Article
Chemistry, Physical
Raimundo Silva, Marcos Dantas dos Santos, Rui Madureira, Rui Soares, Rui Neto, Angela Aparecida Vieira, Polyana Alves Radi Goncalves, Priscila Maria Sarmeiro M. Leite, Lucia Vieira, Filomena Viana
Summary: This paper investigates the tribological behavior of Co-Cr-Mo alloy with reduced grain size using electromagnetic stirring. The results show that a smaller grain size leads to lower friction coefficient and wear volume, making Co-Cr-Mo alloy with smaller grain size suitable for biomedical implants.
Article
Chemistry, Physical
Anna Gabriella Camacho Presotto, Jairo Matozinho Cordeiro, Joao Gabriel Camacho Presotto, Elidiane Cipriano Rangel, Nilson Cristino da Cruz, Richard Landers, Valentim Adelino R. Barao, Marcelo Ferraz Mesquita
Summary: This study compared the performance of different production technologies on Co-Cr alloy dental prostheses applications, and found that SLM technology showed excellent surface, microstructural, mechanical, and electrochemical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Daichi Nakato, Masahiko Hatakeyama, Norio Nunomura, Satoshi Sunada
Summary: The corrosion behaviors of Co-Cr-Mo alloys with fcc and hcp structures were studied in a 2.5 M H2SO4 + 0.2 M NaCl solution using polarization tests and weight-loss method. The results showed that the fcc Co-Cr-Mo alloy exhibited better corrosion resistance compared to the hcp Co-Cr-Mo alloy. Additionally, a mixed-phase Co-Cr-Mo alloy with a dominant fcc phase and a small amount of hcp phase displayed similar corrosion resistance to the single-phase fcc alloy.
Article
Engineering, Manufacturing
Z. Wang, S. Y. Tang, S. Scudino, Yu P. Ivanov, R. T. Qu, D. Wang, C. Yang, W. W. Zhang, A. L. Greer, J. Eckert, K. G. Prashanth
Summary: A Co-Cr-Mo alloy with predominantly martensitic structure was produced using selective laser melting (SLM), leading to outstanding tensile properties due to its hierarchical microstructure spanning multiple length scales and internal defects.
ADDITIVE MANUFACTURING
(2021)
Article
Dentistry, Oral Surgery & Medicine
Taghrid Aldhohrah, Jiajun Yang, Jiawen Guo, Hui Zhang, Yan Wang
Summary: The study evaluated the biological effects of cobalt chromium (Co-Cr) ions released from an alloy fabricated from recycled powder on human gingival fibroblasts (HGFs) and normal oral keratinocytes (NOKs). The results showed that the alloy fabricated from recycled powder released more Co and Cr ions and had higher cytotoxicity to the cells.
JOURNAL OF PROSTHETIC DENTISTRY
(2023)
Article
Chemistry, Physical
Wenqi Fu, Shuang Liu, Jun Jiao, Zhiwen Xie, Xinfang Huang, Yun Lu, Huiying Liu, Shuhai Hu, Enjun Zuo, Ni Kou, Guowu Ma
Summary: This study compared the selective laser melting (SLM) and traditional casting (CAST) methods for fabricating dental cobalt-chromium (Co-Cr) alloys and evaluated their microstructure, surface composition, mechanical properties, wear resistance, and biocompatibility. The results showed that SLM alloys had higher hardness, lower friction coefficient, and better wear resistance compared to CAST alloys. Additionally, the SLM alloys exhibited higher cell survival and expression of cell-adhesion-related genes, indicating reduced deleterious effects on cells compared to CAST alloys.
Article
Biochemistry & Molecular Biology
Lukasz Wasyluk, Vitalii Boiko, Marta Markowska, Mariusz Hasiak, Maria Luisa Saladino, Dariusz Hreniak, Matteo Amati, Luca Gregoratti, Patrick Zeller, Dariusz Bialy, Jacek Arkowski, Magdalena Wawrzynska
Summary: The optimized graphene coating on cobalt-chromium alloy using cold-wall chemical vapor deposition method showed potential for medical applications, with studies on mechanical properties and microstructure. The research confirmed the uniformity of the graphene layer and its biocompatibility for potential use in cardiovascular diseases.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Nanoscience & Nanotechnology
Wenting Jiang, Xinglong An, Song Ni, Li Wang, Junyang He, Zibin Chen, Yi Huang, Min Song
Summary: By regulating the substructures, the classical Co25Cr5Mo5W alloy was successfully endowed with an excellent combination of strength and ductility. The study establishes a clear connection between the substructures and the mechanical properties, offering valuable implications for surpassing the current mechanical limitation in the Co-Cr-Mo alloy family.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Coatings & Films
Michel J. R. Hache, Yu Zou, Uwe Erb
Summary: The article documents the formation of mud-cracking networks in coatings and thin films, as well as a previously unreported phenomenon of time-dependent cracking post-deposition, potentially related to oxygen content in the samples. This time-dependent cracking phenomenon may impact the suitability of certain Cr-alloy electrodeposits in some applications.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Engineering, Biomedical
Kyung-Ho Ko, Hyeon-Goo Kang, Yoon-Hyuk Huh, Chan-Jin Park, Lee-Ra Cho
Summary: The mechanical properties and residual stress of dental Co-Cr-Mo alloy are influenced by manufacturing and post-processing methods. Selective laser melting (SLM) manufacturing method produces CCM alloy with superior mechanical properties and residual stress. Heat treatment at temperatures above 950 degrees C helps reduce residual stress and increase ductility.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2022)
Article
Chemistry, Physical
Junsheng Chen, Hao Li, Shuangming Chen, Jingyuan Fei, Chang Liu, Zixun Yu, Kihyun Shin, Zongwen Liu, Li Song, Graeme Henkelman, Li Wei, Yuan Chen
Summary: This study investigates the effect of doping chromium on the activity of cobalt (oxy)hydroxide catalysts through a combination of DFT calculations and catalyst characterization. The results show that the optimal Co5Fe3Cr2 (oxy)hydroxide exhibits superior performance in terms of high current density and turnover frequency. Analysis from X-ray absorption and photoelectron spectroscopies reveals that chromium promotes the distribution of cobalt atoms and modifies the electronic structure. Quasi-operando electron energy loss spectroscopy confirms that chromium accelerates the oxidation of Co2+ to higher valence species, leading to significantly higher catalytic activity.
ADVANCED ENERGY MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Moses J. Paul, V. M. Suntharavel Muthaiah, Suhrit Mula
Summary: In this study, the influence of Mo, V, and Zr on microstructural evolution, thermal stability, and mechanical properties of yttria-dispersed ferritic Fe-14Cr-1Ti-0.25Y(2)O(3) steels was investigated. It was found that the addition of V can improve the thermal stability and mechanical properties of the steel materials compared to Mo/Zr-stabilized alloys.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Review
Thermodynamics
Denis Domonov, Sophiya Pechenyuk, Yuliya Semushina, Nikita Tsvetov, Alexander Belyaevskii
Summary: The thermal decomposition of double complex compounds [Co(NH3)(6)][Cr(CNS)(6)] and [Ni(NH3)(6)](3)[Cr(CNS)(6)](2) was studied in different atmospheres. The decomposition products were identified and their properties were examined. The results showed that the decomposition products of [Co(NH3)(6)][Cr(CNS)(6)] in air were CoSO4 at 500-700 degrees C, and CoCr2O4 and Co2CrO4 at 700-900 degrees C. In argon, unidentified amorphous phases were observed below 500 degrees C, while cobalt and chromium sulfides were formed above 500 degrees C. In a hydrogen atmosphere, a mixture of metals and sulfides was produced. The initial decomposition products of [Ni(NH3)(6)](3)[Cr(CNS)(6)](2) in air were intermediate metal sulfides, which further converted to nickel sulfates and chromates. In argon and hydrogen atmospheres, nickel and chromium sulfides were formed.
THERMOCHIMICA ACTA
(2022)
Article
Chemistry, Multidisciplinary
Maziar Ramezani, Zaidi Mohd Ripin
Summary: This study investigates the sliding wear resistance of a Co-28Cr-6Mo alloy manufactured by laser-based powder bed fusion. The results show that increased loads and sliding speeds result in higher wear rates, while lubrication can decrease the wear rate. The microhardness and coefficient of friction tests provide guidance for selecting suitable operating conditions and lubricants to reduce wear in Co-Cr-Mo alloy applications.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Physical
Ratnesh Kumar Sharma, Randip Kumar Das, Shiv Ranjan Kumar
Summary: The study shows that the addition of chromium in Fe-based coating can enhance hardness, adhesion pull off strength, and wear resistance properties.
SURFACES AND INTERFACES
(2021)