本文關(guān)鍵詞： NiCuZn鐵氧體 磁導(dǎo)率 低溫?zé)Y(jié) 助熔劑 磁性能　出處：《電子科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：為在低溫?zé)Y(jié)下得到性能優(yōu)良的NiCuZn鐵氧體材料,本文在NiCuZn鐵氧體材料主配方確定的基礎(chǔ)上,進(jìn)行助熔劑摻雜,分別進(jìn)行了V2O5、Bi2O3、WO3單一摻雜以及Bi2O3-V2O5、Bi2O3-WO3復(fù)合摻雜,采用氧化物燒結(jié)法制備,調(diào)節(jié)工藝,進(jìn)行適量摻雜,在13.56MHz制備出性能優(yōu)良的低溫?zé)Y(jié)NiCuZn鐵氧體材料,同時(shí),對(duì)比分析了不同助熔劑對(duì)于NiCuZn鐵氧體材料微觀結(jié)構(gòu)及磁性能的影響。在理論方面,本文對(duì)NiCuZn鐵氧體的晶體結(jié)構(gòu)、離子分布、超交換作用等基礎(chǔ)理論進(jìn)行闡述,其次對(duì)NiCuZn鐵氧體的磁導(dǎo)率、截止頻率等重要磁參數(shù)進(jìn)行了描述,最后針對(duì)NiCuZn鐵氧體燒結(jié)特性以及低溫?zé)Y(jié)的意義進(jìn)行了分析與闡述。通過在二次球磨前分別加入V2O5、Bi2O3,實(shí)現(xiàn)了950℃下的低溫?zé)Y(jié),得到了性能良好的鐵氧體材料。加入不同含量的V2O5與Bi2O3,磁導(dǎo)率變化規(guī)律均為先升高后降低,這表明液相助燒機(jī)制可以降低燒結(jié)溫度,但是隨著助熔劑含量的繼續(xù)升高,反而產(chǎn)生了晶粒生長異常,氣泡增多,導(dǎo)致了性能下降。其中,加入Bi2O3得到了低溫?zé)Y(jié)高導(dǎo)低損的鐵氧體材料,加入V2O5得到了低溫?zé)Y(jié)高導(dǎo)高損的鐵氧體材料。隨后進(jìn)行了WO3的摻雜,實(shí)驗(yàn)結(jié)果表明,WO3的加入不能降低本實(shí)驗(yàn)配方的樣品燒結(jié)溫度,對(duì)于晶粒生長有一定的抑制作用,材料樣品的磁導(dǎo)率實(shí)部虛部均有所降低,但對(duì)品質(zhì)因數(shù)Q值有明顯的提高作用。結(jié)合單一摻雜助燒性能,進(jìn)行了Bi2O3-V2O5、Bi2O3-WO3復(fù)合摻雜,結(jié)果表明,在摻雜Bi2O3含量不變的基礎(chǔ)上,進(jìn)行V2O5的摻雜,會(huì)導(dǎo)致樣品磁導(dǎo)率實(shí)部虛部均有所升高,而在Bi2O3含量不變的基礎(chǔ)上加入WO3,樣品品質(zhì)因數(shù)Q有所提高,但是磁導(dǎo)率明顯降低。為進(jìn)一步改善產(chǎn)品性能,對(duì)球磨時(shí)間、預(yù)燒溫度和燒結(jié)溫度對(duì)材料性能的影響進(jìn)行了分析研究。隨著球磨時(shí)間、預(yù)燒溫度和燒結(jié)溫度的增加,樣品的磁導(dǎo)率均呈現(xiàn)先升高后降低的變化規(guī)律。球磨時(shí)間升高使材料破碎越來越均勻細(xì)致,提高了燒結(jié)活性,但是之后性能的降低則是由于過久的球磨導(dǎo)致雜質(zhì)鐵的引入,改變了配方結(jié)構(gòu)。隨著預(yù)燒溫度升高,晶粒初步生長,晶格缺陷得以修正,但會(huì)降低燒結(jié)活性。而燒結(jié)溫度的過度升高,會(huì)引起晶粒異常生長,氣泡增多,反而不利于性能提高。
[Abstract]:In order to obtain NiCuZn ferrite materials with excellent properties under low temperature sintering, on the basis of the determination of the main formula of NiCuZn ferrite materials, the fluxes were doped, the single doping of V _ 2O _ 5 and Bi _ 2O _ 3O _ 3 and the composite doping of Bi _ 2O _ 3-V _ 2O _ 5 and Bi _ 2O _ 3-WO3 were prepared by oxide sintering method. The low temperature sintered NiCuZn ferrite materials with excellent properties were prepared by adjusting the process and doping at 13.56MHz. At the same time, the effects of different fluxes on the microstructure and magnetic properties of NiCuZn ferrite materials were compared and analyzed. In this paper, the basic theory of crystal structure, ion distribution and superexchange interaction of NiCuZn ferrite is described. Secondly, the important magnetic parameters such as permeability and cut-off frequency of NiCuZn ferrite are described. Finally, the sintering characteristics of NiCuZn ferrite and the significance of low temperature sintering are analyzed and expounded. By adding V _ 2O _ 5 and Bi _ 2O _ 3 respectively before secondary ball milling, the low temperature sintering at 950 鈩，

本文編號(hào)：1539839