TY - JOUR
T1 - Fabrication of alumina-based metal nanocomposites by pressureless sintering and their mechanical properties
AU - Oh, Sung Tag
AU - Lee, Sung Ll
PY - 2010/1
Y1 - 2010/1
N2 - The processing conditions to prepare nano-sized Cu and Mo dispersed Al 20 3 (Al 20 3/Cu and AI 20 3/Mo) composites by pressureless sintering were explored. The composite powders of Al 20 3/Cu and AI 20 3/Mo were obtained by the hydrogen reduction of AI 20 3/CuO and AI 20 3/Mo03 powder mixtures and consolidated by pressureless sintering using infrared heating furnace with a heating rate of 200 °C/min. SEM and TEM analyses for the composite showed that the nano-sized metal particles were well distributed and situated on the grain boundaries of the Al 20 3 matrix. The nanocomposites, sintered at 1300 to 1500 deg;C for 4 min, showed the relative density of above 90%. Maximum hardness of 16.1 GPa was obtained in Al 20 3/Cu nanocomposites with sintering additive of 1 wt% MgO. The sintered nanocomposites exhibited the enhanced fracture toughness of above 4.5 MPa-m1/2, compared with monolithic Al 20 3. The mechanical properties were discussed in terms of observed microstructural characteristics.
AB - The processing conditions to prepare nano-sized Cu and Mo dispersed Al 20 3 (Al 20 3/Cu and AI 20 3/Mo) composites by pressureless sintering were explored. The composite powders of Al 20 3/Cu and AI 20 3/Mo were obtained by the hydrogen reduction of AI 20 3/CuO and AI 20 3/Mo03 powder mixtures and consolidated by pressureless sintering using infrared heating furnace with a heating rate of 200 °C/min. SEM and TEM analyses for the composite showed that the nano-sized metal particles were well distributed and situated on the grain boundaries of the Al 20 3 matrix. The nanocomposites, sintered at 1300 to 1500 deg;C for 4 min, showed the relative density of above 90%. Maximum hardness of 16.1 GPa was obtained in Al 20 3/Cu nanocomposites with sintering additive of 1 wt% MgO. The sintered nanocomposites exhibited the enhanced fracture toughness of above 4.5 MPa-m1/2, compared with monolithic Al 20 3. The mechanical properties were discussed in terms of observed microstructural characteristics.
KW - Ceramic nanocomposites
KW - Metal dispersion
KW - Pressureless sintering
UR - https://www.scopus.com/pages/publications/77955075355
U2 - 10.1166/jnn.2010.1544
DO - 10.1166/jnn.2010.1544
M3 - Article
AN - SCOPUS:77955075355
SN - 1533-4880
VL - 10
SP - 366
EP - 369
JO - Journal of Nanoscience and Nanotechnology
JF - Journal of Nanoscience and Nanotechnology
IS - 1
ER -