Wear Prediction via Accelerated Test on Chromium Based Hard Coatings for Gas Turbine Interfaces Applications Up to 370 °C

[摘要] Chromium (Cr) based hard coatings offer excellent wear resistance and thermal conductivity properties. Applying additives, such as carbon (C) and cobalt (Co) may improve hardness thus delay wear. Therefore, Cr-C and Cr-Co based coating systems were selected to investigate their potential on the mating surfaces of Ni-based superalloy combustor liners of commercial gas turbines. One surface contact on the commercial combustor liner was selected, in which was exposed to temperatures of 370 °C during its operation. In this study, the selected hard coatings were deposited onto nickel-based substrates via air plasma. An accelerated wear test was conducted at two different operating temperatures; at 100 °C and 200 °C to predict the wear characteristics at elevated temperatures for longer operation, from 8,000 Operating Hours (OH) to 12,000 OH. Both coatings exhibited a decreased hardness with increasing temperatures. It was found that high severity in volume loss suffered by Cr-Co coatings. In summary, it was quantitatively predicted that Cr-C coated Ni alloy was found to be much better than the Cr-Co based coating to delay the wear in gas turbines thus prolong the operation from 8,000 to 12,000 OH at 370 °C.

[发布机构] TNB Research Sdn Bhd, Selangor, Malaysia^1

[效力级别] 工业技术 [学科分类] 工业工程学

[关键词] Accelerated tests;Combustor liners;Conductivity properties;Elevated temperature;Increasing temperatures;Ni-based superalloys;Operating temperature;Wear characteristics