聚氨酯基磁流变材料磁控电磁学特性研究
发布时间：2018-09-19 12:39
【摘要】：磁流变材料是一种磁控智能材料,主要由高分子聚合物基体和微米级磁性颗粒组成。磁流变材料内部磁性颗粒分布和颗粒的磁化强度都会因外加磁场的变化而发生改变,因而其电磁学特性可以在磁场控制下发生连续可逆变化,使其在传感器件、智能吸波材料、磁控电学元件、仿生皮肤等领域都具有很大的发展潜力和应用前景。由于目前磁流变材料磁控电磁学特性研究还很薄弱,本文以聚氨酯材料为基体,分别对磁流变胶的磁控电阻特性和预结构磁流变弹性体的介电常数、磁导率和吸波性能进行了研究。具体工作包括以下几个方面:(1)介绍了不同磁流变材料的特点以及磁流变材料磁控电磁学特性研究的国内外现状,根据磁流变胶的优点以及目前磁控电磁学特性研究的不足提出了本文的主要研究内容。(2)完成聚氨酯磁流变胶和预结构磁流变弹性体的制备,根据测试要求将磁流变胶封装成电阻,并建立了磁控电阻率和介电常数、磁导率测试系统。(3)对磁流变胶的磁控电阻特性进行了测试,研究并分析了铁粉含量、基体粘度和石墨添加对其磁控电阻率的影响;使用非均匀磁化的思想对磁流变胶的磁化曲线进行了理论计算,并进行了实验验证;根据偶极子理论和逾渗理论对磁流变胶的电导率与磁场强度和铁粉体积分数的关系进行了理论推导和数据拟合,取得较好的效果。(4)通过在聚氨酯磁流变弹性体制备过程中施加恒定磁场,将铁粉颗粒在磁场下的分布结构固化在固态基体中,测试了预结构磁场强度和方向对磁流变弹性体介电常数、磁导率和反射率损耗的影响,并对结果进行了初步的理论分析。最后总结了全文的研究工作,介绍了论文的特色和创新之处,并指出本文仍需进一步研究的问题。
[Abstract]:Magnetorheological material is a kind of magnetically controlled intelligent material, which is mainly composed of polymer matrix and micron magnetic particles. The distribution of magnetic particles and the magnetization of particles in magneto-rheological materials will be changed by the change of external magnetic field. Therefore, the electromagnetic properties of magneto-rheological materials can be changed continuously and inversely under the control of magnetic field, so that they can be changed in sensing devices and smart absorbing materials. Magnetic control electrical components, bionic skin and other fields have great development potential and application prospects. Due to the weak research on magnetron electromagnetic properties of magneto-rheological materials at present, the magnetoresistive properties of magneto-rheological adhesives and the dielectric constants of pre-structured magneto-rheological elastomers are studied by using polyurethane as the matrix, respectively. The permeability and absorbing property are studied. The specific work includes the following aspects: (1) the characteristics of different magnetorheological materials and the research status of magnetic-controlled electromagnetic properties of magneto-rheological materials at home and abroad are introduced. The main research contents of this paper are put forward according to the advantages of magnetorheological adhesives and the shortcomings of the current research on magnetic-controlled electromagnetic properties. (2) the preparation of polyurethane magnetorheological adhesives and pre-structured magnetorheological elastomers is completed. According to the test requirements, the magneto-rheological adhesive was encapsulated into a resistance, and a magnetic control resistivity, dielectric constant and permeability test system was established. (3) the magnetic-controlled resistance characteristics of the magnetorheological adhesive were tested, and the content of iron powder was studied and analyzed. The effect of matrix viscosity and graphite addition on magnetically controlled resistivity was studied, and the magnetization curve of magneto-rheological adhesive was calculated by using the idea of inhomogeneous magnetization, and was verified by experiments. Based on the dipole theory and percolation theory, the relationship between the electrical conductivity and the magnetic field strength and the volume fraction of iron powder is derived theoretically and the data are fitted. Good results were obtained. (4) the distribution structure of iron particles in the magnetic field was solidified in solid matrix by applying a constant magnetic field during the preparation of polyurethane magneto-rheological elastomer. The effects of the intensity and direction of prestructure magnetic field on the permittivity, permeability and reflectivity loss of the magneto-rheological elastomer were measured, and the results were preliminarily analyzed. Finally, this paper summarizes the research work, introduces the characteristics and innovations of the paper, and points out the problems that need further study.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB381
本文编号：2250145
[Abstract]:Magnetorheological material is a kind of magnetically controlled intelligent material, which is mainly composed of polymer matrix and micron magnetic particles. The distribution of magnetic particles and the magnetization of particles in magneto-rheological materials will be changed by the change of external magnetic field. Therefore, the electromagnetic properties of magneto-rheological materials can be changed continuously and inversely under the control of magnetic field, so that they can be changed in sensing devices and smart absorbing materials. Magnetic control electrical components, bionic skin and other fields have great development potential and application prospects. Due to the weak research on magnetron electromagnetic properties of magneto-rheological materials at present, the magnetoresistive properties of magneto-rheological adhesives and the dielectric constants of pre-structured magneto-rheological elastomers are studied by using polyurethane as the matrix, respectively. The permeability and absorbing property are studied. The specific work includes the following aspects: (1) the characteristics of different magnetorheological materials and the research status of magnetic-controlled electromagnetic properties of magneto-rheological materials at home and abroad are introduced. The main research contents of this paper are put forward according to the advantages of magnetorheological adhesives and the shortcomings of the current research on magnetic-controlled electromagnetic properties. (2) the preparation of polyurethane magnetorheological adhesives and pre-structured magnetorheological elastomers is completed. According to the test requirements, the magneto-rheological adhesive was encapsulated into a resistance, and a magnetic control resistivity, dielectric constant and permeability test system was established. (3) the magnetic-controlled resistance characteristics of the magnetorheological adhesive were tested, and the content of iron powder was studied and analyzed. The effect of matrix viscosity and graphite addition on magnetically controlled resistivity was studied, and the magnetization curve of magneto-rheological adhesive was calculated by using the idea of inhomogeneous magnetization, and was verified by experiments. Based on the dipole theory and percolation theory, the relationship between the electrical conductivity and the magnetic field strength and the volume fraction of iron powder is derived theoretically and the data are fitted. Good results were obtained. (4) the distribution structure of iron particles in the magnetic field was solidified in solid matrix by applying a constant magnetic field during the preparation of polyurethane magneto-rheological elastomer. The effects of the intensity and direction of prestructure magnetic field on the permittivity, permeability and reflectivity loss of the magneto-rheological elastomer were measured, and the results were preliminarily analyzed. Finally, this paper summarizes the research work, introduces the characteristics and innovations of the paper, and points out the problems that need further study.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB381
【参考文献】
相关硕士学位论文 前1条
1 孙新;羰基铁粉及其复合材料的电磁性能研究[D];南京航空航天大学;2013年
，本文编号：2250145
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