A Study on the Fabrication of Aluminum / Carbon Nanohorn and Aluminum / Carbon Nanotube Composite and Their Mechanical Properties

• Main Authors: LI,DAI-YING, 李岱穎
• Other Authors: CAI,YI-SHOU
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/ezt84k

碩士 === 逢甲大學 === 纖維與複合材料學系 === 107 === In this study, we prepared aluminum/carbon nanohorn and aluminum/carbon nanotube composites by powder metallurgy method, and discussed also the dispersibility and shape of the material powders of aluminum/carbon nanohorn and aluminum/carbon nanotube composites. The raw material of the composite material was 6003 aluminum alloy powder as a substrate, and two carbon materials (carbon nanohorn, carbon nanotube) were additives. We also analyzed the effect of carbon material amount on the tensile and compressive properties of aluminum/carbon composites. Finally, we explored weather aluminum alloys and carbon materials would produce new alloy phases by XRD analysis. The experiment is divided into two parts: The first part discusses the effects of different processes on the powder’s dispersibility of aluminum/carbon nanohorn and aluminum/carbon nanotube composites. The first process is a wet ball milling method; the second process is a method of adding a wetting agent to pre-disperse the nano powders before performing wet ball milling. Both are using the same process parameters and different dispersion methods to explore the dispersion effect of the powders. The experimental results showed the surfaces of the powders were rough and smooth after the first processing or the second processing, and both dispersion methods were mixed well. The compression performance test of the two process composites, compared with the pure aluminum substrate, revealed that the hardness and Young's modulus were increased with the addition of the carbon nanotubes and the carbon nanohorns, although the failure work, the load and the displacement are decreased. This demonstrated that the effect of reinforcement is obtained, and the composite material also becomes brittle. The rigid reinforcing effect of adding the wetting agent (Process 2) was more obvious (the Young's modulus increased greatly), but the tensile performance test in this study is not as expected, due to the structure being too loose. The second part discusses the effects of different carbon material additions on the mechanical properties of aluminum/ carbon nanohorn and aluminum/carbon nanotube composites, and further explores which carbon material structure has the best reinforcing effect. The experimental results showed that the addition of either carbon nanotubes or carbon nanohorn could effectively improve the hardness and Young's modulus, and the highest Young's modulus was obtained when the addition amount is 1.5 wt%, and the reinforcing effect of carbon nanohorn was better than carbon nanotube. The destructive work, the falling load and the decreasing displacement were all decreased, and the hardness of the composites made of carbon nanotube and the carbon nanohorn were not identical. XRD analysis showed that the both composites could not formed a new alloy phase, the carbon material couldn’t be effectively embedded in the lattice of aluminum. Due to the limitations of forming conditions, the current results cannot be applied to the industry. For subsequent experiments in the future, the pressure and sintering temperature should be increased to achieve abundant compaction to improve mechanical properties, or to prepare the composite powders by using a wetting agent for pre-dispersion of nano powders, and then by hot extrusion. The composite material is prepared in a manner such that the reinforcing material can be directional and orintated in the extrusion process, thereby improving its properties to meet the needs of the industry.