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- W96372178 abstract "A powder cladding process with a CO2-laser was successfully carried out to produce coatings of 7% yttria-stabilized zirconia on Ti6Al4V, alloy 625, alloy 718 and stainless steel 304 by overlapping tracks. Also, mixtures of 15% molybdenum and 15% titanium within the 7% Y2O3-stabilized zirconia were applied in the same way. Due to the high absorptance of the ceramic at the CO2-wavelength, a small track overlap of about 20 to 25% of the track width is necessary in order to avoid spalling of the previous track and to minimize the surface amplitude. The addition of 15% Mo decreased the absorptance of the powder/melt significantly and attenuated the track width by about 20%. Cladding of the [ZrO2-7% Y2O3]15Ti cermet on alloy 625 did not succeed. The obtained coatings are 0.6 to 1.1 mm thick and are properly bonded to the base metal. Micrographs indicate a dendritic solidification structure and a low pore formation of coatings on Ti6Al4V. Coatings on Ni-base alloys, however, exhibit a columnar structure and a low pore formation as well. The molybdenum was not dissolved by the ZrO2-Y2O3-Ti melt and formed spheres of different sizes within the ceramic layer. The crack morphology depends upon the powder composition and the process parameters, mainly the traverse speed. ZrO2-7% Y2O3 coatings on Ti6Al4V are regularly segmented by cracks running perpendicular to the surface plane and ending at the coating/metal interface. Although the [ZrO2-7%Y2O3]Mo coatings on Ti6Al4V exhibit almost identical surface crack patterns as coatings without molybdenum, they are distinguished by substantially more cracks running in all directions, as seen in micrographs. ZrO2-7% Y2O3 coatings on Ni-alloys 625 and 718 and steel 304 are also marked by regular surface crack patterns. Compared with coatings on Ti6Al4V the number of cracks was higher and only little dependence of crack formation on traverse speed was observed. At all parameter settings short cracks perpendicular to the cladding direction occured. Judging from our encouraging results laser powder cladding may, for some applications, eventually become a process, which is economically and technologically superior to plasma spraying.A powder cladding process with a CO2-laser was successfully carried out to produce coatings of 7% yttria-stabilized zirconia on Ti6Al4V, alloy 625, alloy 718 and stainless steel 304 by overlapping tracks. Also, mixtures of 15% molybdenum and 15% titanium within the 7% Y2O3-stabilized zirconia were applied in the same way. Due to the high absorptance of the ceramic at the CO2-wavelength, a small track overlap of about 20 to 25% of the track width is necessary in order to avoid spalling of the previous track and to minimize the surface amplitude. The addition of 15% Mo decreased the absorptance of the powder/melt significantly and attenuated the track width by about 20%. Cladding of the [ZrO2-7% Y2O3]15Ti cermet on alloy 625 did not succeed. The obtained coatings are 0.6 to 1.1 mm thick and are properly bonded to the base metal. Micrographs indicate a dendritic solidification structure and a low pore formation of coatings on Ti6Al4V. Coatings on Ni-base alloys, however, exhibit a columnar structure and a lo..." @default.
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- W96372178 date "1994-01-01" @default.
- W96372178 modified "2023-09-26" @default.
- W96372178 title "Laser cladding of partially yttria stabilized zirconia on titanium, nickel and steel alloys" @default.
- W96372178 doi "https://doi.org/10.2351/1.5058780" @default.
- W96372178 hasPublicationYear "1994" @default.
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