磁场中浆料内部磁性粒子结构与形成机理研究  

Investigation on Microstructures of Suspension Composed of Ferromagnetic and Nonmagnetic Particles and Formation Mechanism in a Magnetic Field

作　　者：彭晓领[1] 马天宇[1] 罗伟[1] 严密[1] 

机构地区：[1]浙江大学硅材料国家重点实验室,浙江杭州310027

出　　处：《稀有金属材料与工程》2009年第A01期299-302,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50471041);高等学校博士学科点专项科研基金(2004335046);新世纪优秀人才支持计划(05-0526);教育部创新团队项目(IRT0651)资助

摘　　要：研究了由铁磁性Ni和非磁性ZrO2颗粒组成的混合浆料在磁场中的内部结构及其形成机理。结果表明,磁场下浆料中Ni粒子易于形成链状团簇,而且团簇尺寸随着磁场强度的增加和磁场施加时间的延长而增大。这是粒子受外场作用和粒子与粒子之间相互作用的结果。此外,还建立了磁场下链状团簇形成的简单物理模型,为磁场下制备功能梯度材料提供实验和理论依据。The microstructure of aqueous suspension containing Ni and ZrO2 particles in a static magnetic field was investigated. formation mechanism of the microstructure was discussed. The results show that Ni particles tend to form chain-like clusters in suspension under the external field, because of the dipole-field interaction and the dipole-dipole interaction among Ni particles clusters grew with applied field and the field loading time. Moreover, a simple physical model for the formation of chain-like clusters proposed to provide a foundation for the fabrication of ferromagnetic nonmagnetic FGMs.

关 键 词：磁性粒子 磁场 功能梯度材料 显微结构 

分 类 号：TB34[一般工业技术—材料科学与工程]