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Process to protect a single crystal superalloy piece from nickel free of hafnium
Process to protect a single crystal superalloy piece from nickel free of hafnium
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机译：保护单晶超合金零件免受不含nickel的镍的过程
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摘要
The present invention refers to a process to protect a single crystal superalloy piece from hafnium -free nickel (1),Against corrosion and oxidation, comprising at least the following steps, consisting of: manufacture a single crystal -free nickel -based single crystal superalloy (1),-deposit in the part (1),A first layer (2) comprising hafnium, then a base coating layer of an alloy comprising at least 10%in atomic aluminium ratio and a second layer comprising hafnium, simultaneously or alternately, in order to form a mixed layer (3) and finally a third layer The layer comprising hafnium (4),-diffuse the first layer comprising hafnium (2),To form a first prohibitive zone (21) at the top of the single crystal superalloy piece at the hafnium -free nickel base (1) and spread the third layer (4) comprising hafnium, in order to form a second interdiction zone (41) on the mixed layer surface (41) 3),-after diffusion treatment, carry out an oxidation treatment of the second interdiction zone (41),In order to obtain an alumina layer doped with hafnium (42) on the surface of the second interdiction zone (41).
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