研究目的
To study the moisture sorption and desorption from an AM filter in order to quantify the possible moisture contribution during the printing process.
研究成果
Filters used in LPBF machines can adsorb moisture during storage unless sealed properly from the atmosphere or stored in zero RH environments. The filter loses some of its adsorbed moisture during both the chamber atmosphere preparation processes of evacuation and inert gas purging. Moisture in the LPBF chamber during processing can arise from the non-dry or a non-preconditioned filter unit. Preconditioning the filter by drying for 5 hrs at 90 °C, successfully removed the entire moisture from the filter.
研究不足
The study focuses on the contribution of cellulosic fibre filters to the moisture content in a LPBF AM system. The exact contribution of the filter to the oxygen content will depend on a number of variables related to the specific LPBF equipment and the laser processing parameters.
1：Experimental Design and Method Selection:
Dynamic vapor sorption (DVS) analysis was used to evaluate the sorption and desorption capability of an industrial AM filter. Real-time moisture monitoring during chamber atmosphere preparation of an industrial AM unit was carried out.
2：Sample Selection and Data Sources:
E 1900L cellulosic filters sourced from Hengst SE, Germany, purchased from Renishaw Canada, Ltd. were used.
3：List of Experimental Equipment and Materials:
Variable pressure Scanning Electron Microscope (SEM) using a Hitachi SU3500, Micromeritics TriStar 3000 gas sorption system, Traceable Memory Hygrometer, DVS Intrinsic Plus apparatus.
4：Experimental Procedures and Operational Workflow:
Filters were characterized with SEM, specific surface area was measured via BET method, DVS was used to measure mass change under controlled temperature and humidity, in situ measurements of RH during the chamber atmosphere preparation were conducted.
5：Data Analysis Methods:
The data was analyzed using the Parallel Exponential Kinetics (PEK) model to fit the data.
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