Aluminium Based Composites Reinforced with Alumina Coated Fibers
Abstract
Fine Al2O3 coating can be obtained from alumina sols modified by chelator acetylacetone, with exact control of the synthesis parameters. Coating with alumina by the sol-gel method on a carbon fiber (CF) surface was investigated in detail to improve the oxidation resistance of carbon fibers. Results show that the viscosity of alumina sol is the decisive factor in coating uniformity. After the coating treatment, the cracks and defects on CF surfaces are covered by a uniform Al2O3 thin film of nanoscale thickness. Furthermore, the oxidation resistance of the carbon fibers is enhanced, and the wettability between the fibers and melting aluminum is greatly improved. Further study focused on making alumina coated fiber reinforced aluminum(CF/Al) composite wires. The coating effectively prevents harmful interfacial reactions between carbon fibers and aluminum matrix. The mechanical property of CF/Al preformed wire was improved considerably when the carbon fiber surface was coated with Al2O3. Keywords: sol-gel, alumina, carbon fibers, nanoscale coating, CF/Al composite wires
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2003
- Bibcode:
- 2003APS..MARK19011Q