Microwave Derived Bi-modular Composite Coatings For Encountering Erosion-Related Problems

Degradation of fluid machinery components due to slurry (SE) and cavitation (CE) erosion and corrosion is a severe problem for agriculture and utility pumps, hydroturbines, ship propellers, valves, and pipelines. The degradation arising from CE is inevitable due to fluctuating pressure head and speed. A high silt content in rivers and entrained sand/abrasive particles in pumped water causes severe SE. The interaction with corrosion further aggravates the degradation process.Degradation of fluid machinery components due to slurry and cavitation erosion and corrosion is a severe problem for agriculture and utility pumps, hydroturbines, ship propellers, valves, and pipelines. The degradation arising from CE is inevitable due to fluctuating pressure head and speed. A high silt content in rivers and entrained sand/abrasive particles in pumped water causes severe SE. The interaction with corrosion further aggravates the degradation process.

Coatings are economical alternative for improving the tribological properties of materials. The coatings developed using microwave (MW) technique helps mitigate the limitations (anisotropic microstructure, high porosity content, cracks and voids) usually observed in coating developed using conventional techniques such as physical (PVD) and chemical deposition techniques (CVD), thermal spraying, laser , and weld-overlay.

We plan to design and develop bi-modular composite coatings using microwave technique for improving the SE and CE resistance of the fluid machines. Use of microwave technique ensures microstructural homogeneity with elimination of pores and crack due to hybrid heating (volumetric and conductive) of the feedstock powder. The elimination of splat boundaries and preferential grain growth directions imparts the required isotropic characteristic to the coating. The aim will be to design coatings possessing high hardness and fracture toughness that can directly help improve the erosion resistance. A fundamental understanding to delineate why and to what-extent the bi-modular design can improve the performance of the coatings would be explored.  Relationship between the coating microstructure and the underlying erosion mechanisms would also be developed.

Faculty

Assistant Professor

Students

Abhishek Babu
Junior Research Fellow (JRF)
Class of: 
2017