Synthesis of uniformly dispersed carbon nanotube reinforcement in Al powder for preparing reinforced Al composites |
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Authors: | Xudong Yang Chunsheng Shi Chunnian He Enzuo Liu Jiajun Li Naiqin Zhao |
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Affiliation: | aSchool of Materials Science and Engineering, Tianjin University, Tianjin 300072, China;bTianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300072, China |
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Abstract: | In order to obtain homogeneously dispersed carbon nanotube (CNT) reinforcement with well structure in Al powder, a novel and simple approach was developed as a means of overcoming the limits of traditional mixing methods. This process involves the even deposition of Ni catalyst onto the surface of Al powder by impregnation route with a low Ni content (0.5 wt.%) and in situ synthesis of CNTs in Al powder by chemical vapor deposition. The in situ synthesized CNTs with well-crystallized bamboo-like structure in the composite powders can obviate the reaction with Al below 1000 °C. The feasibility of fabricating CNT/Al composites with high mechanical properties using the as-prepared composite powders was proved by our primary test, which indicated that the compressive yield stress and elastic modulus of 1.5 wt.%-CNT/Al composites synthesized by hot extrusion are 2.2 and 3.0 times as large as that of the pure Al matrix. |
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Keywords: | A. Nano-structures A. Metal&ndash matrix composites (MMCs) B. Mechanical properties E. Chemical vapor deposition (CVD) |
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