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

被引：5

作者：

Chen, Xiaoyu ^{[1
,2
]}

Li, Yongxia ^{[1
]}

Huang, Lan ^{[1
,3
]}

Zou, Dan ^{[1
]}

Wu, Enxi ^{[1
]}

Liu, Yanjun ^{[1
]}

Xie, Yuanyan ^{[1
]}

Yao, Rui ^{[1
,2
]}

Liao, Songyi ^{[1
,2
]}

Wang, Guangrong ^{[1
,2
]}

Zheng, Feng ^{[1
,2
,3
]}

机构：

[1] Hunan Boyun Dongfang Powder Met Co Ltd, Changsha 410083, Hunan, Peoples R China

[2] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China

[3] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China

来源：

MATERIALS | 2017年 / 10卷 / 10期

基金：

国家高技术研究发展计划(863计划);

关键词：

Co-Cr-V alloy; morphology coarsening; coprecipitation; precursor; nanosize; COBALT-BASED SUPERALLOY; MAGNETIC-PROPERTIES; DEFORMATION-BEHAVIOR; MO ALLOY; NI; CATALYST; ELECTRODEPOSITION; NANOSTRUCTURES; PARTICLES; NANOWIRES;

D O I：

10.3390/ma10101108

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Nanosized Co-Cr-V alloy powders were synthesized via coprecipitation method. Effects of precipitants ((NH4)(2)C2O4<bold>H</bold>2O 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 similar to 39 and 39 similar to 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.

引用

页数：14

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