In this study, open cell aluminum foams were produced using the polymer impregnating method. This method consists of slurry preparation, template coating, drying, burning and finally sintering. Physical properties of the open cell aluminum foams were characterized. Microstructures were investigated utilizing optical and scanning electron microscopy. Cu K_{α} was used as X-ray source in phase analysis. The hardness of the foams was measured by applying Vickers hardness test. An ideal foam coating was achieved using the slurry having 60% solid content mixed with a speed of 1000 rpm for 3 h. The polyurethane foam was burned out at 500C and ideal sintering parameters were 620C for 4 or 7 h. The foam densities containing 60% solid were found to be 0.12-0.15 g/cm^3. The porosity values were calculated to be in the range of 94.4-95.5%. Micro hardness values were 30.3-34.7 Hv.
This study is devoted to the investigation of metallic foams based on tin-lead alloy (with 50% of tin content) by the liquid metal infiltration process. Uniaxial tensile tests were performed at room temperature in order to study mechanical properties of foams of different relative density and cell size. The samples were concurrently characterized on a microscopic scale (metallography and hardness) in order to link the morphological and mechanical characteristics of the constitutive phases.
In order to survive the competition, the processing cycle time and the energy consumption of the rotational foam molding process must be reduced to a fraction of its current levels without compromising product quality. This paper introduces a novel extrusion-assisted rotational foam molding process for the manufacture of rotational moldings having adjacent, but clearly distinct, layers of an integrated solid (non-cellular) skin boundary layer encapsulating a cellular core structure, consisting of identical or compatible polyolefin grades, that achieves significant savings in processing cycle time duration and energy consumption. It introduces non-chilled extruded foam as a foamed core-forming material, in real time, directly into a uni-axially rotating hot mold through a dedicated mold "injection" port onto the already formed un-foamed soft skin layer.
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