Abstract
Solid particle erosion is an important material degradation mechanism occurs in thermal power plants, aircraft gas turbine engines. When gas turbine components like compressors, blades and vanes working under high temperature, Erosion wear occurs by impact of solid particles like coal ash and unburnt carbon particles. In this present research work the solid particle erosion studied on uncoated samples (Ti-31), and HVOF sprayed 25% (Cr3C2-25 (Ni20Cr)) + 75% NiCrAlY powder on Ti-31. Erosion studies are done with impact angles of 30°, 60° and 90°. Solid particle erosion studies were carried out using air jet erosion test rig as per ASTM G76-02 standard. All the three angles of uncoated alloys exhibit erosion damage under ductile mode and less amount of erosive loss compared HVOF coated samples. The HVOF sprayed coated Ti-31 at various impact angles is brittle mode. The mechanism of material removal during erosion of brittle materials is explained by using SEM micrographs. Erosion is controlled by using selected coating powder.
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