【摘要】：磁流變材料是一種磁控智能材料,主要由高分子聚合物基體和微米級磁性顆粒組成。磁流變材料內(nèi)部磁性顆粒分布和顆粒的磁化強(qiáng)度都會因外加磁場的變化而發(fā)生改變,因而其電磁學(xué)特性可以在磁場控制下發(fā)生連續(xù)可逆變化,使其在傳感器件、智能吸波材料、磁控電學(xué)元件、仿生皮膚等領(lǐng)域都具有很大的發(fā)展?jié)摿蛻?yīng)用前景。由于目前磁流變材料磁控電磁學(xué)特性研究還很薄弱,本文以聚氨酯材料為基體,分別對磁流變膠的磁控電阻特性和預(yù)結(jié)構(gòu)磁流變彈性體的介電常數(shù)、磁導(dǎo)率和吸波性能進(jìn)行了研究。具體工作包括以下幾個方面:(1)介紹了不同磁流變材料的特點(diǎn)以及磁流變材料磁控電磁學(xué)特性研究的國內(nèi)外現(xiàn)狀,根據(jù)磁流變膠的優(yōu)點(diǎn)以及目前磁控電磁學(xué)特性研究的不足提出了本文的主要研究內(nèi)容。(2)完成聚氨酯磁流變膠和預(yù)結(jié)構(gòu)磁流變彈性體的制備,根據(jù)測試要求將磁流變膠封裝成電阻,并建立了磁控電阻率和介電常數(shù)、磁導(dǎo)率測試系統(tǒng)。(3)對磁流變膠的磁控電阻特性進(jìn)行了測試,研究并分析了鐵粉含量、基體粘度和石墨添加對其磁控電阻率的影響;使用非均勻磁化的思想對磁流變膠的磁化曲線進(jìn)行了理論計(jì)算,并進(jìn)行了實(shí)驗(yàn)驗(yàn)證;根據(jù)偶極子理論和逾滲理論對磁流變膠的電導(dǎo)率與磁場強(qiáng)度和鐵粉體積分?jǐn)?shù)的關(guān)系進(jìn)行了理論推導(dǎo)和數(shù)據(jù)擬合,取得較好的效果。(4)通過在聚氨酯磁流變彈性體制備過程中施加恒定磁場,將鐵粉顆粒在磁場下的分布結(jié)構(gòu)固化在固態(tài)基體中,測試了預(yù)結(jié)構(gòu)磁場強(qiáng)度和方向?qū)Υ帕髯儚椥泽w介電常數(shù)、磁導(dǎo)率和反射率損耗的影響,并對結(jié)果進(jìn)行了初步的理論分析。最后總結(jié)了全文的研究工作,介紹了論文的特色和創(chuàng)新之處,并指出本文仍需進(jìn)一步研究的問題。
[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.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB381

【參考文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 孫新;羰基鐵粉及其復(fù)合材料的電磁性能研究[D];南京航空航天大學(xué);2013年

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本文編號：2250145