Park Na-Ra, Shon In-Jin
Department of Materials Science and Engineering, Korea University, Seoul 02841, Republic of Korea.
Division of Advanced Materials Engineering, The Research Center of Hydrogen Fuel Cell, Jeonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896, Republic of Korea.
J Nanosci Nanotechnol. 2021 Jul 1;21(7):4042-4045. doi: 10.1166/jnn.2021.19245.
Mixtures of Ta₂O and Al nanopowders were prepared using high energy ball milling method. Nanocrystalline Ta - 1.67Al₂O₃ composite was simultaneously synthesized and densified by pulsed current activated combustion synthesis method in a short time from mechanically activated mixtures of Ta₂O and Al powders. The relative density of the Ta - 1.67Al₂O₃ composites was 98%. The average grain sizes of Ta and Al₂O₃ in the Ta - 1.67Al₂O₃ composite heated up to 1520 °C were determined as 205 and 40 nm, respectively. A Vickers diamond indentation technique were used to evaluate the hardness and fracture toughness of the Ta - 1.67Al₂O₃ composite under applied load 20kg. The average Vickers hardness and fracture toughness value were 1340 kg/mm² and 7.9 MPa·m, respectively.
采用高能球磨法制备了Ta₂O和Al纳米粉末混合物。通过脉冲电流激活燃烧合成法，在短时间内由Ta₂O和Al粉末的机械激活混合物同时合成并致密化了纳米晶Ta - 1.67Al₂O₃复合材料。Ta - 1.67Al₂O₃复合材料的相对密度为98%。加热到1520℃的Ta - 1.67Al₂O₃复合材料中Ta和Al₂O₃的平均晶粒尺寸分别测定为205nm和40nm。采用维氏金刚石压痕技术评估了在20kg外加负载下Ta - 1.67Al₂O₃复合材料的硬度和断裂韧性。平均维氏硬度和断裂韧性值分别为1340 kg/mm²和7.9 MPa·m。
