(華東理工大學(xué) 機(jī)械與動力工程學(xué)院 化學(xué)工程聯(lián)合國家重點(diǎn)實(shí)驗(yàn)室，上海 200237)
摘 要: 采用原位氧化法于H2和水蒸汽形成的低氧分壓環(huán)境中，在HP40合金表面制備復(fù)合氧化膜。用XRD、EDS和SEM分別表征合金表面氧化膜的物相、成分、形貌，以及在氧化層截面上各組元的線和面分布狀態(tài)。結(jié)果表明，隨著制備溫度的升高，合金表面MnCr2O4尖晶石逐漸增加，其形貌由針狀逐漸變?yōu)轭w粒狀，顆粒尺寸小于1 μm；氧化膜的總厚度為7 μm，由外向內(nèi)分別為MnCr2O4尖晶石、Cr2O3和SiO2 3層。
關(guān)鍵字: HP40合金；原位氧化法；低氧分壓
（State Key Laboratory of Chemical Engineering, School of Mechanical and Power Engineering,
East China University of Science and Technology, Shanghai 200237, China）
Abstract:Compound oxide scales were in-situ prepared on the surface of HP40 alloy in the H2/steam atmosphere with low oxygen partial pressure at 900?1 200 ℃. Then, the oxide scales on HP40 alloy were characterized by SEM, EDS and XRD. The results show that the quantity of MnCr2O4 spinel of the scale increases with the heat treating temperature increasing, while the morphologies of the scale change from acicular to granulate. The size of spinel granules on the surface is smaller than 1 μm. The total thickness of the formed oxide scales is about 7 μm, which can be characterized as three layers, i.e., the outer MnCr2O4 spinel layer, the middle Cr2O3 rich layer, and the most inner SiO2 layer, respectively.
Key words: HP40 alloy; in-situ oxidation; low oxygen pressure
