Guide for the evaluation of moisture (i.e. water) content in powders used as feedstock for additive manufacturing processes.
Karl Fisher; gravimetric; relative humidity sensor; Loss on drying; TGA:
It is recognized that humidity affects the additive manufacturing (AM) process reliability, stability and productivity. It may also impact part integrity, composition and properties. Although various standards exist to measure moisture content in different materials, there is presently no standard specifically adapted for AM powder feedstocks. America Makes & ANSI Additive Manufacturing Standardization Collaborative (AMSC) stressed the importance of controlling and measuring humidity and moisture at different occasions in their roadmap and monitoring of moisture in AM powder feedstock is linked to different standardization gaps. Recent studies pointed out the difficulties of measuring the small amount of water adsorbed by AM powders. This new standards aims at provide guidelines to follow when monitoring moisture in AM powder feedstock. The objective is to provide parameters to consider when conducting the measurements and recommend methodology adapted for the measurement of moisture in AM powder feedstock.
The title and scope are in draft form and are under development within this ASTM Committee.
Developed by Subcommittee: F42.01
Staff Manager: Pat Picariello
Date Initiated: 08-23-2021
Technical Contact: Louis-Philippe Lefebvre
Ballot: F42 (22-09)
Status: Negative Votes Need Resolution