Thread Content
I. Performance of GH3535 nickel-based alloy, a mainstream material for engineering applications: This is a core structural material developed independently in China; in a high-temperature molten salt environment at 700°C, its annual corrosion rate is only about 2 micrometers, which is less than 1/4 of the diameter of a human hair. Application scenarios: It has been widely used in core components such as the main vessel, heat exchangers, and main pipelines of thorium-based molten salt experimental reactors, with domestic supply accounting for over 95%. Performance of Hastelloy-N: A classic corrosion-resistant nickel-based alloy developed initially by the Oak Ridge Laboratory in the United States; its resistance to molten salt corrosion is enhanced by the addition of trace amounts of titanium. Application scenarios: Suitable for fluoride molten salt systems such as FLiBe; it was the main structural material in early molten salt experimental reactors. II. Advanced alloys in cutting-edge research and development: Refractory high-entropy alloys. Representative systems: Body-centered cubic high-entropy alloys such as NbTaMoW and NbTaMoWV. Performance advantages: It boasts excellent high-temperature thermal stability, mechanical strength, and resistance to neutron irradiation, as well as outstanding corrosion resistance in FLiBe molten salts. Molybdenum-based corrosion-resistant alloys: Design objectives – intended for use in ultra-high-temperature fluoride melt environments above 700°C, meeting the ASME specifications regarding mechanical properties at high temperatures, and suitable for the extreme operating conditions of future commercial molten salt reactors. III. Supporting protective coating material: NiCrAlYSi coating. Primary function: Prepared on the surface of GH3535 alloy using arc ion plating, it forms a dense Cr₃Te₄ reaction layer that significantly suppresses the diffusion of fission product tellurium along grain boundaries, thereby preventing cracking between the alloy grains.