- Microstructure and Properties of Cu Dispersed Al2O3 Nanocomposites Prepared by Pressureless Sintering
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Kyong-Hwan Lee, Sung-Tag Oh
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J Korean Powder Metall Inst. 2009;16(4):280-284.
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DOI: https://doi.org/10.4150/KPMI.2009.16.4.280
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 Abstract
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- The pressureless sintering behavior of Al_2O_3/Cu powder mixtures, prepared from Al_2O_3/CuO and Al_2O_3/Cu-nitrate, has been investigated. Microstructural observation revealed that Al_2O_3 powders with nano-sized Cu particles could be synthesized by hydrogen reduction method. The specimens, pressureless-sintered at 1400°C for 4 min using infrared heating furnace with the heating rate of 200°C/min, showed the relative density of above 90%. Maximum hardness of 16.1 GPa was obtained in Al_2O_3/MgO/Cu nanocomposites. The nanocomposites exhibited the enhanced fracture toughness of 4.3-5.7 MPacdotm1/2, compared with monolithic Al_2O_3. The mechanical properties were discussed in terms of microstructural characteristics.
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