Low-activity vitreous barrier layer capable of preventing hydrogen or hydrogen isotopic from permeation and preparation thereof

Abstract

The invention relates to a low activity glass barrier layer for restraining the penetration of hydrogen or hydrogen isotopes and a preparation method thereof, pertaining to the technique of functional coating on metal surfaces. The glass barrier layer is characterized in that: the surface of a metal substrate is fixedly coated with the glass barrier layer of 50 to 180 Mum; the mismatch degree between the linear thermal expansion coefficient of glass powder and the metal substrate is smaller than 5 percent; components by weight percentage are one of or a plurality of 56 to 61 percent of SiO2, 3 to 10 percent of Cr2O3, TiO2 and WO3, one of or a plurality of 13 to 20 percent of Na2O, K2O and Na3AlF6, one of or a plurality of 5-12 percent of ZrO2 and ZnO, and one of or a plurality of the left percent of Cao, MgO and SrO. The preparation method of the invention has the advantages of being simple and easy for operation with low cost, being applicable to industrialized production, having extremely small mismatch degree of thermal expansion and good combination, preventing the deterioration of mechanical capacity of materials and deterioration of working environment and waste of resources by effectively restraining the penetration of the hydrogen or the hydrogen isotopes to the metal substrate, reducing the absorption of neutrons and the release of harmful rays after nuclear radiation when the coating is in use and enhancing the use temperature of the coating.

Description

Technical field: [0001] The invention relates to surface functional coating technology, and in particular provides a surface coating technology for preventing hydrogen isotope penetration and thermal corrosion for metal structural materials. Background technique: [0002] In thermonuclear weapons and controllable thermonuclear reactor technologies, hydrogen and its isotopes are the most important fuels, and play an important role in the fields of military nuclear technology and fusion energy. At the same time, hydrogen is also one of the most important green energy sources, and the materials and technologies for its transportation and storage are also crucial for the mass use of this green energy. However, hydrogen and its isotopes have strong permeability in most metal materials. The leakage of hydrogen and its radioactive isotopes will not only lead to an increase in fuel feeding, causing serious economic losses, but also cause radioactive pollution to the environment. Pe...

AI Technical Summary

Problems solved by technology

[0003] Now research more ceramic barrier layers such as Al 2 o 3 、Cr 2 o 3 、TiO 2 The main problem of TiC, TiN, SiC and their composite coatings is that there is a large mismatch between the thermal expansion coefficient (TEC) and the substrate. After a certain thermal shock, a large thermal stress is generated between the coating and the substrate. It is easy to cause the coating to separate from the substrate, which affects the barrier effect of the coating's hydrogen resistance and isotope penetration.

Moreover, the preparation process and equipment requirements of some coatings are relatively high, and the production cost is relatively high, which is unfavorable for realizing mass production.