The Al/fly ash composites are fabricated by liquid reactive sintering P/M process with fly ash particles as intensifying phases. The reactivity and newly formed phases during liquid sintering process have been analyze...The Al/fly ash composites are fabricated by liquid reactive sintering P/M process with fly ash particles as intensifying phases. The reactivity and newly formed phases during liquid sintering process have been analyzed by combing Thermochemicdl data base calculation and XRD characterization. The results show that some of constituents in fly ash have reacted with liquid aluminum so that the elemental Si, Fe, Ti as well as some amount of intermetallic compounds occur. The properties of aluminum/fly ash composites have been improved. With the fraction of fly ash increase, the composite density decreases; the hardness and the modulus of the composite increases, and the composite wear resistance are significantly increased. The fly ash reinforced composites represent a sort of low cost product with possible widespread applications in the automotive, small engine, and electromechanical machinery sectors.展开更多
The fly ash was added to melt to increase the melt viscosity. The main components are quartz and mullite in the fly ash, therefore it's a kind of hardness ceramic particles. After grinding for 10 h, the spherical ...The fly ash was added to melt to increase the melt viscosity. The main components are quartz and mullite in the fly ash, therefore it's a kind of hardness ceramic particles. After grinding for 10 h, the spherical particles increase and new surface is produced which will improve their performance. The cell wall was observed by SEM, many fly ash particles are in the wall. These particles tend to increase the molten aluminum surface viscosity, postpone the exhaust' course, sustain the liquid within the film and delay the onset of rupture. Finally, the aluminum foam with uniform cell structure can be obtained. The density is about 0.4 g/cm3, porosity is in the range of 85%-90% and the aperture is 4-7 mm.展开更多
文摘The Al/fly ash composites are fabricated by liquid reactive sintering P/M process with fly ash particles as intensifying phases. The reactivity and newly formed phases during liquid sintering process have been analyzed by combing Thermochemicdl data base calculation and XRD characterization. The results show that some of constituents in fly ash have reacted with liquid aluminum so that the elemental Si, Fe, Ti as well as some amount of intermetallic compounds occur. The properties of aluminum/fly ash composites have been improved. With the fraction of fly ash increase, the composite density decreases; the hardness and the modulus of the composite increases, and the composite wear resistance are significantly increased. The fly ash reinforced composites represent a sort of low cost product with possible widespread applications in the automotive, small engine, and electromechanical machinery sectors.
基金Project(2002AA334060) supported by the Hi-tech Research and Development Program of China
文摘The fly ash was added to melt to increase the melt viscosity. The main components are quartz and mullite in the fly ash, therefore it's a kind of hardness ceramic particles. After grinding for 10 h, the spherical particles increase and new surface is produced which will improve their performance. The cell wall was observed by SEM, many fly ash particles are in the wall. These particles tend to increase the molten aluminum surface viscosity, postpone the exhaust' course, sustain the liquid within the film and delay the onset of rupture. Finally, the aluminum foam with uniform cell structure can be obtained. The density is about 0.4 g/cm3, porosity is in the range of 85%-90% and the aperture is 4-7 mm.
