(武汉轻工大学 机械工程学院，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。用静态增重法测定其氧化动力学曲线，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。实验结果表明：其氧化动力学近似抛物线演变规律,氧化20 h后，最大孔径从13.32μm下降到9.52μm，透气率从97.8 m3·m-2·kPa-1·h-1下降到81.3 m3·m-2·kpa-1·h-1，多孔材料的透气度仅下降了16.8%，并重点探讨了Ni-Cr-Mo-Cu多孔材料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，其活化能为153.73kJ/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 alloys were fabricated by the activation reaction sintering method using Ni, Cr, Mo and Cu element powders as raw materials. The high temperature oxidation kinetic curve was measured by the static weight-gained 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 at 600-800℃. The experimental results illustrate that the oxidation kinetic of the porous material is pseudo-parabolic type. When the temperature remains 800℃ for 20h, the maximum pore size decreased from 13.32μm to 9.52μm, the air permeability decreased from 97.8 m3·m-2·kPa-1·h-1 to 81.3 m3·m-2·kPa-1·h-1, and the air permeability of the porous material only decreases by 16.8%. Furthermore, the high temperature oxidation mechanism of Ni-Cr-Mo-Cu porous materials is also investigated. The surfaces of the porous materials are composed of Cr2O3 and NiO films. Thorough the calculation of oxidation kinetics, the activation energy is 153.73 kJ/mol.
Key words: Nickel based alloy; Porous materials; High temperature oxidation; Oxidation kinetics
