为制备性能优良的 Al2 O3/Fe复合型蜂窝材料，首先以316 L 合金粉末、Al2 O3粉末和黏结剂为原料，通过粉末增塑挤压及在1200℃氩气气氛中烧结2 h获得了Al2 O3/Fe复合型蜂窝材料；然后，借助SEM、XRD及万能试验机研究了添加 Al2 O3对 Al2 O3/Fe复合型蜂窝材料组织与性能的影响。结果表明：金属粉末颗粒在烧结过程中结合形成γ-Fe基体网状组织，表面有呈多边形几何状形态的 Cr2 O3形成；添加少量的 Al2 O3可以抑制 Cr从基体中析出，降低表面Cr2 O3的含量，使金属颗粒烧结结合更为紧密，组织表面更加光滑；随着 Al2 O3含量的增加，蜂窝材料表面与催化活性涂层的结合能力增强，复合型蜂窝材料的抗压强度先升高后降低；在 Al2 O3含量为5.0wt%时，抗压强度达26 MPa。所得结论表明5.0wt% Al2 O3/Fe复合型蜂窝材料力学性能最佳，表面涂覆性能优良。
In order to fabricate Al2 O3/Fe composite honeycombs with high-performances,316L alloy powder, Al2 O3 powder and binder were used as raw materials,Al2 O3/Fe composite honeycombs were obtained by plasticizing powder extrusion and sintering at 1 200 ℃ for 2 h in argon atmosphere firstly.Then,the effects of adding Al2 O3 on the structures and properties of Al2 O3/Fe composite honeycombs were investigated by SEM,XRD and universal testing machine.The results show that metal powder particles bind together to formγ-Fe matrix network structure during sintering process,and Cr2 O3 with polygon geometric shape is formed on the surface.Adding a small amount of Al2 O3 can inhibit the precipitation of Cr from matrix and reduce the amount of Cr2 O3 on the surface,which makes the sintering combination of metal powder particles more compact and the surface of structure more smooth.With Al2 O3 content increasing,the bonding capacity for the surface of honeycomb materials with catalytic activity coating enhances,compressive strength of the composite honeycomb increases at first and then decreases,and when Al2 O3 content is 5.0wt%,the compressive strength reaches 26 MPa.The conclusions obtained show that the mechanical properties of 5.0wt% Al2 O3/Fe composite honeycomb are the best,and the surface paintability is preferable.
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