节点文献
Ni包裹Al2O3复合粉体的制备
Preparation of Nano-Ni-Coated-A12O3 Composite Powder
【摘要】 采用非均相沉淀工艺在Ａｌ２Ｏ３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Ａｌ２Ｏ３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．
【Abstract】 Nano-Ni-coated-A12 03 composite powder was prepared by the heterogeneous precipitation method. The amorphous NiCO3·2Ni(OH)2·2H2O was uniformly coated on the surfaces of Al2 O3 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.
【关键词】 非均相沉淀；
包裹；
Al2O3；
Ni；
复合粉体；
【Key words】 Ni-coated Al2O3； heterogeneous precipitation； continuous； discontinuous；
【Key words】 Ni-coated Al2O3； heterogeneous precipitation； continuous； discontinuous；
【基金】 国家973项目G2000067204－2
- 【文献出处】 无机材料学报 ,Journal of Inorganic Materials , 编辑部邮箱 ,2002年02期
- 【分类号】TB44
- 【被引频次】41
- 【下载频次】279