Study on Process and Properties of Pulse Laser Prepared Cr Coating for Accident Tolerant Fuel Claddings

This paper introduces the latest ATF cladding achievements of China General Nuclear Power Corporation (CGN). The Cr coating of Zircon with different thickness was prepared under different power by pulse laser cladding technique. The results obtained so far show that Cr coating can achieve good high temperature oxidation resistance which prepared using pulse laser cladding technology under the parameters such as pulse laser power for 50~60 W, pitch for 0.8~0.9 mm and angular velocity for 10 mm. The mechanism analysis shows that the Cr coating has good compatibility with the Zirconium alloy at 1200℃, and the protective effect of Cr coating is directly controlled by the coating quality.