Department of Materials Science and Engineering, Korea University, Seoul 02841, Republic of Korea.
Division of Advanced Materials Engineering and the Research Center of Hydrogen Fuel Cell, Engineering College, Chonbuk National University, 561-756, Republic of Korea.
J Nanosci Nanotechnol. 2019 Apr 1;19(4):2349-2353. doi: 10.1166/jnn.2019.15978.
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.
虽然碳化铌是一种极硬的陶瓷材料，但它的断裂韧性低，限制了其广泛应用。制造纳米结构复合材料是提高断裂韧性的常用方法。根据反应（Al₄C₃+6Nb+3O₂ → 3Nb₂C+2Al₂O₃），将 Al₄C₃ 和 Nb 粉末通过高能球磨合成 Nb₂C 和 Al₂O₃ 的纳米粉末混合物。将合成的 Nb₂C 和 Al₂O₃ 粉末混合物在 80 MPa 压力下通过脉冲电流激活烧结法在两分钟内固结。复合材料中的 Nb₂C 和 Al₂O₃ 为纳米级相。本研究的纳米结构 Nb₂C-Al₂O₃ 复合材料的断裂韧性优于以往研究。
