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Effects of Precipitant and pH on Coprecipitation of Nanosized Co-Cr-V Alloy Powders

Nanosized Co-Cr-V alloy powders were synthesized via coprecipitation method. Effects of precipitants ((NH(4))(2)C(2)O(4)·H(2)O and Na(2)CO(3)) and pH were investigated by X-ray diffraction (XRD), Zeta potential analyzer, thermogravimetry-differential scanning calorimetry (TG-DSC), inductively couple...

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Detalles Bibliográficos
Autores principales: Chen, Xiaoyu, Li, Yongxia, Huang, Lan, Zou, Dan, Wu, Enxi, Liu, Yanjun, Xie, Yuanyan, Yao, Rui, Liao, Songyi, Wang, Guangrong, Zheng, Feng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5666914/
https://www.ncbi.nlm.nih.gov/pubmed/28934147
http://dx.doi.org/10.3390/ma10101108
Descripción
Sumario:Nanosized Co-Cr-V alloy powders were synthesized via coprecipitation method. Effects of precipitants ((NH(4))(2)C(2)O(4)·H(2)O and Na(2)CO(3)) and pH were investigated by X-ray diffraction (XRD), Zeta potential analyzer, thermogravimetry-differential scanning calorimetry (TG-DSC), inductively coupled plasma-atomic emission spectrometry (ICP-AES) and scanning electron microscopy (SEM). Co-Cr-V alloy powders were consisted of major face-centered cubic Co (fcc Co) and minor hexagonal close-packed Co (hcp Co). Grain sizes of precursors and Co-Cr-V alloy powders were increased with pH value (7–10) within the ranges of 3~39 and 39~66 nm, respectively. Rod-like or granular Co-Cr-V alloy particles were assembled by interconnected nanograins. At pH = 7, Na(2)CO(3) precipitant was found to be beneficial to maintain the desirable composition of Co-Cr-V powders. It was also found that lower pH favors the maintenance of pre-designed composition, while grain coarsens at higher pH. Effects of variation for precipitant and pH on the morphology and composition of Co-Cr-V alloy powder were discussed in detail and relevant mechanism was further proposed.