Abstract
Carbon nanotube (CNT) and silicon carbide particles (SiCp) can work together as a double-scale hybrid reinforcement for new metal matrix composites. In this paper, nano nickel (Ni) particle catalyst was precipitated by carbamide to achieve uniform dispersion on micron SiCp. And then a CNT-covered SiCp hybrid was synthesized by a conventional Chemical Vapor Deposition (CVD) method. We found that the content of Ni catalyst has great effects on the size and production of CNT. The yield of CNT reached 20.73 wt.% with 5.0 wt.% Ni under the condition of 923 K and 1 h for CVD process. The diameter and average length of the as-grown CNT are 20~30 nm and 3 μm, respectively. Meantime, the chemistry during the controllable growth of CNT was analyzed on the basis of experimental results.
Highlights
Interest in Carbon nanotube (CNT) reinforced metal matrix composites (MMCs) has been motivated among research groups since the first discovery by Iijima [1]
Owing to its low density, high aspect ratio, elastic modulus and mechanical strength [2,3,4], CNT is predicted as an ideal reinforcement for aluminum matrix composites (AMCs), which have been widely applied in aerospace, defense and petrochemical industries
Kuzumaki [5] fabricated CNT/Al composites by hot-pressing and hot-extrusion, they found that the tensile strength of CNT/Al composite is much lower than the theoretical estimation
Summary
Interest in CNT reinforced metal matrix composites (MMCs) has been motivated among research groups since the first discovery by Iijima [1]. Introducing micro-sized particle as a carrier by chemical vapor deposition (CVD) is a novel solution to realize the uniform dispersion of CNT in metal matrix. This method, without the damage of CNT, has been recognized to be more convenient than those methods mentioned above [12, 13]. Carbide Particles Via Chemical Vapor Deposition the merit of nano-sized CNT and micro-sized SiCp together to form a hybrid reinforcement-SiCp(CNT), in which SiCp, CNT were used as primary, secondary reinforcements respectively in the matrix In this way, we can achieve uniform dispersion of CNT in the matrix, together with a double-scale hybrid reinforcement.
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