Authors:
Louis-Philippe Lefebvre (National Research Council Canada, Canada),
Pelle Mellin (Swerim AB, Sweden),
Annika Talus (RISE KIMAB, Sweden),
Olivier Rigo (Sirris, Belgium),
Louis-Philippe Lefebvre (National Research Council Canada, Canada)
Abstract:
It may be important to monitor moisture in additive manufacturing (AM) feedstocks to make sure the process is robust and the properties of the printed components are stable and as expected. However, there is presently no standard adapted for AM powder feedstocks. Karl Fisher (KF), relative humidity sensors and loss on drying (LOD) were used to monitor moisture in different feedstocks and reference materials. Moisture in as received powders is low in most metallic powders but significantly higher in polymer and ceramics. Both drying and exposure to moisture affect the moisture content. KF and relative humidity sensor results compare well together but the LOD is not sensitive enough when the moisture content is low. The relative standard deviations are decreasing when moisture content increases. Similar procedures and reference materials should be used if results obtained in different laboratories or using different techniques are compared together.
DOI:
https://doi.org/10.59499/WP225370853