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Materials 2017, 10(10), 1108;

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

Hunan Boyun-Dongfang Powder Metallurgy Co., Ltd., Changsha 410083, China
School of Materials Science and Engineering, Central South University, Changsha 410083, China
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
Author to whom correspondence should be addressed.
Received: 8 August 2017 / Revised: 4 September 2017 / Accepted: 4 September 2017 / Published: 21 September 2017
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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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