Sealing device of hectowatt-level strontium-90 isotope heat source

The invention is applicable to the technical field of isotope heat sources, and provides a sealing device for a hectowatt-level strontium-90 isotope heat source, comprising: a fuel pellet which is ceramic strontium fluoride; the liner layer wraps and covers the fuel pellet, and the liner layer is made of a 304 stainless steel material; and the stress layer wraps and covers the liner layer, and the stress layer is made of Hastelloy S. According to the invention, by adopting the structural design of the liner layer and the stress layer, the sealing performance can be effectively improved; the liner layer made of the 304 stainless steel material has good sealing performance and corrosion resistance, the fuel pellet and the external environment can be effectively isolated, and nuclear material leakage is prevented. The hastelloy S serves as the stress layer, has excellent corrosion resistance and high-temperature strength and can bear stress in the high-temperature and high-pressure environment, and the sealing p