Abstract
YH2 bulk is regarded as the most potential metal hydride to be used as neutron moderator of microreactors serving as likely space nuclear power. In this work, YH2-x monoliths are fabricated by spark plasma sintering (SPS) for the first time. Various properties of YH2-x monoliths, including density, density distribution, density uniformity, hydrogen content, and attainable hydrogen density, are measured and calculated systematically. A hydrogen release process is accompanied by the densifying process during SPS. The effective densifying temperature interval is among 700–1000 °C. Steep hydrogen release occurs once the sintering temperature exceeds 900 °C. The microstructural evolution of YH2-x monoliths is also related to the densifying process and the hydrogen release behaviors. Finally, a sintering process analysis of SPS for YH2-x monoliths is discussed and illustrated in detail.
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