Using vitreous enamelling and atmospheric plasma spraying (APS) processes, a new thermal barrier coating (TBC) system with an 8-YSZ top coat, glass-ceramic bond coat, and nimonic supper alloy substrate was created. The APS process was used to create a conventional TBC system consisting of an 8-YSZ top coat, a NiCoCrAlY bond coat, and a nimonic supper alloy substrate. The purpose of this research was to evaluate the thermal cycle performance of glass-ceramic bonded TBC systems to traditional TBC systems. X-ray diffraction analysis for phase identification, scanning electron microscopy for microstructural inspection, energy dispersive X-ray analysis for elemental composition determination, and a Vickers hardness tester for hardness evaluation were used to evaluate both TBC systems. Both TBC systems were also subjected to heat cycling testing at 1000oC for 250 hours using both air and water quenching methods. When comparing the glass-ceramic bond coated TBC system to the standard TBC system, a more gradual transition in microhardness values was discovered, indicating that the new TBC system will provide more reliable performance. Thermal cycling at 1000oC revealed that both TBC systems were stable under air quenching testing for 250 cycles, however coating spallation was seen in water quenching tests for 150 cycles for both TBC systems. Furthermore, the old TBC system showed considerable oxidative weight gain, whereas the new TBC system did not.
Author(S) Details
Poulomi Mukherjee
Bio-ceramics and Coating Division, CSIR-Central Glass and Ceramic Research Institute (CSIR-CGCRI), Kolkata-700 032, India.
Pallabi Roy
Bio-ceramics and Coating Division, CSIR-Central Glass and Ceramic Research Institute (CSIR-CGCRI), Kolkata-700 032, India and Academy of Scientific and Innovative Research (AcSIR), CSIR-Human Resource Development Centre, (CSIR-HRDC) Campus, Postal Staff College Area, Sector 19, Kamla Nehru Nagar, Ghaziabad, Uttar Pradesh- 201 002, India.
Sumana Ghosh
Bio-ceramics and Coating Division, CSIR-Central Glass and Ceramic Research Institute (CSIR-CGCRI), Kolkata-700 032, India.
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