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With the increasing demand for economic efficiency in power plants, modern advanced reactors are developing towards large fuel loads, high burnup, and long cycles. This increase in initial fuel load significantly increases the initial residual reactivity of the reactor core within the active zone. In actual operation, separate burnable poison fuel assemblies alone are insufficient to maintain the required long-term reactor reactivity. However, integrated burnable poison fuel assemblies can improve the power distribution within the reactor core, thereby extending refueling cycles and improving fuel economy.

Yttrium Oxide (Y2O3) transparent ceramics have the characteristics of high melting point (2430 ℃), wide optical transparency range (200~8000 nm), excellent corrosion resistance and thermal stability, especially the low infrared emissivity and absorption coefficient exhibited in high temperature environment, which makes it stand out among many transparent ceramic materials and shows broad application prospects in many scenarios such as lasers, transparent windows and semiconductor devices.

Yttria coatings, as a key component of Rare Earth oxide coatings, offer wear resistance, high-temperature stability, and corrosion resistance, playing a vital role in key sectors such as aerospace, electronic communications, and the atomic energy industry. However, given the diverse service environments of engineering materials, traditional Y2O3 thermal barrier coatings are no longer able to meet these complex service requirements. These coatings exhibit poor coating stability, large failure areas, and significantly reduced service life, severely limiting their further adoption in engineering applications.

Aluminum and aluminum alloys have a series of advantages such as light weight, high strength, corrosion resistance and recyclability. They are widely used in building materials, decoration, aerospace, automation industry, etc. A large number of aluminum products can be recycled after reaching the end of their service life. Due to the mixture of various grades of aluminum alloys, scrap aluminum contains various impurities and pores. After remelting, the comprehensive mechanical properties of the recycled aluminum alloy are seriously affected and cannot reach the mechanical standards of original aluminum. Therefore, how to regenerate scrap aluminum and make its performance close to or reach that of original aluminum is currently a topic that needs to be studied urgently.

The atomic radius of rare earth is generally between 0.1821 and 0.2042 nm, while the atomic radius of iron is 0.1241 nm. The difference between the two is large, so the solid solubility of rare earth in steel is generally very low. A large number of studies have shown that the addition of trace rare earth elements can significantly improve the plasticity, toughness, wear resistance, heat resistance, corrosion resistance and many other properties of steel.

Molten salt electrolysis is the main method for large-scale preparation of rare earth metals and their alloys, and it has the lowest cost, highest efficiency, and mature industrial application. Molten salt electrolyte is the main carrier in the electrolysis process, and the physical and chemical properties of the electrolyte are important factors affecting the quality of rare earth metals and the stability of the electrolysis process.

Gas turbines and aircraft engines are important power equipment. In order to improve output power and operating efficiency, gas turbines have been developing towards increasing turbine inlet temperature in recent years. At present, the turbine inlet temperature of ground-based gas turbines is above 1400℃, and the gas temperature of advanced military gas turbines is even 1500-1800℃. Such high temperatures make the operating environment of the hot end components of the gas turbine very harsh, and they need to withstand high-temperature oxidation, corrosion, airflow scouring, high-temperature creep and thermomechanical fatigue.