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北京石油化工學(xué)院2026年研究生招生接收調(diào)劑公告

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wanghaiju

金蟲 (正式寫手)

應(yīng)助: 2 (幼兒園)
金幣: 620.2
散金: 100
紅花: 1
帖子: 358
在線: 85.6小時(shí)
蟲號(hào): 1047538
注冊(cè): 2010-06-25
性別: MM
專業(yè): 應(yīng)用有機(jī)化學(xué)

[求助] 高分子材料論文翻譯求助

Electromagnetic interference (EMI) has become a
specific type of environmental pollution, due to the
rapid growth in utilization of electrical and electronic
devices in industrial, commercial and military applica-
tions. Electromagnetic attenuation materials have been
commonly used to minimize EMI. M-type barium
ferrite is an ideal material for the development of
electromagnetic attenuation at microwave band, due to
the high saturation magnetization, large anisotropy
field, excellent chemical stability and high microwave
magnetic loss [1–3]. In order to improve the magnetic
and electromagnetic absorption properties of ferrites,
some Fe3+ions have been substituted with Co–Ti, Zn–
Ti, Zn–Sn, Co–Sn, Ni–Zr and Co–Mo [4–9]. In another
way, ferrites have been compounded with nonmagnetic
materials such as SiO2, Bi2O3and Al2O3[10–15]. In
our previous work, the microwave absorption proper-
ties of a series of barium ferrites substituted with Al3+
and Cr3+were studied [16]. We found that the locations
of absorption peaks for the barium ferrites change
regularly with the amount of substitution ions. We also
compounded BaFe12O19with TiO2when preparing the
film, which not only eliminates the microcracks in film,
but also improves its microwave absorption property.
Based on these results, we suggested in this paper a
method to broaden the absorption range of a film with
different layers. BaFe10.5Al1.5O19, BaFe10.1Al1.9O19
and BaFe11.4Cr0.6O19, having absorption peaks at
different frequencies, are selected with TiO2 to
prepare individual layers in the NCMF. In this way
the absorption range of the NCMF can be broadened.
The morphology, crystalline structure and microwave
absorption property of NCMF are studied.

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1樓 2014-04-08 23:46:30

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肚而家

木蟲 (小有名氣)

翻譯EPI: 21
應(yīng)助: 44 (小學(xué)生)
金幣: 1927.2
散金: 500
紅花: 10
帖子: 289
在線: 89.6小時(shí)
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注冊(cè): 2014-01-11
性別: GG
專業(yè): 有機(jī)化學(xué)

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RXMCDM: 金幣+1, 多謝應(yīng)助！ 2014-04-09 09:52:26
wanghaiju: 金幣+40, 翻譯EPI+1, ★★★★★最佳答案 2014-04-09 10:46:24

由于電子電氣設(shè)備的使用率在工商業(yè)和軍事領(lǐng)域的迅速增長，電磁干擾（EMI）現(xiàn)今已成為一種環(huán)境污染類型。電磁衰減材料已廣泛用于減少電磁干擾。M型鋇鐵氧體有高飽和磁化強(qiáng)度、大各向異性場、優(yōu)異的化學(xué)穩(wěn)定性和高微波磁損等性質(zhì)，是一種研發(fā)微波波段電磁衰減的理想材料。為了提高鐵氧體的磁性和電磁吸收性能，其中的一些三價(jià)鐵離子被Co–Ti, Zn–Ti, Zn–Sn, Co–Sn, Ni–Zr和Co–Mo等代替。另一種方式是把鐵氧體與其他非磁性物質(zhì)混合，比如SiO2,Bi2O3和Al2O3。我們?cè)谥暗墓ぷ髦醒芯苛艘幌盗蠥l3+和Cr3+離子替換鋇鐵氧體的微波吸收性能。我們發(fā)現(xiàn)鋇鐵氧體的吸收峰的位置隨著替換離子的量呈現(xiàn)有規(guī)律的變化。我們同樣也在制備薄膜時(shí)把BaFe12O19和TiO2混合，這種方法不僅消除了薄膜中的微裂紋，還提高了其微波吸收性能�；谶@些結(jié)果，我們?cè)谶@片文章中介紹一種使多層薄膜吸收范圍變寬的方法。BaFe10.5Al1.5O19, BaFe10.1Al1.9O19和BaFe11.4Cr0.6O19，這些具有不同吸收峰頻率的材料被選來與TiO2一起在NCMF中制備獨(dú)立層。如此這般NCMF的吸收范圍可以被擴(kuò)大。我們研究了NCMF的形貌、晶體結(jié)構(gòu)和微波吸收性能。

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2樓2014-04-09 09:45:22