Abstract
An Al2O3–TiO2 amorphous composite coating with a thickness of 100–120 μm was fabricated on China low activation martensitic steel (CLAM steel) by oxygen acetylene flame spraying technology and the laser in-situ reaction method. We investigated the microstructures and mechanical properties of the coating after liquid lead-bismuth eutectic (LBE) alloy corrosion under different temperatures for 300 h and found that the corrosion temperature of the LBE had no observable effect on the microstructure and chemical phase of the Al2O3–TiO2 amorphous composite coatings. However, the mechanical properties (micro-hardness and shear strength) of the Al2O3–TiO2 multiphase coating deteriorated slightly with the increase in the immersion temperature of the LBE. As a result of oxygen acetylene flame spraying and laser in-situ reaction technology, it was found that the Al2O3–TiO2 amorphous composite coating exhibits an excellent LBE corrosion resistance, which is a candidate structural material for the accelerator-driven subcritical system (ADS) to handle nuclear waste under extreme conditions.
Highlights
The lead-bismuth eutectic (LBE) alloy is the preferred material for reactors and spallation targets of an accelerator-driven subcritical system (ADS) to deal with waste that has a long-term and high-level radioactivity, because of the advantages of high neutron flux density, the strongest irradiation resistance, excellent heat conductivity, and inferior chemical activity [1,2,3,4].China low activation martensitic (CLAM) steel has been considered a candidate for structural materials in future fusion reactor applications because of its excellent swelling resistance [5,6,7]
Pattern is identified as amorphous rings (Figure 3f). These suggest that the crystalline and amorphous multiphase ceramic coatings were successfully fabricated by laser in-situ reaction technology
We can infer that the layers covered on the CLAM steel are the oxide layers produced by corrosion; in addition, Pb and Bi elements have been diffused through the oxide layer to the interior of the CLAM steel samples, and the diffusion depth reached 10 μm at 723 K (Table 1) and 15 μm at 823 K (Table 2)
Summary
The lead-bismuth eutectic (LBE) alloy is the preferred material for reactors and spallation targets of an accelerator-driven subcritical system (ADS) to deal with waste that has a long-term and high-level radioactivity, because of the advantages of high neutron flux density, the strongest irradiation resistance, excellent heat conductivity, and inferior chemical activity [1,2,3,4]. REVIEW aiming to obtain a functional coating layer with a crystalline and amorphous multiphase that can fabricated via thermalthe spraying haveresistance the disadvantages of low density, micro-holes, cracks, oxidation dramatically improve corrosion and mechanical property of the CLAM steel surfaces. A new experimental facility (Figure 1) was adopted to measure the bonding surface via oxygen acetylene flame spraying technology, and adopted the laser in-situ reaction strength of the specimen’s interface between the coating and substrate. The Vickers hardness of the compound technology to remelt the prefabricated coating, where a composite ceramic coating was specimens was tested under a load of 1.96 N on several regions using a microsclerometer Static lead-bismuth eutectic (LBE) corrosion apparatus system: (a) schematic diagram of LBE corrosion equipment; (b) LBE corrosion apparatus system
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