Single phase platinum aluminide bond coat
a technology of platinum aluminide and bonding layer, which is applied in the direction of surface reaction electrolytic coating, chemical vapor deposition coating, solid-state diffusion coating, etc., can solve the problems that the performance of a different thermal barrier system may not achieve the same beneficial results using these parameters, and may well be ineffective, so as to improve the life of the
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example 1
[0029] René N5 substrates were coated with a single phase PtAl bond coat and grit blasted with #60 alumina grit at 80 psi to achieve an average surface roughness of about 50 Ra. The substrates were then heat treated at an oxygen partial pressures of 10−6 mbar, 10−5 mbar, 10−4 mbar and 1000 Mbars at about 2050° F. for about 2-4 hours. Following the partial pressure oxidation, the samples were provided with a standard 7-YSZ ceramic topcoat with an electron beam physical vapor deposition (EBPVD) process. The samples were given a one hour FCT cycle test at about 2125° F. The results are provided in FIG. 2. The baseline for samples having a single phase bond coat, being grit blasted but not having a partial pressure heat treatment, is 230 cycles. The partial pressure preoxidation improves the fatigue cycle life over the baseline sample.
example 2
[0030] René N5 substrates were coated with a single phase PtAl bond coat and divided into two groups. The surface of the first group was grit blasted with #60 alumina grit at a pressure of 80 psi. The second group was acid etched in a solution of hydrochloric acid (HCl) and nitric acid (HNO3) for a time of about ten (10) seconds at room temperature. The cleanliness of the surfaces of the substrates after surface treatment of each procedure was verified by Auger surface analysis. Both groups of samples were then preoxidized at oxygen partial pressures of 10−4 mbar and 10−5 mbar at temperatures of about 2050° F. The samples were then coated with a standard 7-YSZ ceramic topcoat in the manner set forth in Example 1 and tested in accordance with the testing performed in Example 1. The acid treated group performed in accordance with the baseline samples that were single phase bond coated, being grit blasted but not having a partial pressure heat treatment. The FCT life of the acid treate...
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