摘要:
A fabrication method of fabricating a thermal barrier covering a superalloy metal substrate, the thermal barrier including at least an underlayer and a ceramic layer, the method including: smoothing a surface state of the underlayer by at least one physicochemical and/or mechanical process prior to depositing the ceramic layer such that a number of defects presenting a peak-to-peak difference lower than or equal to 2 μm is at most five over any distance of 50 μm, and then depositing the ceramic layer. The method can be applied to turbine blades.
摘要:
The present invention relates to a method for forming a protective coating containing aluminium and zirconium on the surface of a metal part, wherein said part is put into contact with a cement made of aluminium alloy, at a treatment temperature, with an atmosphere containing an active gas which reacts with the cement to form a gaseous aluminium halide, which decomposes in contact with the part depositing metallic aluminium thereon, the active gas containing ZrOCl2 that decomposes in contact with the part depositing Zr metal thereon, and being formed by vaporizing granules of ZrOCl2 that are solid at ambient temperature. The method is characterized in that the part, the cement and ZrOCl2 granules are progressively heated together in a chamber from ambient temperature to the treatment temperature with a plateau at 400° C.±200° C.
摘要:
A method for forming a protective coating containing aluminum and zirconium on the surface of a metal part. The part is put into contact with a cement made of aluminum alloy, at a treatment temperature, with an atmosphere containing an active gas which reacts with the cement to form a gaseous aluminum halide, which decomposes in contact with the part depositing metallic aluminum thereon, the active gas containing ZrOCl2 that decomposes in contact with the part depositing Zr metal thereon, and being formed by vaporizing granules of ZrOCl2 that are solid at ambient temperature. The part, the cement, and ZrOCl2 granules are then progressively heated together in a chamber from ambient temperature to the treatment temperature with a plateau at 400° C.±200° C.