本文關(guān)鍵詞： FeSiAlTi合金 反射損耗 電磁性能 球磨 包覆　出處：《西華大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：進(jìn)入21世紀(jì),科技進(jìn)入到了一個(gè)爆發(fā)式增長的時(shí)代,在帶來便利的同時(shí)也帶來了一些麻煩。隨著電子設(shè)備的普及,產(chǎn)生電磁波量的增加,電磁波對電子設(shè)備和生物產(chǎn)生的影響將不容忽視。目前針對此問題的解決方法主要是使用吸波材料來對電磁波進(jìn)行衰減。金屬合金粉體吸波材料有著比鐵氧體更高的飽和磁化強(qiáng)度,更寬的吸收頻段,吸波性能更好。FeSiAl合金粉體具有高磁導(dǎo)率,高飽和磁化強(qiáng)度,高電阻率,適用頻帶寬,吸波性能好的優(yōu)點(diǎn)。Ti可以增加材料的電阻率,減小渦流損耗,進(jìn)而提高磁導(dǎo)率。本文通過機(jī)械合金化和熔煉加球磨兩種方法制備了FeSiAlTi合金粉體,研究了兩種不同的制備工藝和不同的Ti含量對粉體結(jié)構(gòu)和吸波性能的影響。在此基礎(chǔ)上,用MgO通過高能球磨和蒸鍍兩種方法包覆在FeSiAlTi表面,進(jìn)行了改性的研究。機(jī)械合金化方法制備的FeSiAlTi片狀粉體,球磨50h,粉體粒度達(dá)到幾個(gè)μm,當(dāng)Ti含量為3.6wt%時(shí),介電常數(shù)最低,反射損耗達(dá)到了最小值-30.95d B。用熔煉,球磨的方法制備FeSiAlTi片狀合金粉體,球磨40h,隨著合金中Ti含量的增加,晶格常數(shù)先變大,后變小,最后和沒加Ti時(shí)一樣。根據(jù)原子大小分析,隨著Ti含量的增加,Ti在合金中將會(huì)取代Al的位置,當(dāng)Ti含量為1at%和1.5at%時(shí),合金粉體中出現(xiàn)了一種新相Fe0.975Ti0.025。Ti含量為1at%的粉體各原子間有合適的間距和配比,介電常數(shù)和磁導(dǎo)率取得了很好的匹配關(guān)系,最小反射損耗達(dá)到了-21.13dB。通過高能球磨在粉體表面包覆MgO,由于MgO沒有很好包覆在粉體表面,粉體介電常數(shù)變大,吸波性能變差,反射損耗峰值移向低頻。在FeSiAlTi粉體表面氧化后,通過蒸鍍的方式,讓Mg粉和表面氧化物在高溫下發(fā)生反應(yīng),在粉體表面包覆MgO膜,品質(zhì)因數(shù)Q隨著頻率的增加增加,??具有良好的頻率穩(wěn)定性,在Ti含量為1.5at%時(shí),具有最大??。用機(jī)械合金化方法制備FeSiAlTi合金粉體時(shí),球磨50h,Ti的含量為3.6wt%時(shí),粉體的阻抗匹配關(guān)系最好,吸波性能最好。使用熔煉加球磨的方法制備FeSiAlTi合金時(shí),Ti含量為1at%時(shí)可以使粉體取得最好的吸波性能。
[Abstract]:In 21th century, technology entered an era of explosive growth, bringing convenience as well as some trouble. With the popularity of electronic equipment, the amount of electromagnetic waves increased. The influence of electromagnetic wave on electronic equipment and biology will not be ignored. At present, the main solution to this problem is to use absorbing material to attenuate electromagnetic wave. Metal alloy powder absorber has more than ferrite. High saturation magnetization. With wider absorption band, the properties of FeSiAl alloy powder are better. FeSiAl alloy powder has high permeability, high saturation magnetization, high resistivity and suitable frequency bandwidth. The advantages of good absorbing property. Ti can increase the resistivity of the material and reduce the eddy current loss. In this paper, FeSiAlTi alloy powder was prepared by mechanical alloying and smelting and ball milling. The effects of two different preparation processes and different Ti content on the structure and microwave absorption properties of the powders were studied. MgO was coated on the surface of FeSiAlTi by high energy ball milling and evaporation plating. The FeSiAlTi flake powder prepared by mechanical alloying was milled for 50 h. When Ti content is 3.6 wt%, the dielectric constant is the lowest and the reflection loss reaches the minimum value of -30.95dB. The FeSiAlTi flake alloy powder was prepared by ball milling. With the increase of Ti content in the alloy, the lattice constant increased firstly and then decreased. Finally, as when Ti is not added, according to the atomic size analysis, with the increase of Ti content, Ti will replace Al in the alloy, when Ti content is 1at% and 1.5at%. A new phase with Fe0.975Ti0.025.Ti content of 1 at% was found in the alloy powder with proper spacing and proportion. The dielectric constant and permeability are well matched, and the minimum reflection loss is -21.13 dB. MgO is coated on the surface of the powder by high energy ball milling. Because MgO is not well coated on the surface of the powder, the dielectric constant of the powder becomes larger, the absorbing property becomes worse, the peak value of reflection loss shifts to the low frequency. After oxidation on the surface of the FeSiAlTi powder, the powder is deposited by evaporation. When mg powder and surface oxide react at high temperature and MgO film is coated on the surface of the powder, the quality factor Q increases with the increase of frequency. ? It has good frequency stability. When Ti content is 1.5 at%, it has the maximum frequency stability. ? When the mechanical alloying method was used to prepare FeSiAlTi alloy powder, the impedance matching relationship of the powder was the best when the content of Ti in 50 h ball milling was 3.6 wt%. When the content of Ti in FeSiAlTi alloy is 1 at%, the best absorbing property can be obtained.
【學(xué)位授予單位】：西華大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB383.3

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