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Open AccessArticle

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

1
Hunan Boyun-Dongfang Powder Metallurgy Co., Ltd., Changsha 410083, China
2
School of Materials Science and Engineering, Central South University, Changsha 410083, China
3
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
*
Author to whom correspondence should be addressed.
Materials 2017, 10(10), 1108; https://doi.org/10.3390/ma10101108
Received: 8 August 2017 / Revised: 4 September 2017 / Accepted: 4 September 2017 / Published: 21 September 2017
Nanosized Co-Cr-V alloy powders were synthesized via coprecipitation method. Effects of precipitants ((NH4)2C2O4·H2O and Na2CO3) 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, Na2CO3 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. View Full-Text
Keywords: Co-Cr-V alloy; morphology coarsening; coprecipitation; precursor; nanosize Co-Cr-V alloy; morphology coarsening; coprecipitation; precursor; nanosize
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Chen, X.; Li, Y.; Huang, L.; Zou, D.; Wu, E.; Liu, Y.; Xie, Y.; Yao, R.; Liao, S.; Wang, G.; Zheng, F. Effects of Precipitant and pH on Coprecipitation of Nanosized Co-Cr-V Alloy Powders. Materials 2017, 10, 1108.

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