摘要
本工作提出利用分步酸溶法准确提取镍基高温合金粉末中非金属夹杂物,实现夹杂物的定量表征。首先选用最佳配比为HCl:HNO3=6:1的混合浓酸溶解镍基高温合金粉末,然后利用H2O2-草酸体系和稀酸将酸溶产物和难溶金属元素完全溶解。利用SEM、EDS等表征手段分析了最终获得的非金属夹杂物的数量、形貌、成分和尺寸分布。结果表明,该方法具有简便快速、分离效率高、回收率高、对非金属夹杂物的影响较小、可提取夹杂物粒径范围广等优点。此外,本研究还对比了分步酸溶法和水淘洗法的提取效果,发现分步酸溶法对粒径大于50μm的夹杂物提取效果与常用的水淘洗法基本一致,而对粒径小于50μm的夹杂物提取效果显著提升。
A stepwise acid dissolution method to extract non-metallic inclusions accurately in nickel-based superalloy powders for quantitative characterization was proposed in this work. The superalloy powder was firstly dissolved by the mixed concentrated acid with the optimal ratio of HCl:HNO=6:1, and the acid soluble products and insoluble metal elements were then completely dissolved using the HO-oxalic acid system and dilute acid. The quantity, morphology, composition, and size distribution of the acquired non-metallic inclusions were analyzed by SEM, EDS and other characterization methods. The results indicate that this extraction method has the advantages of simplicity, short time, high separation efficiency, high recovery rate, and less influence on the inclusions. It is suitable for extracting a wide range of inclusion particle sizes. In addition, the extraction effects of the stepwise acid dissolution method and the water elutriation method were compared. It is found that both methods have similar extraction effects for the inclusions with a particle size greater than 50 μm. However, the stepwise acid dissolution method exhibits significantly improved extraction effects for the inclusions less than 50 μm.
作者
钟伟杰
焦东玲
刘仲武
刘娜
李周
张国庆
Zhong Weijie;Jiao Dongling;Liu Zhongwu;Liu Na;Li Zhou;Zhang Guoqing(School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,China;Science and Technology on Advanced High Temperature Structural Materials Laboratory,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2022年第7期2617-2624,共8页
Rare Metal Materials and Engineering
基金
国家重点研发计划(2019YFA0705300)。
关键词
镍基高温合金
粉末
夹杂物
定量表征
分步酸溶法
nickel-based superalloy
powder
inclusions
quantitative characterization
stepwise acid dissolution
