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为制备性能优良的Al_2O_3/Fe复合型蜂窝材料,首先以316L合金粉末、Al_2O_3粉末和黏结剂为原料,通过粉末增塑挤压及在1 200℃氩气气氛中烧结2h获得了Al_2O_3/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Al_2O_3对Al_2O_3/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Cr_2O_3形成;添加少量的Al_2O_3可以抑制Cr从基体中析出,降低表面Cr_2O_3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Al_2O_3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Al_2O_3含量为5.0wt%时,抗压强度达26 MPa。所得结论表明5.0wt%Al_2O_3/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 prepare Al 2 O 3 / Fe composite honeycomb materials with excellent properties, firstly, 316L alloy powder, Al 2 O 3 powder and binder were used as raw materials to obtain Al 2 O 3 / Fe composite by powder plastic extrusion and sintering in 1 200 ℃ argon atmosphere for 2h. Type honeycomb material. Then, the effects of adding Al 2 O 3 on the microstructure and properties of Al 2 O 3 / Fe composite honeycomb materials were studied by means of SEM, XRD and universal testing machine. The results show that the metal powder particles combine to form γ-Fe matrix reticular structure during sintering, and the surface is characterized by a polygonal geometry of Cr 2 O 3. Addition of a small amount of Al 2 O 3 can inhibit the precipitation of Cr from the matrix and reduce the content of Cr 2 O 3 The sintering of the metal particles is more compact and the surface of the microstructure is smoother. With the increase of Al 2 O 3 content, the binding ability of the honeycomb surface to the catalytically active coating increases. The compressive strength of the composite honeycomb firstly increases and then decreases. When the Al 2 O 3 content At 5.0 wt%, the compressive strength reaches 26 MPa. The results show that 5.0wt% Al 2 O 3 / Fe composite honeycomb has the best mechanical properties and excellent surface coating properties.