本文關(guān)鍵詞：PVDF基磁電復(fù)合材料及其改性機(jī)理研究　出處：《華中科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 顆粒復(fù)合 誘導(dǎo)磁場(chǎng) 微結(jié)構(gòu)調(diào)控 結(jié)構(gòu)設(shè)計(jì) 層狀結(jié)構(gòu)

【摘要】：磁電復(fù)合材料因具有磁電轉(zhuǎn)換功能而廣泛應(yīng)用在濾波器、磁場(chǎng)傳感器、換能器、信息存儲(chǔ)器等方面,目前已成為鐵電、鐵磁功能材料領(lǐng)域研究的熱點(diǎn)。本文以聚偏氟乙烯PVDF基磁電復(fù)合材料為研究對(duì)象,采用微結(jié)構(gòu)磁場(chǎng)調(diào)控和結(jié)構(gòu)改進(jìn)兩種方法來提升材料的磁電轉(zhuǎn)換性能。本文工作對(duì)磁場(chǎng)調(diào)控磁電復(fù)合材料磁電性能的研究及高性能柔性磁電復(fù)合材料的制備具有較好的指導(dǎo)意義。本文首先研究了聚偏氟乙烯PVDF、鋯鈦酸鉛PZT和稀土鐵合金Terfenol-D(TD)三相顆粒磁電復(fù)合材料中各相含量與復(fù)合材料電學(xué)性能的關(guān)系�？紤]材料的柔韌性及電學(xué)性能,當(dāng)PVDF與PZT體積比為3:7時(shí),PVDF/PZT復(fù)合材料的綜合性能最佳。在此基礎(chǔ)上,添加不同含量的磁致伸縮相材料TD并進(jìn)行磁電轉(zhuǎn)換性能測(cè)量,實(shí)驗(yàn)結(jié)果顯示,三相磁電復(fù)合材料的磁電轉(zhuǎn)換性能隨著TD含量的增加先增大后減小,這是由過低TD導(dǎo)致的磁致伸縮性能差和過高TD導(dǎo)致的滲流而降低壓電性能引起的,當(dāng)TD含量在7vol%時(shí)PVDF/PZT/TD復(fù)合材料的磁電轉(zhuǎn)換系數(shù)達(dá)到58mV·cm-1·Oe-1。在磁電復(fù)合材料微結(jié)構(gòu)磁場(chǎng)調(diào)控方面,本文采用溶液混合和熱壓成型工藝相結(jié)合,通過在熱壓成型過程中施加不同大小的誘導(dǎo)磁場(chǎng),制備了PVDF/PZT/TD顆粒磁電復(fù)合材料。通過對(duì)磁電復(fù)合材料的壓電性能、介電性能以及磁電轉(zhuǎn)換性能進(jìn)行分析,探究了誘導(dǎo)磁場(chǎng)對(duì)PVDF/PZT/TD顆粒磁電復(fù)合材料電學(xué)性能的影響。實(shí)驗(yàn)結(jié)果表明,磁電材料的磁電轉(zhuǎn)換系數(shù)隨著誘導(dǎo)磁場(chǎng)的增加先變大后減小,這是因?yàn)檩^小誘導(dǎo)磁場(chǎng)能有效提升材料磁致伸縮性能,而較大磁場(chǎng)在提升磁致伸縮性能的同時(shí)會(huì)較大程度上降低不同功能相間的耦合度從而降低磁電轉(zhuǎn)換性能。磁電復(fù)合材料的磁電轉(zhuǎn)換系數(shù)在誘導(dǎo)磁場(chǎng)200Oe附近時(shí)達(dá)到最大值82.5mV·cm-1·Oe-1,比無(wú)誘導(dǎo)磁場(chǎng)作用下的PVDF/PZT/TD顆粒磁電復(fù)合材料提高了40%以上。在結(jié)構(gòu)改進(jìn)方面,為了克服顆粒磁電材料中TD含量低的問題,本文制備了三層結(jié)構(gòu)的層狀磁電復(fù)合材料。根據(jù)相關(guān)理論分析,把壓電層PVDF+PZT作為中間層,磁致伸縮層PVDF+TD作為兩邊層;為了得到性能最佳的層狀磁電復(fù)合材料,研究了不同的層厚比對(duì)材料各項(xiàng)性能的影響,結(jié)果顯示,當(dāng)PVDF+TD、PVDF+PZT、PVDF+TD三層的層厚比為1:1.5:1時(shí),該三層結(jié)構(gòu)材料的磁電轉(zhuǎn)換系數(shù)達(dá)到最大值2576.2 mV·cm-1·Oe-1,比PVDF/PZT/TD顆粒磁電復(fù)合材料增加了44倍左右。0-3型PVDF基磁電復(fù)合材料在柔韌性、抗老化、抗腐蝕、高頻性能和抗渦流能力等方面優(yōu)勢(shì)明顯,但其低磁電性能制約著該類材料應(yīng)用的進(jìn)一步推廣。誘導(dǎo)磁場(chǎng)對(duì)磁電復(fù)合材料的磁電性能具有較好的提升作用,磁電復(fù)合材料的結(jié)構(gòu)模式對(duì)磁電性能有著較大的影響,采用微結(jié)構(gòu)磁場(chǎng)調(diào)控和結(jié)構(gòu)改進(jìn)的方法有利于促進(jìn)柔性磁電復(fù)合材料實(shí)際應(yīng)用的推廣。
[Abstract]:Magnetoelectric composites with magnetoelectric conversion function which is widely used in filter, magnetic field sensor, transducer, information storage and so on, has become the hot research of ferroelectric and ferromagnetic functional materials. In this paper, polyvinylidene fluoride PVDF based magnetoelectric composite materials as the research object, using the micro structure of magnetic field and structure improvement of two methods to improve the material performance. This paper studies magnetoelectric conversion of magnetic field control of magnetoelectric composite magnetoelectric properties and high performance flexible magnetoelectric composite material preparation has good significance. This paper studies the polyvinylidene fluoride PVDF, lead zirconate titanate PZT and rare earth iron alloy Terfenol-D (TD) three-phase magnetoelectric composite particles the material in each phase content and the electrical properties of the composites. The flexibility and electrical properties of the material in the PVDF and PZT, when the volume ratio of 3:7, PVDF/PZT composite material synthesis Optimal performance. On this basis, the magnetostrictive phase materials with different content of TD and magnetoelectric conversion performance measurement, the experimental results show that the three-phase magnetoelectric composite magnetoelectric conversion performance with the increase of TD content increases first and then decreases, which is caused by the low seepage TD magnetostrictive properties and high difference caused by TD while reducing the pressure caused by the electrical properties, when the content of TD in the 7vol% PVDF/PZT/TD magnetoelectric composite conversion coefficient reached 58mV - cm-1 - Oe-1. in magnetoelectric composite micro structure magnetic field regulation, this paper adopts solution mixing and hot pressing forming technology combined by magnetic field induced by applying different size in the hot pressing process, PVDF/PZT/TD particles magnetoelectric composites were prepared. The magnetoelectric composite piezoelectric properties, dielectric properties and analysis of magnetoelectric conversion performance, explores the induced magnetic field on PVDF/PZT/TD The effect of particle magnetoelectric composite electrical properties. The experimental results show that the magnetoelectric magnetoelectric materials with increasing magnetic field induced conversion coefficient first increases and then decreases, this is because the smaller the induced magnetic field can effectively enhance the magnetostrictive properties of materials, and the larger magnetic field will greatly reduce the degree of coupling between different functions so as to reduce the magnetoelectric conversion performance in at the same time enhance the magnetostriction properties. The magnetoelectric magnetoelectric composite conversion coefficient reaches the maximum value of 82.5mV - cm-1 - Oe-1 in the induced magnetic field near 200Oe, than PVDF/PZT/TD induced magnetoelectric composite particles under magnetic field is improved by more than 40%. The improvement in the structure, in order to overcome the low content of TD particles in the magnetoelectric materials problems. The layered magnetoelectric composite three layer structure was prepared in this paper. According to the theory analysis, the piezoelectric layer PVDF+PZT as the middle layer, the magnetostrictive layer PVDF+T D as both layers; in order to get the best performance of the layered magnetoelectric composites, of different thickness ratio on the properties of the materials, results showed that when PVDF+TD, PVDF+PZT, PVDF+TD three layer thickness ratio 1:1.5:1, the three layer structure material magnetoelectric conversion coefficient reaches the maximum value of 2576.2 mV cm-1. Oe-1, PVDF/PZT/TD particles than magnetoelectric composites increased about 44 fold.0-3 PVDF based magnetoelectric composites in flexibility, aging resistance, corrosion resistance, high performance and anti vortex ability has obvious advantages, but its low magnetoelectric properties restricts the further application of this kind of materials. The magnetoelectric properties of the induced magnetic field of magnetoelectric composites has a good promotion effect, the structure model of magnetoelectric composite materials has great influence on the magnetoelectric properties through micro magnetic field structure regulation and improved structure is conducive to the promotion of soft magnetic composite The promotion of the practical application of the material.

【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB33

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