Metal matrix composites reinforced with carbon nanotubes by an alternative technique

• Published in: Journal of alloys and compounds 2017-06, Vol.707, p.257-263
• Main Authors: Isaza Merino, Cesar A., Ledezma Sillas, J.E., Meza, J.M., Herrera Ramirez, J.M.
• Format: Article
• Language: English
• Subjects: Aerospace industry; Aircraft components; Carbon fiber reinforced plastics; Ceramic fibers; Magnesium; Mechanical properties; Metal matrix composites; Multi wall carbon nanotubes; Nanoindentation; Reinforcement
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2016.11.348

The metal matrix composites (MMCs) have been used in several applications where high specific resistance and temperature are required for some uses in the aerospace and aeronautic industry. In general, these composites are manufactured using as reinforcing material particles or some fibers like glass, ceramic and carbon fibers. Recently a new manufacturing process for the production of MMCs reinforced with carbon nanotubes, known as sandwich technique has been proposed. This technique produces materials comprised of a metallic matrix and banded structured-layers of multiwall carbon nanotubes (MWCNTs). However, among other issues, the matrix-reinforcement interface and the reinforcement dispersion degree are still open questions. The present study has been aimed on the reinforcement of magnesium sheets with MWCNTs by the sandwich technique. Field emission scanning electron microscopy was used to demonstrate that the method is capable of producing a good dispersion of the MWCNTs with no evidence of damage. The mechanical properties were measured by tensile and nanoindentation tests; yield and ultimate strengths, elastic modulus and hardness were increased with respect to the unreinforced material. •Sandwich technique developed for MWCNTs reinforced metallic matrix composites.•MWCNTs well dispersed and aligned into the Mg matrix.•Bulk- and small-scale mechanical properties enhancement of the Mg/MWCNTs composites.