... were similar with and without impurities with the formation of thick, duplex Fe-rich scales in all cases including the observation that Fe 2 O 3 only formed with 1%O 2 . For the austenitic steels, higher mass gains were observed at all temperatures with increased formation of Fe-rich oxides when...

... surface roughness, and environmental exposure, which results in the formation of a thermally grown oxide layer (TGO) layer. Current estimates of the EBC bond strength to a substrate are made assuming that the applied force divided by pull tab area is a representative metric. Although this is an expedient...

... times for NG7 being almost a factor of two faster than those for NG6 at compressed temperatures of ( T C ) ≤ 1000 K. This is due to the low temperature chain branching reactions that occur for higher alkane oxidation kinetics in this temperature range. On the contrary, at T C > 1000 K, NG6 exhibits...

...-mail:  gilles.bourque@siemens-energy.com e-mail:  henry.curran@nuigalway.ie 13 07 2021 15 07 2021 13 10 2021 chemical kinetics gas turbines internal combustion engines oxidation natural gas ST IDT correlation Science Foundation Ireland 10.13039/501100001602 The authors...

... oxide (TGO) layer between the substrate and EBC. In advanced ceramic material systems such as coated ceramic matrix composites (CMCs), the TGO layer is the weak interface and directly influences component lifetimes. The effects of surface roughness and TGO thickness on the adhesion strength were...

... complemented by modeling using the PREMIX module of Chemkin to provide insights into and to validate combined models describing the oxidation chemistry of surrogate fuels depicting kerosene, fatty acid methyl ester biofuels, and Fischer-Tropsch derived fuels. Sensitivity analysis has identified important...

...H. M. Tawancy; Luai M. Al-Hadhrami It is known that the relative performance of thermal barrier coatings is largely dependent upon the oxidation properties of the bond coat utilized in the system. Also, the oxidation properties of diffusion-type bond coats (aluminides and their modifications...

... for primary surface recuperators, three commercially cast heats have been rolled to ∼ 100 μ m thick foil in the laboratory to evaluate performance in creep and oxidation testing. Results from initial creep testing are presented at 675 ° C and 750 ° C , showing excellent creep strength compared with other...

... oxidation behavior of these materials, particularly in the presence of water vapor. 28 06 2010 19 07 2010 15 04 2011 15 04 2011 austenitic stainless steel casting creep fracture gas turbines high-temperature effects oxidation thermal stress cracking Oak Ridge...

... of these blades. HPT blades made of the nickel-based superalloy Mar-M002 have been found to suffer from stress assisted grain boundary oxidation (SAGBO) cracking. HPT blades removed from an RB211-24C aeroderivative industrial GTE were sectioned, and the cracks and microstructure were studied using scanning...

...Girish M. Shejale Gas turbine components such as nozzle segments, buckets, transition pieces, and combustion liners experience damages such as creep, fatigue, high temperature oxidation, and corrosion. The reliability, availability, and efficiency of high temperature gas turbine parts are based...

... International, Inc.). When exposed to the harsh operating environment of the microturbine PSR, HR-120 forms a protective oxide scale that is resistant to the effects of the water vapor present in the exhaust gas. Long-term accelerated microturbine testing with samples in a modified PSR with a removable aft dome...

...–Bi. For an oxygen concentration lower than the one necessary for magnetite formation (approximately < 10 − 8 wt % at T ≈ 500 ° C for Fe-9Cr steels), corrosion proceeds by dissolution of the steel. For a higher oxygen content dissolved in Pb–Bi, corrosion proceeds by oxidation of the steel...

... an exhaust of CO. This CO is mixed with steam and converted to H 2 and CO 2 using the water-gas shift reaction (WGSR). Chemical looping uses two reactions with a recirculating oxygen carrier to oxidize hydrocarbons. The resulting oxidation and reduction stages are preformed in separate reactors—the oxidizer...

... was aimed to develop a kinetic model, which can be used for the prediction of lubricant oxidative degradation correlated with endurance test conducted on engines. Knowing that base oils are a complex blend of paraffins and naphthenes with a wide range of sizes and structures, their chemistry analysis during...

...H. M. Tawancy; Luai M. Al-Hadhrami Current technology of thermal barrier coating systems used in gas turbine blade applications relies on the use of a metallic bond coat, which has a twofold function: (i) it develops a thin layer of aluminum oxide enhancing the adhesion of the ceramic top coat...

... ( ∼ 1200 ° F ) . Numerous studies have shown that the presence of water vapor greatly accelerates the oxidation rate of type 347 stainless steel at temperatures above 650 ° C ( ∼ 1200 ° F ) . Water vapor is present as a product of combustion in the microturbine exhaust, making it necessary to find...

...Celine Cabet; Fabien Rouillard Cooling helium of high temperature reactors (HTRs) is expected to contain a low level of impurities: oxidizing gases and carbon-bearing species. Reference structural materials for pipes and heat exchangers are chromia former nickel base alloys, typically alloys 617...

... improvement of the safety of graphite moderator reactors. In this study, the oxidation-induced density changes in nuclear graphite for very high temperature reactor were determined by a conventional destructive bulk density measurement method (BM) and by a new nondestructive method based on acoustic...

...). This approach minimizes the guessed parameters to only one, the exchange current density ( i 0 ) . U 3 + and Zr 4 + were the only species used for the current study. The result reveals that most of the total cell current is used for the oxidation of uranium, with little being used by zirconium...