EFFECT NUMBER OF NOZZLES GROOVE HVOF THERMAL SPRAY AND EROSION ANGLE ON WEAR RESISTANCE OF CR3C2-20NICR COATINGS

• Main Author: Agsan Masera, Tafryan
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/39492
• Institution: Institut Teknologi Bandung

AISI 316L stainless steel is widely applied in various ways of the industrial sector, such as heat exchangers, boilers, turbines, furnaces and automotive exhaust systems, because the AISI 316L stainless steel has excellent ductility, formability, toughness and corrosion resistance, and can be operated at high temperature working environments up to 800oC. AISI 316L stainless steel is quite susceptible to erosion on its surface due to erosion by hard foreign particles. AISI 316L stainless steel surface needs to be coated by other materials that have high hardness and wear resistance, such as Cr3C2-20NiCr. High Velocity Oxygen Fuel (HVOF) is one of the coating method for AISI 316L stainless steel surface. This research will study high temperature erosion resistance of AISI 316L stainless steel which has been coated by Cr3C2-20NiCr powder. Cr3C2 was chosen as a matrix because it has a high hardness and excellent abrasion and erosion resistances. The addition of NiCr is intended as a binder and to improve coating toughness. The number of the nozzle grooves used in the HVOF process consist of three types, namely no groove, 2 grooves and 4 grooves. The results showed that the HVOF Cr3C2-20NiCr coating using the 4 grooves nozzle had the best coating compared to no groove and 2 grooves nozzle, where 4 grooves nozzle erosion value was the lowest for each erosion angle of 30o, 60o and 90o, with erosion value of 0.0085; 0.033 and 0.067 mm3.g-1, respectively.