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Al2O3/Ni包裹粉体的制备、烧结行为及其显微结构研究
引用本文:卢金山,高濂,归林华,郭景坤.Al2O3/Ni包裹粉体的制备、烧结行为及其显微结构研究[J].无机材料学报,2001,16(2):277-282.
作者姓名:卢金山  高濂  归林华  郭景坤
作者单位:[1]中国科学院上海硅酸盐研究所高性能陶瓷与超微结构国家重点实验室,上海200050 [2]中国科学院上海硅酸盐研究所高
基金项目:国家自然科学基金(59632100); 上海市新材料研究中心(98 JC14021); 中国博士后科学基金资助项目
摘    要:利用非均相沉淀包裹技术,在铝无机盐溶液中制备出氧化铝前驱体包裹纳米镍颗粒的复合粉体,并通过能量发射能谱(EDS)以及俄歇电子能谱(AES)研究包裹粉体的成分构成,发现镍纳米颗料表面均匀地包裹一层氧化铝的前驱体。燃烧后的包裹粉体在氩气氛中进行热压烧结。结果表明,与溶胶-凝胶法制备的粉体相比,包裹粉体可以在较低的温度下达到致密化,烧结后的材料其显微结构明显不同于环磨粉体烧成的材料,否认在氧化铝晶界或晶内,镍颗粒与氧化铝之间都有孔隙,这是由于镍的热膨胀系数与氧化铝的热膨胀系数大引起的,Al2O3/Ni复合材料的断裂方式以及沿晶断裂为主。

关 键 词:包裹粉体  陶瓷-金属复合材料  烧结行为  显微结构  氧化铝  镍纳米颗粒
文章编号:1000-324X(2001)02-0277-06
收稿时间:2000-4-3
修稿时间:2000年4月3日

Preparation, Sintering Behavior and Microstructure of Al2O3-Coated Ni Powders
LU Jin-Shan,GAO Lian,GUI Lin-Hua,Guo Jing-Kun.Preparation, Sintering Behavior and Microstructure of Al2O3-Coated Ni Powders[J].Journal of Inorganic Materials,2001,16(2):277-282.
Authors:LU Jin-Shan  GAO Lian  GUI Lin-Hua  Guo Jing-Kun
Affiliation:StateKeyLaboratoryofHighPerformanceCeramicsandSuperfineMicrostructure;ShanghaiInstituteofCeramics;ChineseAcademyofSciences;Shanghai200050;China
Abstract:Alumina precursor-coated nanosized Ni powders were prepared by the heterogeneous precipitation method in the aluminium salt solution. The chemical composition of the as-prepared coated powder was characterized by energy dispersive spectra and Auger electron spectra. It revealed that nanosized Ni particles were homogeneously coated with layers of alumina hydrate. The calcined powders that were performed in argon were hot pressed in a protective atmosphere of argon. The experimental results indicate that the calcined powders can be sintered to nearly fully dense at a lower temperature as compared with that from sol-gel prepared powder mixtures. The microstructures of these sintered specimens are different from that of ball-milled and hot-pressed counterparts. Irrespective of the location of Ni particles in alumina matrix, there exist holes at the interfaces between alumina grains and Ni particles, which is attributed to thermal expansion mismatch between alumina and nickel. The fracture mode of these composites is mainly an intergranular-type.
Keywords:coated powders  ceramic-metal composite  sintering behavior  microstructure
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