Studies of glass ceramic coating effect (Cr2O3-SiO2-P2O5) on permeation parameters of hydrogen isotopes through F82H steel

Full text: Using of tritium breeding liquid metal systems (Li, PbLi17) in some types of future fusion devices arise additional demands to blanket structural materials. One of the problems here is the creation of structure material or material with protective barrier, having minimal possible value of tritium permeation through itself or having maximal permeation reduction factor (PRF). Steel F82H is supposed to be used as a blanket structure material of fusion machine. Presented work shows the experiments results on studies of glass ceramic coating over F82H steel. The tests were carried out within temperature range 673-873 K at hydrogen outlet pressure of 1000-1500 Pa. The constant of deuterium permeation was calculated using experiment results for low activated steel F82H with Cr2O3 - SiO2 - P2O5 glass ceramic coating from outlet side of sample. PRF of coating under investigation was calculated relatively to outlet. Experimental results show, that given coating are in an accord with all demands, concerned with development of protective coating, which decrease the tritium leakage from fusion device blanket