Stability of ZrCo and ZrNi to Heat Cycles in Hydrogen Atmosphere

Kuniaki Watanabe1); Masanori Hara1); Masao Matsuyama1); Isao Kanesaka2); Toshiki Kabutomori3)

doi:dx.doi.org/10.13182/FST95-A30614

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Stability of ZrCo and ZrNi to Heat Cycles in Hydrogen Atmosphere

Kuniaki Watanabe1), Masanori Hara1), Masao Matsuyama1), Isao Kanesaka2), Toshiki Kabutomori3)

Fusion Science and Technology / Volume 28 / Number 3P2 / October 1995 / Pages 1437-1442

Tritium Storage, Distribution, and Transportation / Proceedings of the Fifth Topical Meeting on Tritium Technology In Fission, Fusion, and Isotopic Applications Belgirate, Italy May 28-June 3, 1995 / dx.doi.org/10.13182/FST95-A30614

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The stability of ZrNi and ZrCo to heat cycles in hydrogen atmosphere was studied through changes in absorption-desorption characteristics and in crystallo-graphic structures. ZrCo easily lost its absorption- desorption capacity of hydrogen below 30 heat cycles between room temperature and a given temperature in a range of 400 ∼600 °C. X-ray diffraction analysis showed that ZrCoH₃ initially formed decomposed to ZrH₂+ ZrCo₂. On the other hand, ZrNi was more durable than ZrCo to the similar heat cycles. But, it was found that the absorption-desorption characteristics was degraded by heat cycles over 500. The X-ray analysis showed that ZrNi also dispropor-tionated to ZrH₂ and ZrNi₃. The difference in the stabilities between the two materials appears to be due to the difference in crystallographic nature upon formation of the respective hydrides.