PRODUCTION OF Co–Cr–Al–Y–Si POWDER ALLOY

Abstract

A more effective process of producing the Co–Cr–Al–Y–Si powder with 40–100 mm particles is developed. This process yields 70% of this powder fraction while other existing processes provide 50–60%. The proposed process involves melting of ingots for an electron-beam unit and their subsequent fragmentation using a press and strip rolling mill. It is shown that energy consumption during this mechanical grinding is smaller compared to the use of crushers and grinding mills and almost 20 times lower than compared to atomization. The developed process is waste-free: powder fraction is less than 40 µm in the melting of ingots. The method of producing the Co–Cr–Al–Y–Si powder is patented. The powder is used as a heat-resistant sublayer of thermal protection coatings for blades for gas turbine engines.