Spark plasma sintering (SPS) and Self-propagating High-temperature synthesis/ quick pressing (SHS/QP) methods were used to fabricate nanotubes reinforced alumina. The difference in microstructure was discussed. In the...
Spark plasma sintering (SPS) and Self-propagating High-temperature synthesis/ quick pressing (SHS/QP) methods were used to fabricate nanotubes reinforced alumina. The difference in microstructure was discussed. In the SHS/QP process, the maximum densification temperature is 1660°C and the heating rate is about 1600°C /min. The whole densification process in SHS/QP is very short, which is much beneficial to protect the nanotubes and restrain the growing of grains. The fracture toughness of the sample prepared by SHS/QP is up to 4.9MPam½ for 1mass% CNTs/Al2O3 composites, which shows excellent toughening effects of nanotubes.
The lyophilization method was used to enhance platinum (Pt) nanoparticle distribution on single-walled cabon nanotube (SWCNT). The results indicate that this method is very availab.e to uniformly disperse nanotubes an...
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ISBN:
(纸本)9781424435432
The lyophilization method was used to enhance platinum (Pt) nanoparticle distribution on single-walled cabon nanotube (SWCNT). The results indicate that this method is very availab.e to uniformly disperse nanotubes and effectively prevent Pt metal particles from agglomeration. The Platinum nanoparticle size ranging from 2 to 5 nm in diameter and uniformly deposited on SWCNT characterized by both transmission electron microscopy (TEM) and X-ray diffraction (XRD), instead, Pt/ SWCNT catalysts fabricated by drying method present a lower dispersion degree compared with that by lyophilization method. The as-prepared catalysts have higher electrochemical active surface area and higher ORR activity as compared to that by drying method characterized by cyclic voltammetry (CV) and oxygen reduction reaction (ORR).
We prepared a novel hybrid membrane by doping recast Nafion @ membrane with SiO 2 -CNTs composites where carbon nanotubes (CNTs) were decorated with SiO 2 nano-particles. SiO 2 -CNTs were prepared via sol-gel method...
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ISBN:
(纸本)9781424435432;9781424435449
We prepared a novel hybrid membrane by doping recast Nafion @ membrane with SiO 2 -CNTs composites where carbon nanotubes (CNTs) were decorated with SiO 2 nano-particles. SiO 2 -CNTs were prepared via sol-gel method, and then mixed with nafion resin through sonication. Hydrophilic SiO 2 nano-particles were chosed to increase the water uptake of hybrid membrane, and the CNTs were chosed to improve the mechanical property of hybrid membrane. A series of tests show that water uptake and thermal performance¿two key performance of proton exchange membrane (PEM) are improved.
The influencing factors on the workpiece quality of aluminium alloy sheet forming, such as material properties, forming condition, stress status and lubrication types were concluded. And how to improve the performance...
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Analyzed the friction mechanism and lubrication characteristics during the aluminium alloy forming process. Influence of it on the workpiece quality of aluminium alloy sheet forming was concluded. And how to improve t...
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Highly ordered TiO 2 nanotube arrays prepared by electrochemical anodization gets considerable interest as a practical air purifier, since the nanotube arrays can form a TiO 2 film with a porous surface and straight...
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ISBN:
(纸本)9781424435432;9781424435449
Highly ordered TiO 2 nanotube arrays prepared by electrochemical anodization gets considerable interest as a practical air purifier, since the nanotube arrays can form a TiO 2 film with a porous surface and straight gas diffusion channel. Here, we investigate photocatalytic decompositions of HCHO over TiO 2 and Ag/TiO 2 nanotube arrays. Compared with the pure TiO 2 nanotube arrays with similar thickness and geometric area, the results showed that Ag loading TiO 2 nanotube arrays within a certain range could significantly improve the degradation rate of HCHO, the main product of HCHO degradation was detected to be CO 2 .
It has significance to further enhance the high-temperature properties of hypereutectic Al-Si alloys for its utilization in manufacture of engine parts. In this paper, high silicon Al-20Si-2Cu-1Ni-xCo casting alloys h...
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ISBN:
(纸本)9781622762866
It has significance to further enhance the high-temperature properties of hypereutectic Al-Si alloys for its utilization in manufacture of engine parts. In this paper, high silicon Al-20Si-2Cu-1Ni-xCo casting alloys have been prepared out with complex modification of RE-P, and the change of microstructure of the casting alloys under additions of Co and RE at the same time has been studied. The results show that, the content of Co varyingfrom 0 ∼ 1.5% has little influence on the refining effect of P on primary Si and the modification effect of RE on eutectic Si, but the amount of acicular RE-bearing compounds gradually increases with the increase of Co content. In addition, the addition of Co has the effect of neutralizing the harmful effect of Fe, and the Fe-containing intermetallic compound presents as particles instead of long needles.
Alkali recovery aiming at recovering NaOH is the best availab.e technology in China's pulp and paper industry;an alkali recovery boiler is a popular one among all alkali recovery units. For the purpose of designin...
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Alkali recovery aiming at recovering NaOH is the best availab.e technology in China's pulp and paper industry;an alkali recovery boiler is a popular one among all alkali recovery units. For the purpose of designing the most reasonable tube-panel of an evaporator in a 1500 t/d alkali recovery boiler, a total of 8 kinds of cases are put forward for finite element analysis. The modeling, meshing and calculation are carried out for each case. The stress values and their distribution rules are revealed in this paper. The slotting size for the water tubes panel is analyzed by using the optimum design module of ANSYS. After all cases are compared with each other, the optimal one is developed and exemplified in conclusion.
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