无机材料学报

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晶内/晶间复合型Al2O3/Ni纳米金属陶瓷显微结构和力学性能的研究

李国军1,2; 黄校先1; 郭景坤1   

  1. 1.中国科学院上海硅酸盐研究所 上海 200050; 2. 北京航空材料研究院先进复合材料国防科技重点实验室, 北京 100095
  • 收稿日期:2001-11-26 修回日期:2002-01-10 出版日期:2003-01-20 网络出版日期:2003-01-20

Microstructure and Mechanical Properties of the Intra/Inter-type Al2O3/Ni Nanocermets

LI Guo-Jun1,2; HUANG Xiao-Xian1; GUO Jing-Kun1   

  1. 1.Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China;2. National Key Lab of Advanced Composites; Beijing Institute of Aeronautic Materials; Beijing 100095; China
  • Received:2001-11-26 Revised:2002-01-10 Published:2003-01-20 Online:2003-01-20

摘要: 采用非均相沉淀法和热压工艺制备了Al2O3/Ni纳米金属陶瓷.在1450℃热压γ-Al2O3/Ni复合粉体得到相对密度>98%的金属陶瓷.结果表明,Ni颗粒均匀分布在基体中,其中<100nm的Ni颗粒位于Al2O3晶内,100-300nm的分布在晶界,形成了晶内/晶界复合型纳米金属陶瓷.同单相Al2O3相比,Al2O3/Ni金属陶瓷的三点抗弯强度和断裂韧性分别增加了26%和79%.分析了纳米金属陶瓷的增强增韧机制.

关键词: Al2O3/Ni纳米金属陶瓷, 非均相沉淀法, 显微结构, 力学性能

Abstract: Al2O3/Ni nanocermets were prepared by the heterogeneous precipitation method and hot-pressing technique. The strengthening and toughening
mechanisms of the nanocermets with respect to the microstructure were analyzed.Hot-pressed at 1450℃, a more than 98% theoretical density of the
cermets can be achieved. Microstructural observations reveal that Ni grains are uniformly dispersed in the Al2O3 matrix, some fine Ni grains of less than
100nm are entrapped within Al2O3 grains, some Ni grains about 100~300nm are distributed at the grain boundaries, forming intra/inter-type nanocermets.
With Ni addition, the three-point bending strength and the fracture toughness of the dense Al2O3/Ni cermets increase by 26% and 79%, respectively.

Key words: Al2O3/Ni nanocermets, heterogeneous precipitation method, microstructure, me- chanical properties

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