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Synthesis and Consolidation of Nanostructured Nb₂C-Al₂O₃ Composite
Na-Ra Park1, Shin-Ho Kim2, In-Jin Shon2
1Department of Materials Science and Engineering, Korea University, Seoul 02841, Republic of Korea.
Abstract:
Although an extremely hard ceramic material, niobium carbide has low fracture toughness to use wide applications. To fabricate nanostructured composite is common method to improve fracture toughness. Nanopowder mixture of Nb₂C and Al₂O₃ were synthesized according to the reaction (Al₄C₃+6Nb+3O₂ → 3Nb₂C+2Al₂O₃) from Al₄C₃ and Nb powders by high-energy ball milling. The synthesized mixture of Nb₂C and Al₂O₃ powders was consolidated by pulsed current activated sintering method within two min under the 80 MPa pressure. Nb₂C and Al₂O₃ in the composite were nano-sized phases. The fracture toughness of a nanostructured Nb₂C-Al₂O₃ composite of this study is better than that of previous study.
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