상압소결법으로 제조한 Cu 입자 분산 Al2O3 나노복합재료의 미세조직 및 특성
Microstructure and Properties of Cu Dispersed Al2O3 Nanocomposites Prepared by Pressureless Sintering
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The pressureless sintering behavior of Al2O3/Cu powder mixtures, prepared from Al2O3/CuO and Al2O3/Cu-nitrate, has been investigated. Microstructural observation revealed that Al2O3 powders with nano-sized Cu particles could be synthesized by hydrogen reduction method. The specimens, pressureless-sintered at 1400℃ for 4 min using infrared heating furnace with the heating rate of 200℃/min, showed the relative density of above 90%. Maximum hardness of 16.1 GPa was obtained in Al2O3/MgO/Cu nanocomposites. The nanocomposites exhibited the enhanced fracture toughness of 4.3-5.7 MPa·m1/2, compared with monolithic Al2O3. The mechanical properties were discussed in terms of microstructural characteristics
Abstract
The pressureless sintering behavior of Al2O3/Cu powder mixtures, prepared from Al2O3/CuO and Al2O3/Cu-nitrate, has been investigated. Microstructural observation revealed that Al2O3 powders with nano-sized Cu particles could be synthesized by hydrogen reduction method. The specimens, pressureless-sintered at 1400℃ for 4 min using infrared heating furnace with the heating rate of 200℃/min, showed the relative density of above 90%. Maximum hardness of 16.1 GPa was obtained in Al2O3/MgO/Cu nanocomposites. The nanocomposites exhibited the enhanced fracture toughness of 4.3-5.7 MPa·m1/2, compared with monolithic Al2O3. The mechanical properties were discussed in terms of microstructural characteristics
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