The Effect of Fuel Gas Pressure on The Properties of Nickel-Chromium-Iron-Aluminum-Boron Nitride Abradable Coating

Abstract

Abradable coating of Nickel Chromium Iron Aluminium Boron Nitride Cermet Powder sprayed by flame spray process is used as clearance control coating on the aero engine components. Nimonic alloy Su-263 is used as substrate material for this coating. Ni5%Al composite powder sprayed through atmospheric plasma spray is used as bond coat. Different trials on test samples were carried out with varying pressures of fuel gas acetylene in the flame spray process. Coated samples from all the trials were analysed for hardness measurement and microstructure evaluation. It was observed that pressure of fuel gas acetylene in the flame spray process has direct influence on the hardness as well as microstructure of the coating. Appreciable change in rate of deposition of coating was also noticed due to variation in fuel gas pressure.