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
A temperature programmed decomposition (TPD) apparatus with metal tube structure, in which Ar is used as the carrier gas, is established and the TPD spectrum of titanium hydride is acquired. Using consulting table met...A temperature programmed decomposition (TPD) apparatus with metal tube structure, in which Ar is used as the carrier gas, is established and the TPD spectrum of titanium hydride is acquired. Using consulting table method (CTM), spectrum superposition method (SSM) and differential spectrum technique, TPD spectrum of titanium hydride is separated and a set of thermal decomposition kinetics equations are acquired. According to these equations, the relationship between decomposition quantity and time for titanium hydride at the temperature of 940 K is obtained and the result well coincides with the AI alloy melt foaming process.展开更多
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.
基金Project(2011921065)supported by the Liaoning BaiQianWan Talents Program,ChinaProject(DUT11ZD115)supported by the Fundamental Research Funds for the Central Universities,China
基金This work was supported by the National Natural Science Foundation of China(Grant Nos.50231010,50081002,90205005 and 19982001).
文摘A temperature programmed decomposition (TPD) apparatus with metal tube structure, in which Ar is used as the carrier gas, is established and the TPD spectrum of titanium hydride is acquired. Using consulting table method (CTM), spectrum superposition method (SSM) and differential spectrum technique, TPD spectrum of titanium hydride is separated and a set of thermal decomposition kinetics equations are acquired. According to these equations, the relationship between decomposition quantity and time for titanium hydride at the temperature of 940 K is obtained and the result well coincides with the AI alloy melt foaming process.
