A high thrust-to-weight ratio poses challenges to the high-temperature performance of Ni-based superalloys. The oxidation behavior of GH4738 at extreme temperatures has been investigated by isothermal and non-isotherm...A high thrust-to-weight ratio poses challenges to the high-temperature performance of Ni-based superalloys. The oxidation behavior of GH4738 at extreme temperatures has been investigated by isothermal and non-isothermal experiments. As a result of the competitive diffusion of alloying elements, the oxide scale included an outermost porous oxide layer (OOL), an inner relatively dense oxide layer (IOL), and an internal oxide zone (IOZ), depending on the temperature and time. A high temperature led to the formation of large voids at the IOL/IOZ interface. At 1200℃, the continuity of the Cr-rich oxide layer in the IOL was destroyed, and thus, spallation occurred. Extension of oxidation time contributed to the size of Al-rich oxide particles with the increase in the IOZ. Based on this finding,the oxidation kinetics of GH4738 was discussed, and the corresponding oxidation behavior at 900-1100℃ was predicted.展开更多
The use of renewable energy for hydrogen production through water electrolysis is a critical pathway for green hydrogen generation.Compared to pure water electrolysis,direct electrolysis of seawater offers several adv...The use of renewable energy for hydrogen production through water electrolysis is a critical pathway for green hydrogen generation.Compared to pure water electrolysis,direct electrolysis of seawater offers several advantages,such as raw material availability and application diversity.However,the complex composition of seawater presents significant technical challenges,particularly the competitive chloride oxidation reaction(ClOR)at the anode,which leads to equipment corrosion[1].展开更多
基金financially supported by the National Key R&D Program of China (No.2021YFB3700400)the National Natural Science Foundation of China (Nos.52074030,51904021,and 52174294)。
文摘A high thrust-to-weight ratio poses challenges to the high-temperature performance of Ni-based superalloys. The oxidation behavior of GH4738 at extreme temperatures has been investigated by isothermal and non-isothermal experiments. As a result of the competitive diffusion of alloying elements, the oxide scale included an outermost porous oxide layer (OOL), an inner relatively dense oxide layer (IOL), and an internal oxide zone (IOZ), depending on the temperature and time. A high temperature led to the formation of large voids at the IOL/IOZ interface. At 1200℃, the continuity of the Cr-rich oxide layer in the IOL was destroyed, and thus, spallation occurred. Extension of oxidation time contributed to the size of Al-rich oxide particles with the increase in the IOZ. Based on this finding,the oxidation kinetics of GH4738 was discussed, and the corresponding oxidation behavior at 900-1100℃ was predicted.
基金supported by the National Natural Science Foundation of China(Grant Nos.22202205 and 22209170)XMIREM Autonomously Deployment Project,China(Nos.2023CX14,2023GG01)+4 种基金Self-deployment Project Research Program of Haixi Institutes,Chinese Academy of Sciences(Nos.CXZX-2022-GH03,CXZX-2024-JQ02)Major Science and Technology Program of Xiamen,China(No.3502Z20231054)Natural Science Foundation of Fujian Province,China(Grant Nos.2022J01502 and 2024J01185)STS Program of the Chinese Academy of Sciences,China(No.2023T3071)Natural Science Foundation of Xiamen,China(No.3502Z20227256).
文摘The use of renewable energy for hydrogen production through water electrolysis is a critical pathway for green hydrogen generation.Compared to pure water electrolysis,direct electrolysis of seawater offers several advantages,such as raw material availability and application diversity.However,the complex composition of seawater presents significant technical challenges,particularly the competitive chloride oxidation reaction(ClOR)at the anode,which leads to equipment corrosion[1].
