Vol. 2, Issue 11 (2015)
Development and slurry erosion analysis of Ni +SiC composite coating on turbine steel
Author(s): Gagandeep Singh, Pushpinder Sharma, Rohit Sharma
Abstract: Development of hard coating on the soft surfaces increases the service life of components and reduces the service and maintenance costs. Surface engineering has proved to be one of the key areas for developing materials which are highly efficient. It led to the increased service life of components. Various manufacturing and processing methods are used for development of coatings however, detonation gun spray method for development of coatings proved to be cost effective and efficient. In present work metal-ceramic composite coatings using EWAC (Nickel based) and ceramic (10%wt Silicon Carbide) powders were developed using D-Gun spray method. Characterizations were carried out in terms of microstructures, mechanical and analysis of erosion wear in terms of mass loss. Results revealed that development of coatings proved to be highly efficient and reduces the erosion wear. The developed coating showed Vickers microhardness of 492.8±25HV which was 40.8% higher than the base substrate. Results of erosion wear revealed that maximum cumulative mass loss of all the samples occurred at lower angles of impingement i.e. 30°. On increasing the impingement angles mass loss decreases and this is due to the lower cutting and shearing forces. The effect of increase in rotational speed revealed that on increasing the rotational speeds the mass loss of samples increases linearly. This is due to the increase in kinetic energy of particles which increases the impact strength of particles and enhances the erosion phenomenon.