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Kinetic modeling of the leaching of LiCoO2 with phosphoric acid

Publication date: November–December 2020

Source: Journal of Materials Research and Technology, Volume 9, Issue 6

Author(s): Eliana G. Pinna, D. Sebastián Drajlin, Norman Toro, Mario H. Rodriguez

Republished by Plato

Published

on

open access

Abstract

In this article, we analyze the leaching kinetics with phosphoric acid of LiCoO2 samples from spent Li-ion batteries and commercial LiCoO2. The purpose was to study the mechanism by which the extraction reaction of cobalt and lithium is produced from the solid samples. The experimental results showed that raising the temperature and the reaction time contributed to improving both the extraction of Li and Co from the structure. The leaching rate of the metals from both samples in the phosphoric acid solution could be expressed as:

ln1X=b1ln1+b2tb2t1+b2t

. The morphology of the solid revealed that the dissolution reaction of the samples develops from preferential growth of active sites, points susceptible to chemical interaction, occurring in one direction, giving rise to the start and progress of the reaction. The generation of these sites in the LCO-H3PO4 reaction system is of the “sequential” type. The apparent activation energy values for the leaching of Co and Li would indicate that the surface chemical reaction is the rate-controlling step during this dissolution process.

Keywords

LiCoO2

Kinetic model

LIBs

Surface chemical reaction.

© 2020 The Author(s). Published by Elsevier B.V.

Source: https://www.sciencedirect.com/science/article/pii/S2238785420318342?dgcid=rss_sd_all

Material

A comparative study of hot ductility of unadded and Ce-added SA508-4N RPV steels

Publication date: Available online 26 November 2020

Source: Journal of Materials Research and Technology

Author(s): Yu Guo, Yu Zhao, Kai Wang, Shenhua Song

Republished by Plato

Published

on


Elsevier

Available online 26 November 2020

Journal of Materials Research and Technology

open access

Abstract

The hot ductility of the SA508-4N RPV steel samples, unadded and added with 0.015 wt.% Ce, has been investigated in the range 750-1000 oC. The study is carried out by using a Gleeble machine and various evaluation techniques. Between 750 and 1000 oC, the steel is located in the single-phase austenite region. In this region, the unadded steel presents a hot ductility trough between 750 and 900 oC and the reduction of area (RA) at the trough bottom is rather small, being just ∼50% at 850 oC. However, the hot ductility of the steel can be substantially enhanced by a trace addition of Ce, so that the hot ductility trough is eliminated for the Ce-added steel. In the testing temperature range, the RA values of the Ce-added steel are all higher than ∼75%. Microanalysis demonstrates that grain boundary segregation of Ce plays an important role in the improvement of hot ductility by enhancing the intergranular cohesion and thus suppressing the boundary sliding. Furthermore, the initial temperature of dynamic recrystallization occurrence can be lowered to ∼850 oC from ∼900 oC by the Ce addition. This implies that Ce can also facilitate the occurrence of dynamic recrystallization of SA508-4N RPV steel, thereby raising its hot ductility performance.

Keywords

Hot ductility

RPV steels

Grain boundary sliding

Grain boundary Segregation

Dynamic recrystallization

© 2020 The Author(s). Published by Elsevier B.V.

Source: https://www.sciencedirect.com/science/article/pii/S223878542032024X?dgcid=rss_sd_all

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Material

Architectural design of Ti6Al4V scaffold controls the osteogenic volume and application area of the scaffold

Publication date: Available online 26 November 2020

Source: Journal of Materials Research and Technology

Author(s): Linlin Liu, Su Wang, Juncai Liu, Fuyuan Deng, Zhong Li, Yongqiang Hao

Republished by Plato

Published

on


Elsevier

Available online 26 November 2020

Journal of Materials Research and Technology

open access

Abstract

The geometry of porous bone scaffolds has an important effect on its bone ingrowth, but there is still a lack of in-depth research on this aspect. This study establishes a curved structure and a strut structure with a porosity of 65% and a pore size of 650 μm. The rabbit femoral condyle implants were used to assess the bone ingrowth. The pressure cloud chart and the velocity streamline inside the scaffold structure were calculated by computational fluid dynamics (CFD). The results show that the osteogenic property of a curved structure is better than that of a strut structure, but the mechanical property is not as good as that of the strut structure. The velocity streamline and velocity difference inside the scaffold structure has a great influence on bone ingrowth. Under the same condition, the smaller the fluid velocity difference inside the scaffold structure, the larger the fluid flow area, and the better the bone tissue growth. Studies have shown that the geometry of the bone scaffold can be optimized according to different implantation sites to meet the requirements of different implantation sites.

Keywords

Scaffold architectural

Computational fluid dynamics

Bone ingrowth

Ti6Al4V

© 2020 The Author(s). Published by Elsevier B.V.

Source: https://www.sciencedirect.com/science/article/pii/S2238785420320275?dgcid=rss_sd_all

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Material

Erratum to “Enhancement in dielectric and optical properties of La1-xCexFeO3 nanoparticles” [J Mater Res Technol. 2019; 8(6): 5396–5404]

Publication date: November–December 2020

Source: Journal of Materials Research and Technology, Volume 9, Issue 6

Author(s): M.M. Arman, S.I. El-Dek

Republished by Plato

Published

on

ScienceDirect ® is a registered trademark of Elsevier B.V.

Source: https://www.sciencedirect.com/science/article/pii/S2238785420319359?dgcid=rss_sd_all

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