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TBC
Hello to everybody,
I have a problem.
I deposited on nemonic 60 support Amdry 997 by HVAF thickness 0,1 mm and ZrO2/Y2O3 (92/8) by APS with F4 gun, thickness 0,25 mm.
I have tested the samples in an electric furnace at 1200ºC for 24 hours, followed by cooling at 25ºC in 50 min.
After 3 cycles there appeared spalling between bond coat and top coat.
Does anybody know if there is a treatment necessary before testing the samples ?
Can anybody indicate me the deposition parameters for Metco 222A with F4 gun ?
(06-02-2015, 06:12 PM)plasmajet1990 Wrote: Hello to everybody,
I have a problem.
I deposited on nemonic 60 support Amdry 997 by HVAF thickness 0,1 mm and ZrO2/Y2O3 (92/8) by APS with F4 gun, thickness 0,25 mm.
I have tested the samples in an electric furnace at 1200ºC for 24 hours, followed by cooling at 25ºC in 50 min.
After 3 cycles there appeared spalling between bond coat and top coat.
Does anybody know if there is a treatment necessary before testing the samples ?
Can anybody indicate me the deposition parameters for Metco 222A with F4 gun ?
Thanks !
Ion
Hi plasmajet1990,
Maximum permissible application temperature for Amry 997 (NiCoCrAl [Ta, Hf, Si] Y) is 1050°C (long term < 1000°C). It's no wonder that bondcoat was so heavily oxidized after 24 hours at 1200°C, that topcoat flaked off.
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RE: TBC
(06-03-2015, 05:57 AM)Vadim Verlotski Wrote:
(06-02-2015, 06:12 PM)plasmajet1990 Wrote: Hello to everybody,
I have a problem.
I deposited on nemonic 60 support Amdry 997 by HVAF thickness 0,1 mm and ZrO2/Y2O3 (92/8) by APS with F4 gun, thickness 0,25 mm.
I have tested the samples in an electric furnace at 1200ºC for 24 hours, followed by cooling at 25ºC in 50 min.
After 3 cycles there appeared spalling between bond coat and top coat.
Does anybody know if there is a treatment necessary before testing the samples ?
Can anybody indicate me the deposition parameters for Metco 222A with F4 gun ?
Thanks !
Ion
Hi plasmajet1990,
Maximum permissible application temperature for Amry 997 (NiCoCrAl [Ta, Hf, Si] Y) is 1050°C (long term < 1000°C). It's no wonder that bondcoat was so heavily oxidized after 24 hours at 1200°C, that topcoat flaked off.
It has to resist 1200°C at YSZ-surface, but on interface bond coat - top coat the temperature should not exceed 950°C. To create these conditions (temperature gradient 200-250°C) is necessary to heating the sample by the coated surface and cooling by the substrate.
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RE: TBC
(06-04-2015, 08:04 AM)Vadim Verlotski Wrote: Yes, I know, but it has to resist
Thanks!
It has to resist 1200°C at YSZ-surface, but on interface bond coat - top coat the temperature should not exceed 950°C. To create these conditions (temperature gradient 200-250°C) is necessary to heating the sample by the coated surface and cooling by the substrate.
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