AIChE Annual Meeting
Wednesday, November 16, 2022 - 9:24am to 9:45am
This work utilizes incipient wetness impregnation with perrhenic acid to deposit controlled quantities of rhenium upon a tungsten powder substrate. After impregnation, it was observed that 1 wt% rhenium concentrations and higher resulted in the formation of a red precipitate. Powder XRD confirms the red precipitate as crystallized ReO3, which likely formed during the drying process in air. The resulting Re-W powder was crushed, sieved, and ball milled to ensure homogeneity amongst the samples. Inspection by ICP-OES indicated successful incipient wetness impregnation, with the deposited rhenium quantity falling within the expected range of compositions. TOF-SIMS was conducted to determine the nature of the rhenium deposition upon the tungsten substrate. The results demonstrated uniform dispersion of rhenium upon the substrate, which is crucial for the manufacturing of complex tungsten parts.
Conventional pressing and sintering of the Re-W samples will be performed to indicate whether the utilized Re doping strategy affects tungsten densification kinetics or its density post-sintering. Versatile micro-indentation techniques will be utilized to ascertain whether advantageous mechanical properties are achieved. Future work will incorporate Re-W powders into printable inks that can be used to additively manufacture tungsten prototypes to scrutinize against conventionally pressed samples. This work shows a novel approach to rhenium doping that could facilitate the mass fabrication of complex tungsten parts with exceptional properties.