene concentration and dispersion quality critically influence antibiofilm efficacy. The study highlights the dual role of graphene, both as a physical and chemical antibacterial agent, and its potential application in medical, industrial, and hygienic materials. Further investigation is warranted to optimise dispersion and explore microbial-material interactions in real-world conditions.
Keywords
Graphene-dispersed coatings; alkosysilane resin; biofilm suppression; crystal violet assay; Raman spectroscopy
