无机材料学报

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Ni包裹Al2O3复合粉体的制备

李国军; 赵世柯; 黄校先; 郭景坤   

  1. 中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室 上海 200050
  • 收稿日期:2001-03-22 修回日期:2001-04-04 出版日期:2002-03-20 网络出版日期:2002-03-20

Preparation of Nano-Ni-Coated-A12O3 Composite Powder

LI Guo-Jun; ZHAO Shi-Ke; HUANG Xiao-Xian; GUO Jing-Kun   

  1. State Key Lab of High Performance Ceramics and Superfine Microstructure; Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China
  • Received:2001-03-22 Revised:2001-04-04 Published:2002-03-20 Online:2002-03-20

摘要: 采用非均相沉淀工艺在Al颗粒表面均匀地包裹上镍盐前驱体,经煅烧、还原后得到纳米晶Ni包裹Al复合粉体.相分析表明,非晶态的镍盐前驱体在550℃已转变为NiO,再经700℃氢气处理后,NiO还原为Ni,其晶粒尺寸约为20nm。结构分析表明,复合粉体在热处理过程中,包裹层由连续态变为非连续态.

关键词: 非均相沉淀, 包裹, Al2O3, Ni, 复合粉体

Abstract: Nano-Ni-coated-A12O3 composite powder was prepared by the heterogeneous precipitation method. The amorphous NiCO3·2Ni(OH)2·2H2O was uniformly coated on the surfaces of Al2O3 particles. The amorphous coating layers were crystallized to NiO at 550℃ for 2h in air. NiO was completely reduced to Ni at 700℃ for 4h in hydrogen atmosphere. Ni with the size of about 20nm in the coating layers was spherical and weakly agglomerated. The continuous coated layers became discontinuous during heating treatment.

Key words: Ni-coated Al2O3, heterogeneous precipitation, continuous, discontinuous

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