科研之友
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摘要
The unique mechanical, thermal, and electrical properties of carbon nanotubes (CNTs) make them an ideal reinforcement for the metal matrix composites (MMCs). The successful incorporation of CNTs as reinforcement in MMCs can result in the development of lightweight and high-strength structures which can eventually result in weight savings for the automobile and aerospace industries. In the last two decades extensive research has been carried out to improve the dispersion of CNTs in metal and polymer matrices. Challenges remain to effectively disperse CNTs within the matrix materials with minimal damage during the composite processing stages. The ultra-high Young's modulus and other superior mechanical and thermal properties of CNTs have been attributed to the strong sp(2) carbon-carbon (C-C) bonds present in their structures. In order to fully utilize the unique properties of CNTs as reinforcement, damages to CNTs in the form of damaging these sp(2)C-C bonds have to be minimized. A variety of processing techniques have been developed to fabricate CNTs reinforced MMCs but mechanical alloying (MA) via powder metallurgy (PM) is most widely used process to develop the nano-composites. The role of processing variables during PM and their effects on the structural integrity of CNTs have been reviewed in this work. Governing principles to predict the mechanical properties of CNTs with incorporating the key process variables are deduced. With the help of these governing equations, critical study of the processes parameters and their effects on the structural integrity of CNTs, it is possible to optimize the processing methodologies of CNTs reinforced MMCs and get the maximum benefit from the unique properties of CNTs. It is assumed that better dispersion of CNTs in the metal matrices, retaining the structural integrity of CNTs and optimization of process parameters would result in better mechanical and tribological properties of CNTs reinforced MMCs.
- 出版日期2016
