Research on Crack-Filling Heat Treatment and Hydrogen Permeation Test of Self-healing Tritium Permeation Barriers

摘要

A TiC?+?mixture (TiC/Al~(2)O~(3)(1:1?wt.%)) +Al~(2)O~(3)self-healing triple layer coating (TLC) was designed and manufactured by our group, and the crack-filling heat treatment process had been roughly explored in the past. In this work, the accelerating test with a thick TiC?+?mixture (TiC/Al~(2)O~(3)(1:1?wt.%)) double-layer coating (DLC) was carried out. The DLC coating warped when the heat treatment temperature was lower than 550?°C, which was rare in similar researches, and it crushed into fan-shaped pieces when the treatment temperature was higher than 650?°C. The two different spalling failures were explained by weight gain, porosity and stress analyses. The heating rate had a significant effect. The bonding strength and hydrogen permeation of the TLC samples were also tested. Remaining at 650?°C for 40?h was proved to be an optimal crack-filling heat treatment process, considering the hydrogen resistance.