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Porous ZrC/C targets for radioactive ion beam production synthesized via in-situ carbothermal reduction of pressed and mould-casted pellets
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J
DOI：10.1016/j.jeurceramsoc.2026.118725.png)
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Abstract
En 中文
Porous ZrC/C ceramics were developed for Isotope Separation On-Line (ISOL) facilities through in-situ carbothermal reduction of ZrO₂ with graphite or carbon black. Conventional pressing and mould casting with 30 vol% polyamide pore formers were used for green pellet fabrication, with ZrO₂/C molar ratios of 1:4 or 1:5. Pressureless SPS at 2000 °C enabled synthesis of porous ZrC/graphite targets with tailored microstructure. Complete carbothermal reduction was achieved with low oxygen content (<1.5 wt%) and ZrCx was produced. Mould-casted pellets exhibited higher open porosity up to 61% with a multimodal pore size distribution, whereas pressed pellets had a bimodal pore network. The ZrC grain size of 2–5 µm was well below the limit for efficient isotope release. High-temperature testing at 1800 °C for 15 h in high vacuum demonstrated structural integrity and limited microstructural degradation, with excess graphite hindering densification.
Keywords:
ISOL
ZrC
Sintering
ZrO2
Graphite
Pore formers
Carbothermal reduction
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6.2
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1.7W
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5.1W
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