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- W4386003523 abstract "Ceramic-metallic (cermet) fuels are a promising fuel type for space nuclear thermal propulsion (NTP). A key feasibility issue of NTP fuels is the hydrogen chemical compatibility of candidate fuels in the proposed extreme operating temperatures for NTP systems (≥2500 K). In this study, molybdenum matrix cermets containing 40-70 vol% yttria stabilized zirconia (YSZ) particles (as a surrogate for ceramic fuel particles) were produced via spark plasma sintering (SPS) and exposed to flowing hydrogen at high temperature (2000-2630 K). Both steady state and thermally cycled (4 cycles with intermediate cooling to room temperature) conditions were examined for a constant total high temperature exposure duration of 80 min. Following testing, the Mo matrix appears robust in a Mo-YSZ cermet and exhibits acceptable mass loss (<1 wt%) with a sublinear dependence on exposure time (⅓ - ¼ power) based on hydrogen testing at 2500-2630 K with thermal cycling. Moderately higher mass losses were observed for thermally cycled (4 times) vs. isothermal specimens. The subsurface Mo-YSZ interface also remains intact despite indications of debonding at the surface. Significant hydrogen attack occurs on the YSZ particle grain boundaries in the interior of the samples at 2500-2630 K." @default.
- W4386003523 created "2023-08-20" @default.
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- W4386003523 date "2023-12-01" @default.
- W4386003523 modified "2023-10-12" @default.
- W4386003523 title "Corrosion and microstructural characterization of molybdenum cermets following hydrogen exposure up to 2630K" @default.
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- W4386003523 doi "https://doi.org/10.1016/j.jnucmat.2023.154692" @default.
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