Preparation And Properties Research Of Hydrogen And Its Isotopes Permeation Glassy Ceramic Barriers

Because of the finite reserves and environmental pollution problem of the fossil energy, the fusion energy and the hydrogen energy are considered as the most promising alternative energy. But under the high-temperature and high-pressure hydrogen and its isotopes atmosphere, the embrittlement of metal structural materials and the permeation and leakage of hydrogen isotopes, which concern the security of personnel and equipments, are the problems that must be solved. Therefore, the research of preparation of hydrogen and its isotopes permeation glassy ceramic barrier on the surface of 316L stainless steel orα-TA1 and characterization of the barrier effect by using hydrogen to simulate hydrogen isotopes has important scientific meanings and practical applying value.0n the basis of principles and methods of composition design for glassy ceramic coating, the specific components of glassy ceramic coatings'glass fit TE94, TG75and SSE126 respectively for titanium and its alloys and 316L stainless steel were finally established upon the applied requirements. By introducing some corresponding oxides with low surface energy as the coating components, the wettability of the coatings to metal substrate was greatly improved. The coating properties of glaze slurries were modified by adding trace water-soluble polymer compound M. Then the homogeneous stable glaze slurries were prepared by controlling the slurries'pH value in two ways. Using the dipping following with spin-coating, the powder coatings were prepared.To follow the way of coating and sintering for twice, the TE94 and SSE126 enamel coating with the thickness of 90-110 micron were prepared after sintering at the setting temperature for a certain time. The dense and well bonding coatings possess the perfect properties of high resistance to ball dropping, thermal shock and high temperature oxidation. Moreover, the self peeling glass ceramic coating TG75 with about 50 micron thickness was prepared on the TA1 substrate by coating and sintering for one time.Hydrogen charging experiments of the coated and uncoated TA1 and 316L stainless steel samples were performed in a Sievert's apparatus. Combined with Vickers microhardness test of the samples with glassy ceramic coating before and after hydrogen charging, it was concluded that the glassy ceramic coatings were effective barrier against hydrogen isotopes permeation. Except for the lose of diffusion shotcut due to the glass structuce of coating, the Si-H or O-H or other bonds formed by the permeated hydrogen molecules into the network of–O-Si-O-B-O- obstacle the permeation of hydrogen so as to increase the activation energy of hydrogen penetration.