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沉淀剂和pH值对纳米Co-Cr-V合金粉末共沉淀的影响。

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

作者信息

Chen Xiaoyu, Li Yongxia, Huang Lan, Zou Dan, Wu Enxi, Liu Yanjun, Xie Yuanyan, Yao Rui, Liao Songyi, Wang Guangrong, Zheng Feng

机构信息

Hunan Boyun-Dongfang Powder Metallurgy Co., Ltd., Changsha 410083, China.

School of Materials Science and Engineering, Central South University, Changsha 410083, China.

出版信息

Materials (Basel). 2017 Sep 21;10(10):1108. doi: 10.3390/ma10101108.

DOI:10.3390/ma10101108
PMID:28934147
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5666914/
Abstract

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 339 and 3966 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.

摘要

通过共沉淀法合成了纳米尺寸的钴铬钒合金粉末。利用X射线衍射（XRD）、Zeta电位分析仪、热重-差示扫描量热法（TG-DSC）、电感耦合等离子体原子发射光谱法（ICP-AES）和扫描电子显微镜（SEM）研究了沉淀剂（草酸铵一水合物和碳酸钠）和pH值的影响。钴铬钒合金粉末由主要的面心立方钴（fcc Co）和少量的六方密堆积钴（hcp Co）组成。前驱体和钴铬钒合金粉末的晶粒尺寸在pH值（7-10）范围内分别在339和3966 nm范围内随pH值增加而增大。棒状或颗粒状的钴铬钒合金颗粒由相互连接的纳米晶粒组装而成。在pH = 7时，发现碳酸钠沉淀剂有利于保持钴铬钒粉末的理想组成。还发现较低的pH值有利于维持预先设计的组成，而在较高的pH值下晶粒会粗化。详细讨论了沉淀剂和pH值变化对钴铬钒合金粉末形态和组成的影响，并进一步提出了相关机理。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3833/5666914/749d9ea4f5b5/materials-10-01108-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3833/5666914/9b68aa513c08/materials-10-01108-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3833/5666914/ac770429af8d/materials-10-01108-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3833/5666914/52476231eadc/materials-10-01108-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3833/5666914/feb8e6ac7b3e/materials-10-01108-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3833/5666914/0af6ae677808/materials-10-01108-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3833/5666914/0b6a04b21aee/materials-10-01108-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3833/5666914/d5121a854584/materials-10-01108-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3833/5666914/749d9ea4f5b5/materials-10-01108-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3833/5666914/9b68aa513c08/materials-10-01108-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3833/5666914/ac770429af8d/materials-10-01108-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3833/5666914/52476231eadc/materials-10-01108-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3833/5666914/feb8e6ac7b3e/materials-10-01108-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3833/5666914/0af6ae677808/materials-10-01108-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3833/5666914/0b6a04b21aee/materials-10-01108-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3833/5666914/d5121a854584/materials-10-01108-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3833/5666914/749d9ea4f5b5/materials-10-01108-g008.jpg

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