(武漢輕工大學(xué) 機(jī)械工程學(xué)院，武漢 430023)
摘 要: 以Ni、Cr、Mo、Cu為原料，采用活化反應(yīng)燒結(jié)制備Ni-Cr-Mo-Cu多孔材料，采用靜態(tài)增重法測定其氧化動(dòng)力學(xué)性能，利用X射線衍射(XRD)、掃描電鏡(SEM)、X射線光電子能譜(XPS)、能譜儀(EDS)、孔徑測試儀等分析手段表征了Ni-Cr-Mo-Cu多孔材料在600~800 ℃的表面氧化膜組成、結(jié)構(gòu)和形貌等氧化行為。結(jié)果表明：多孔材料的氧化動(dòng)力學(xué)近似拋物線演變規(guī)律，在800 ℃氧化20 h后，最大孔徑從13.32μm下降到9.52μm，透氣率從97.8 m3/(m2·kPa·h)下降到81.3 m3/(m2·kPa·h)，多孔材料的透氣度僅下降了16.8%。重點(diǎn)探討了Ni-Cr-Mo-Cu多孔材料在高溫條件下的氧化機(jī)理，多孔材料表面以Cr2O3、NiO薄膜為主。經(jīng)氧化動(dòng)力學(xué)計(jì)算，多孔材料的活化能為152.18 kJ/mol。
關(guān)鍵字: 鎳基合金；多孔材料；高溫氧化；氧化動(dòng)力學(xué)
（School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan 430023, China）
Abstract:Porous Ni-Cr-Mo-Cu materials were fabricated by the activation reaction sintering method using Ni, Cr, Mo and Cu element powders as raw materials. The high temperature oxidation kinetic property was measured by the static mass gain method. And X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscope (XPS), energy dispersive spectroscopy (EDS) and pore size tester were conducted to characterize the surface oxide composition, structure and morphology of porous Ni-Cr-Mo-Cu materials at 600-800 ℃. The experimental results show that the oxidation kinetic of the porous material is pseudo-parabolic type. After oxidation at 800 ℃ for 20 h, the maximum pore size decreases from 13.32 μm to 9.52 μm, the air permeability decreases from 97.8 m3/(m2·kPa·h) to 81.3 m3/(m2·kPa·h), and the air permeability of the porous material only decreases by 16.8%. Furthermore, the high temperature oxidation mechanism of porous Ni-Cr-Mo-Cu materials was also investigated. The surfaces of the porous materials are composed of Cr2O3 and NiO films. Thorough the calculation of oxidation kinetics, the activation energy of the porous materials is 152.18 kJ/mol.
Key words: nickel based alloy; porous material; high temperature oxidation; oxidation kinetics
