本文關(guān)鍵詞：納米粉對(duì)燒結(jié)釹鐵硼抗腐蝕性能的影響　出處：《沈陽(yáng)工業(yè)大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 燒結(jié)NdFeB Mg納米粉 磁性能 抗腐蝕性能

【摘要】：燒結(jié)NdFeB磁體卓越的磁性能而被廣泛的應(yīng)用在各種電子設(shè)備中。但是,由于NdFeB磁體富Nd相與主相之間大的電位差使磁體容易發(fā)生晶間腐蝕,富Nd相比較活潑,在濕熱環(huán)境中與H2O反應(yīng)造成晶界區(qū)域體積膨脹產(chǎn)生晶界應(yīng)力,導(dǎo)致晶界相破壞。這些原因的存在嚴(yán)重限制了燒結(jié)NdFeB在重要領(lǐng)域中的應(yīng)用,晶界相的微觀結(jié)構(gòu)與NdFeB磁體的腐蝕性能密切相關(guān)。目前,通過(guò)晶界添加改變晶界相的結(jié)構(gòu)是一種有效的改善燒結(jié)NdFeB磁體抗腐蝕性能的方法之一。本文為了提高燒結(jié)釹鐵硼磁體的磁性能和抗腐蝕性能,采用二元合金法添加Mg納米粉制備N(xiāo)dFeB材料。利用掃描電子顯微鏡、X射線(xiàn)衍射儀和AMT-4永磁特性測(cè)試儀對(duì)燒結(jié)NdFeB磁體(PrNd)29.9Dy0.1B1Co1Cu0.15Febal+x%Mg(質(zhì)量分?jǐn)?shù)))的微觀結(jié)構(gòu)和磁性能進(jìn)行了分析。添加Mg納米粉的量分別為0.0wt.%、0.1wt.%、0.2wt.%、0.3wt.%和0.4wt.%。結(jié)果表明:當(dāng)添加了0.1wt%Mg納米粉時(shí),嬌頑力(Hcj)達(dá)到最大值999.1kA/m,剩磁(Br)達(dá)到最大值1.436T,最大磁能積(BH)max達(dá)到最大值396.9kJ/m3,磁體密度為7.42g/cm3,增加了0.27%。磁性能的提高與晶界的微觀結(jié)構(gòu)和磁體密度的改變密切相關(guān)。采用電化學(xué)工作站和加速腐蝕試驗(yàn)對(duì)燒結(jié)NdFeB磁體的抗腐蝕性能進(jìn)行檢測(cè),動(dòng)電位極化曲線(xiàn)分別在3.5%NaCl和0.005%H2SO4溶液中測(cè)得,曲線(xiàn)平臺(tái)對(duì)應(yīng)的縱坐標(biāo)為相應(yīng)的腐蝕電位,陽(yáng)極曲線(xiàn)的切線(xiàn)與自腐蝕電位的交點(diǎn)的橫坐標(biāo)為相應(yīng)的腐蝕電流密度。在酸性腐蝕介質(zhì)中,當(dāng)Mg添加量從0.0wt.%增加到0.4wt.%,腐蝕電位由-0.618V升高到-0.470V,腐蝕電流密度由193.1μA/cm~2降低到46.5μA/cm~2。在濕熱環(huán)境中腐蝕96h后,添加0.0wt.%和0.1wt.%Mg的磁體的質(zhì)量損失分別為42.3 mg/cm~2和5.3 mg/cm~2,表明晶界添加Mg納米粉能夠提高磁體的抗腐蝕性能。進(jìn)一步的研究表明磁體抗腐蝕性能的提高與Mg-Nd晶界相的形成有關(guān)。
[Abstract]:Sintered NdFeB magnets have been widely used in various electronic devices due to their excellent magnetic properties. However, due to the large potential difference between Nd-rich and main phases of NdFeB magnets, the magnets are prone to intergranular corrosion. Nd-rich phase is relatively active, and the volume expansion of grain boundary region results in grain boundary stress due to the reaction with H _ 2O in humid and thermal environment. These reasons seriously limit the application of sintered NdFeB in important fields. The microstructure of grain boundary phase is closely related to the corrosion properties of NdFeB magnets. It is one of the effective ways to improve the corrosion resistance of sintered NdFeB magnets by adding grain boundary to change the structure of grain boundary phase. In order to improve the magnetic properties and corrosion resistance of sintered NdFeB magnets. The NdFeB material was prepared by adding mg nano-powder by binary alloy method. Scanning electron microscope (SEM) was used. X-ray diffractometer and AMT-4 permanent Magnet characteristic Tester for Sintered NdFeB Magnet PrNdlr 29.9Dy0.1B1Co1Cu0.15Febal xMg(. The content of mg nano-powder was 0.0wt.%. 0.3wt.% and 0.4wt.s. the results showed that when 0.1 wtmg nano-powder was added. The maximum value of coercive force (HCJ) is 999.1 Ka / m, the maximum value of remanent magnetic energy is 1.436 T, and the maximum value of BHN max is 396.9 KJ / m3. The density of magnets is 7.42 g / cm3. The improvement of magnetic properties is closely related to the change of grain boundary microstructure and density of magnets. The corrosion resistance of sintered NdFeB magnets was tested by electrochemical workstation and accelerated corrosion test. Test. The potential polarization curves were measured in 3.5 NaCl and 0.005H _ 2SO _ 4 solutions, respectively. The corresponding vertical coordinates of the curve platform are the corresponding corrosion potentials. The transverse coordinates of the tangent line of the anode curve and the intersection point of the self-etching potential are the corresponding corrosion current density. In acidic corrosion medium, the mg content increases from 0.0wt.% to 0.4wt.%. The corrosion potential increased from -0.618 V to -0.470 V, and the corrosion current density decreased from 193.1 渭 A / cm ~ (2) to 46.5 渭 A / cm ~ (2). The mass loss of magnets added 0.0wt.% and 0.1wt.mg were 42.3 mg/cm~2 and 5.3 mg/cm~2, respectively. The results show that the corrosion resistance of magnets can be improved by adding mg nano-powder to grain boundary, and the further research shows that the improvement of corrosion resistance of magnets is related to the formation of Mg-Nd grain boundary phase.
【學(xué)位授予單位】：沈陽(yáng)工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TM273

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