Erosion Behavior of Cold Sprayed Ni based Coating on Boiler Steel

2,3,45B.E. Students, Dept. of Mechanical Engineering, Sambhram Institute of Technology, Bangalore Visvesvaraya Technological University, Belagavi 1Assistant Professor, Dept. of Mechanical Engineering, Sambhram Institute of Technology, Bangalore ---------------------------------------------------------------------***---------------------------------------------------------------------Abstract Erosion is a severe and most common problem in boiler tubes of power plant boiler, aircraft engine, and steam and jet turbines. Erosion wear causes the loss of material from the component gradually, reduces the performance and thus, finally leads to failure of component. Coating of the boiler steel (substrate) is one of the effective methods to reduce the erosion wear. The paper aims to use high pressure cold spray technology to coat the boiler steel. Cold spray is a promising technology for depositing protective coatings. In this current research work of boiler steel, two coating powders 70Ni-30Cr & 50Ni-50Cr was coated over GrA1 boiler steel substrate by cold spray coating technology. The boiler steel, both coated and uncoated was subjected to jet erosion test at high temperature at an impact angle of 30° & 90° along with SEM, EDS and XRD characterization. Erosion rate is observed more for impact angle of 30° than 90°. It is observed that the coated specimen showed better wear resistance than uncoated ones.