| Summary: | 碩士 === 國立臺灣科技大學 === 機械工程系 === 105 === The proposed system is subjected to use chemical vapor equipment for the synthesis of WS2 nanotubes and it infers the changes in preparation parameter for the growth of nanotubes. This system utilizes to use WS2 nanotube as one of the reinforcement material due to its excellent mechanical property.
The reinforcements selected for this work mainly uses WS2 nanotubes (0.5wt. %, 1wt. %), carbon nanotubes (0.5wt. %, 1wt. %) and silicon carbide particles (0.5wt. %, 1wt. %). It is to reinforce 6061 aluminum alloy with gravity casting method uses the stirring process. To examine the mechanical properties and microstructure of aluminum matrix composite materials.
For the preparation of WS2 nanotubes in the experiment, there are mainly three different parameter changes to examine the products of sulfide reactions, including increasing quartz stage, increasing carbon cloths, changing the temperature and changing the flow rate of hydrogen sulfide. The results show that by adding to the quartz stage increases the nanotubes’ sulfide reaction and produces nanotubes with smaller diameters than nanotubes without added quartz stage. In terms of increasing the flow rate of hydrogen sulfide, the results show that the increase in flow rate does not significantly enhance the sulfide effect, therefore we speculate that an appropriate amount of sulfide gas provides sufficient hydrogen sulfide for the sulfurization process. As for temperature parameters, the temperature range is 890°C-900°C with one set of experiment for every 10°C. The results show that the 890°C produces better sulfurization results and better types of nanotube, which explains that environments with this temperature range is improves the making of nanotubes.
Results from composite material experiments reveal that adding 1wt.% WS2 nanotubes to 6061 aluminum alloy results in better tensile strength and elongation, which are increased by 20.4% and 73.1%, respectively. We speculate that the reason for increased reinforcement is the bridging mechanism of the WS2 nanotubes which connects with the matrix to effectively transfer the load and thereby effectively increasing its mechanical properties.
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