中南大学学报（自然科学版）2017，Vol.48Issue(2)：302-309,8.DOI:10.11817/j.issn.1672-7207.2017.02.005
超细Co-Cr-V复合金属粉末的制备与表征
Preparation and characterization of ultrafine Co-Cr-V alloy powders
摘要
Abstract
Ultrafine complex basic cobalt carbonate and Co-Cr-V alloy powders were prepared by co-precipitation and thermal decomposition method. X-ray diffraction (XRD) and infrared spectroscopy (IR) were used to analyze phase and crystal structure of as-synthesized powders, and inductively coupled plasma atomic emission spectrometer (ICP-AES) was used to determine element composition and content of alloy powders. The results show that the precursor can be indexed to pure phase of basic cobalt carbonate while alloyed powders consist of two cobalt phases corresponding toα-Co (fcc) and β-Co (hcp) respectively. The maximum content of α-Co reaches 82% (mass fraction) at pH=11. Combined the analysis of thermogravimetry-differential scanning calorimetry (TG-DSC), precursor powders were conducted in flowing argon with two characteristic peaks occurring at 259 and 951℃ associated to decomposition of basic cobalt carbonate. Scanning electron microscopy (SEM) was employed to observe the morphology change of as-synthesized powders and alloy powders. Specific surface area analyzer was used to determine the specific surface area of precursor and alloy powders. The precursor powders is extremely fine with average particle size ranged from 5~11 nm. The average particle size of alloy powders is much larger and in sub-micrometer range. The average particle size is a linear function of pH with the smallest partice size of 96 nm observed at pH=7.关键词
共沉淀-热分解法/超细粉末/置换固溶体/类球状Key words
co-precipitation and thermal decomposition method/superfine powders/substitutional solid solution/spherical-like分类
通用工业技术引用本文复制引用
陈晓宇,李詠侠,邹丹,刘艳军,谢元彦,刘宇尘,姚锐,廖松义,郑峰..超细Co-Cr-V复合金属粉末的制备与表征[J].中南大学学报（自然科学版）,2017,48(2):302-309,8.基金项目
国家高技术研究发展计划(863计划)项目(2013AA032001) （863计划）
中南大学粉末冶金国家重点实验室开放研究课题(Project(2013AA032001) supported by the National High Technology Research and Development Program (863 Program) of China （Project(2013AA032001）
Project supported by Open Foundation of State Key Laboratory of Powder Metallurgy, Central South University) （）
