Preparation and properties of Ti 3SiC 2-based corrosion mitigation coatings for SiC f/SiC PWR accident tolerant fuel cladding

作者：Jinsong Yang, Fang Ye, Laifei Cheng, Kai Zhao, Yucong Wei · 发表于：Journal of Advanced Ceramics · 年份：2023 · DOI：10.26599/jac.2024.9220837 · 被引用次数：25 · 研究领域：Advanced ceramic materials synthesis、MXene and MAX Phase Materials、Advanced materials and composites

To enhance the resistance of SiCf/SiC to hydrothermal corrosion in the pressurized water reactor (PWR) environment, structurally tunable Ti3SiC2-based corrosion mitigation coatings for SiCf/SiC were prepared using molten salt synthesis. The influence of various process parameters like Si/Ti molar ratio in the raw materials, annealing time and annealing temperature, on the phase composition and the structure of coatings was explored. Through process control, the fabricated coatings can be either Ti3SiC2 monolithic structure or TiC/Ti3SiC2 and TiC/Ti3SiC2/Ti5Si3Cx multi-layered structures. The coatings demonstrate strong bonding to the substrate due to in-situ reaction, exhibiting tensile and shear strengths of at least 26.9 MPa and 30.8 MPa, respectively. Incorporating TiC as a transition layer further enhances the strengths to 41.3 MPa and 51.4 MPa, respectively. Monolithic Ti3SiC2 coatings enhance the thermal conductivity of SiCf/SiC by 10%~12%. Notably, Ti3SiC2 coatings effectively protect SiCf/SiC from hydrothermal corrosion, demonstrating an 83% strength retention rate compared to 71% in the control group after corrosion. However, the Ti5Si3Cx layer exhibits unsatisfactory corrosion mitigation. Ti3SiC2 monolithic coating has higher thermal conductivity, TiC/Ti3SiC2 multi-layered coating has higher bonding strength, and both have desirable resistance to hydrothermal corrosion.