A carbon nanotube/alumina network structure for fabricating alumina matrix composites

作者：He C N^*; Tian F; Liu S J

来源：Journal of Alloys and Compounds, 2009, 478(1-2): 816-819.

DOI：10.1016/j.jallcom.2008.12.027

• Composite materials
• Inorganic materials
• Chemical synthesis
• Mechanical properties

A network structure of carbon nanotubes (CNTs) and nickel/alumina (CNT(Ni)-Al(2)O(3)) composite particles was developed, which involved producing a Ni(OH)(2)/Al precursor, followed by calcination in air and reduction in hydrogen to yield a Ni/Al(2)O(3) catalyst with a network structure, which was used to synthesize nanotubes by chemical vapor deposition. The CNT(Ni)-Al(2)O(3) hybrid was then employed to produce alumina matrix composites by spark plasma sintering of the CNT(Ni)-Al(2)O(3) composite powder. Microstructure and mechanical properties of the composites were characterized. The results showed that the CNTs dispersed homogenously and bonded strongly with the alumina matrix and the composites showed a 67% increase in fracture toughness and 17.5% increase in hardness compared to monolithic alumina. The improvement of the fracture toughness and hardness was attributed to the network structure of CNT(Ni)-Al(2)O(3), which ensured homogenously dispersed CNTs in the matrix and tight interfacial bonding between CNTs and alumina matrix, and thus led to a good stress transfer between the nanotube and alumina matrix.

• 出版日期2009-6-10
• 单位河北医科大学; 中国人民解放军军事医学科学院