Research Projects

The proposed project explores the use of novel functionally graded materials in nuclear reactors, specifically WC-Cr₃C₂-Ni functionally graded composite coatings on superalloy C-263. This material is highly challenging due to the lack of research on high-temperature applications of Ni-based alloys, particularly nickel substrate coatings and weld compatibility studies in the nuclear industry. The study aims to improve the adhesion strength of the coating to the substrate surface using functionally graded composite coating methodologies. This approach may reduce the intensity of failure due to the thermal expansion coefficient difference between the substrate and coating. The rise in operating temperature range in fourth-generation reactors necessitates the development of materials that can withstand high-temperature wear, corrosion, and oxidation. Nickel-based superalloys are a leading contender for high-temperature nuclear reactors, but there is limited literature on high-temperature applications of Ni-based alloy coatings. Mixed carbide-based coatings, such as WCCr₃C₂, offer superior wear resistance even at high temperatures and improved corrosion and oxidation resistance due to the presence of Cr₃C₂. This research also concerns the safety of nuclear waste in corrosive environments over centuries.