Non-erosion coating prodn. on turbine blade, for light wt. and efficiency - by forging blank contg. aluminium@ alloy surrounded by steel layer, extruding to form stock, and applying protective layer to blade, or high turbine speeds

摘要

The prodn. comprises forging a blank comprising an Al alloy surrounded by a steel layer. The blank is extruded to form the stock for forging. An erosion protection layer may be applied to the blade. The Al alloy is pref. alloy 2124, with addn. of pref. 20 vol.% SiC, or alloy 6061, with addn. of pref. 10 vol.% Al2O3. ADVANTAGE - Higher turbine speeds and efficiency are obtd..