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| 001 | 1046130 | ||
| 005 | 20251023202106.0 | ||
| 024 | 7 | _ | |a 10.3390/ma18163873 |2 doi |
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| 100 | 1 | _ | |a Nidadavolu, Eshwara |0 P:(DE-HGF)0 |b 0 |e Corresponding author |
| 245 | _ | _ | |a Correlative Raman Spectroscopy–SEM Investigations of Sintered Magnesium–Calcium Alloys for Biomedical Applications |
| 260 | _ | _ | |a Basel |c 2025 |b MDPI |
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| 520 | _ | _ | |a In this study, a correlative approach using Raman spectroscopy and scanning electron microscopy (SEM) is introduced to meet the challenges of identifying impurities, espe- cially carbon-related compounds in metal injection-molded (MIM) Mg-0.6Ca specimens designed for biomedical applications. This study addresses, for the first time, the issue of carbon residuals in the binder-based powder metallurgy (PM) processing of Mg-0.6Ca materials. A deeper understanding of the material microstructure is important to assess the microstructure homogeneity at submicron levels as this later affects material degradation and biocompatibility behavior. Both spectroscopic and microscopic techniques used in this study respond to the concerns of secondary phase distributions and their possible stoichiometry. Our micro-Raman measurements performed over a large area reveal Ra- man modes at ~1370 cm−1 and ~1560 cm−1, which are ascribed to the elemental carbon, and at ~1865 cm−1, related to C≡C stretching modes. Our study found that these car- bonaceous residuals/contaminations in the material microstructure originated from the polymeric binder components used in the MIM fabrication route, which then react with the base material components, including impurities, at elevated thermal debinding and sintering temperatures. Additionally, using evidence from the literature on thermal carbon cracking, the presence of both free carbon and calcium carbide phases is inferred in the sintered Mg-0.6Ca material in addition to the Mg2Ca, oxide, and silicate phases. This first-of-its-kind correlative characterization approach for PM-processed Mg biomaterials is fast, non-destructive, and provides deeper knowledge on the formed residual carbonaceous phases. This is crucial in Mg alloy development strategies to ensure reproducible in vitro degradation and cell adhesion characteristics for the next generation of biocompatible magnesium materials. |
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| 773 | _ | _ | |a 10.3390/ma18163873 |g Vol. 18, no. 16, p. 3873 - |0 PERI:(DE-600)2487261-1 |n 16 |p 3873 - |t Materials |v 18 |y 2025 |x 1996-1944 |
| 856 | 4 | _ | |u https://juser.fz-juelich.de/record/1046130/files/materials-18-03873.pdf |y OpenAccess |
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