鎳基超合金Inconel 740H為先進超超臨界(A-USC)燃煤發電系統的候選結構材料。本研究利用熱重分析儀(TGA)對純鎳、Ni-20Cr與Inconel 740H進行750、800、850和900 °C下24小時的增重行為分析，探討該溫度下的短期之氧化動力學，而三樣材料之增重結果皆符合前期線性速率、中後期拋物線速率的combine kinetics，其增重速率由快至慢依序為純鎳、Inconel 740H與Ni-20Cr。此外，利用X光繞射分析儀(XRD)、帶有能量色散X射線分析儀(EDS)的高解析度場發射式電子顯微鏡(HRFEG-SEM)、聚焦離子束顯微系統(FIB-SEM)與歐傑暨化學分析電子掃描微探儀(AES/XPS)對其氧化層進行表面微結構與橫截面微結構觀察、結構判定與成份分析後，得知純鎳在此實驗條件下，氧化層為單一多孔結構，其組成相為Cubic-NiO。Ni-20Cr則為緻密的單一相氧化層，結構為Rhombohedral-Cr2O3。Inconel 740H具有多層結構，外氧化層由rutile-TiO2、spinel-MnCr2O4與rhombohedral-Cr2O3組成，內氧化區域則包括了α-Al2O3與rutile-TiO2之析出物。此外，本研究亦利用上掀式管狀爐通入水氣氛圍在750與900°C下進行24小時之高溫實驗，實驗結果顯示水氣對於純鎳的氧化速率並無太大影響，而Ni-20Cr會因水氣的加入導致氧化層的揮發，並由原本的增重行為轉變成質量損失。Inconel 740H在750°C時有無水氣對於氧化速率的影響並不大，但在900°C時，氧化速率則因水氣的加入而提高。希望本研究能對於了解Inconel 740H在乾、濕空氣氛圍中的前期氧化機制與行為有所幫助，並期望提供Inconel 740H在將來應用或改良上的關鍵參數。

Nickel-based superalloy Inconel 740H is a candidate structural material for advanced ultra-supercritical (A-USC)coal-fired power generation systems. To explore the short-term oxidation kinetics, the thermogravimetric analyzer (TGA) was used to analyze the mass gain behavior of pure nickel, Ni-20Cr and Inconel 740H at 750, 800, 850 and 900°C for 24 hours in this study. The mass gain results of these three materials all follow the combine kinetics, corresponding with linear rate law at early stage and with parabolic rate law at mid and later stage. The mass gain rate from fast to slow are pure nickel, Inconel 740H and Ni-20Cr, respectively. Using X-Ray diffraction analysis (XRD), high-resolution field emission gun scanning electron microscope (HRFEG-SEM) with energy-dispersive X-ray spectroscopy (EDS) and focused ion beam scanning electron microscopy (FIB-SEM), the surface and cross-sectional morphology were observed using HRFEG-SEM and FIB-SEM, and structure determination and composition analysis of the oxide layer were finished using XRD, EDS system and Auger electron spectroscopy scanning microprobe. It is known that the oxide of pure nickel is a porous single structure, which is with the phase of cubic-NiO. Besides, it’s shown that the oxidation behavior of pure nickel is dominated by the outward diffusion of internal cations via the platinum marker experiment. The oxide layer of Ni-20Cr is a dense single-phase oxide with a structure of rhombohedral-Cr2O3. Inconel 740H has a multi-layer structure at the same experiment condition. The external oxide layer is composed of rutile-TiO2, spinel-MnCr2O4 and rhombohedral- Cr2O3.At the same time, the internal oxide region includes the precipitates of α-Al2O3 and rutile-TiO2. Furthermore, a tube furnace was used to carry high-temperature experiment at 750 and 900 °C for 24 hours with humid air atmosphere. The volatilization of the oxide layer would be caused by the addition of water vapor, and the original mass gain behavior was transformed into a mass loss behavior. The oxidation rate of Inconel 740H shows little difference between being set in the dry air or moisture air atmosphere. However, at 900°C, the oxidation rate increases due to the addition of water vapor. Hope this study will be helpful for understanding the early oxidation mechanism and behavior of Inconel 740H in dry and wet air atmosphere. It is expected that it can provide important parameters for the future application or improvement of Inconel 740H.

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