【摘要】 在(Fe-Cr)(40)-Al(60)粉末中掺杂0.5%、1%、3%、5%(质量分数)钨精矿粉末,压制成坯,并对压坯进行激光引燃自蔓延烧结,制备原位自生颗粒增强复合材料。采用OM、XRD等微观组织结构表征手段及合金密度、孔隙率、硬度、磨损性能等宏观力学性能及腐蚀性能测试方法,研究不同钨精矿粉末含量对烧结合金组织及性能的影响。结果表明:烧结合金物相主要为Al Fe,Al Fe3,Al2O3,W,WO3及(Al-Fe)4Cr。烧结合金组织均匀细小,以颗粒状弥散分布于基体中。当钨精矿粉含量为1%时,烧结合金密度最大,为3.969 g/cm3,孔隙率最小,为9.01%;合金硬度最高,为13 210 MPa;磨损率最低,为0.47 mg/mm2;自腐蚀电位最大,为325.790 m V,腐蚀电流密度最小,为182.2μA·mm-2,耐蚀性能最好。更多还原

【Abstract】 0.5 wt%, 1 wt%, 3 wt% and 5 wt% tungsten concentrate powders were added into(Fe-Cr)(40)-Al(60) powder, followed by compacting to obtain powder compacts.The in-situ particle reinforced composites were prepared by self-propagating laser sintering.Effects of tungsten concentrate powder content on microstructure and properties were investigated by OM and XRD.In addition, density, porosity, hardness, wear resistance and other macro-mechanical properties and corrosion resistance of the sintered alloy were also tested.The results show that the sintered alloy phases are mainly Al Fe, Al Fe3, Al2O3, W, WO3 and(Al-Fe)4Cr.The microstructure of the sintered alloy is fine and homogeneous with dispersed distribution in the matrix.When the tungsten concentrate powder content is 1%, the maximum density of 3.969 g/cm3, the minimum porosity of 9.01%, the highest hardness of 13 210 MPa, the lowest wear rate of 0.47 mg/mm2, the maximum corrosion potential of 325.790 m V and the minimum corrosion current density of 182.2 μA·mm-2 are achieved.The best corrosion resistance is also realized.更多还原