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Effects of Additives on Microstructure and Properties of Alumina‐Silicon Carbide Nanocomposites
Author(s) -
Jeong YoungKeun,
Nakahira Atsushi,
Niihara Koichi
Publication year - 1999
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1999.tb02286.x
Subject(s) - microstructure , materials science , sintering , hot isostatic pressing , nanocomposite , silicon carbide , composite material , hot pressing , dopant , flexural strength , carbide , doping , metallurgy , optoelectronics
Al 2 O 3 /5‐vol%‐SiC nanocomposites have been fabricated by using pressureless sintering with MgO and/or Y 2 O 3 sintering aids and post‐hot isostatic pressing (HIPing), which circumvents the limitations of hot pressing. Al 2 O 3 /SiC nanocomposites that have been doped with 0.1 wt% MgO and 0.1 wt% MgO + 0.1 wt% Y 2 O 3 show an increased sintering density and a homogeneous microstructure, as well as a high fracture strength (1 GPa) after HIPing. In contrast, using Y 2 O 3 as a dopant has a negative impact on the microstructure and the fracture strength. The results suggest that MgO, as a sintering additive, has a key role in improving the densification and controlling the microstructure of Al 2 O 3 /SiC nanocomposites.