(武汉轻工大学 机械工程学院，武汉 430023)
摘 要: 以Ni、Cr、Mo、Cu为原料，采用活化反应烧结制备Ni-Cr-Mo-Cu多孔材料，采用静态增重法测定其氧化动力学性能，利用X射线衍射(XRD)、扫描电镜(SEM)、X射线光电子能谱(XPS)、能谱仪(EDS)、孔径测试仪等分析手段表征了Ni-Cr-Mo-Cu多孔材料在600~800 ℃的表面氧化膜组成、结构和形貌等氧化行为。结果表明：多孔材料的氧化动力学近似抛物线演变规律，在800 ℃氧化20 h后，最大孔径从13.32μm下降到9.52μm，透气率从97.8 m3/(m2·kPa·h)下降到81.3 m3/(m2·kPa·h)，多孔材料的透气度仅下降了16.8%。重点探讨了Ni-Cr-Mo-Cu多孔材料在高温条件下的氧化机理，多孔材料表面以Cr2O3、NiO薄膜为主。经氧化动力学计算，多孔材料的活化能为152.18 kJ/mol。
关键字: 镍基合金；多孔材料；高温氧化；氧化动力学
（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
