| Summary: | An Al<sub>2</sub>O<sub>3</sub>−TiO<sub>2</sub> 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 Al<sub>2</sub>O<sub>3</sub>−TiO<sub>2</sub> amorphous composite coatings. However, the mechanical properties (micro-hardness and shear strength) of the Al<sub>2</sub>O<sub>3</sub>−TiO<sub>2</sub> 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 Al<sub>2</sub>O<sub>3</sub>−TiO<sub>2</sub> 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.
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