Moisture content analysis of metal powders using oven desorption followed by Karl Fischer titration

Autor: Pelle Mellin, Tommy Zavalis, Linnéa Tingö, Håkan Brodin, Johan Wendel, Sigurd Berg, Dmitri Riabov, Annika Strondl, Lars Nyborg
Rok vydání: 2020
Předmět:
Zdroj: Metal Powder Report. 75:34-39
ISSN: 1873-4065
0026-0657
Popis: In this paper, we use Oven Desorption followed by Karl Fischer Titration (KF), to measure moisture content in metal powder. In a PBF-LB Hastelloy X powder, from a newly opened container, we found 28.8 ppm (or µg/g). In a stored PBF-EB powder we found 13.7 ppm. In a stored HIP powder we found 6.7 ppm. This method heats a powder sample inside a hermetically closed vial, in an oven. At the same time an inert gas flow enters, flushes out the desorbed water and exits the vial, via a double hollow needle. The gas–water mixture that exits is directed to the Karl Fischer Titration, where the desorbed moisture is quantified. Included is also a comparison with thermogravimetric analysis (TGA) and a climate chamber moisturization experiment of a PBF-LB HX powder followed by KF analysis. After the moisturization and KF analysis, the same powder was characterized in terms of oxygen content.
Databáze: OpenAIRE
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