發(fā)布時(shí)間：2018-06-29 09:30

  本文選題：高頻無(wú)極燈 + NiCuZn鐵氧體��； 參考：《電子科技大學(xué)》2014年碩士論文

【摘要】：人造電光源發(fā)展迅速,現(xiàn)已進(jìn)入以高頻無(wú)極燈和發(fā)光二極管(Light Emitting Diode,LED)為代表的第四代綠色電光源時(shí)代。高頻無(wú)極燈具有發(fā)光效率高、使用壽命長(zhǎng)、顯色指數(shù)高、無(wú)頻閃、環(huán)保等優(yōu)點(diǎn),因此對(duì)節(jié)能降耗、用眼健康、綠色環(huán)保有重大意義。但目前由于高頻無(wú)極燈電磁耦合器使用的Ni系鐵氧體磁心居里溫度(Tc)較低、截止頻率(fr)低、高頻損耗(Pcv)溫度特性差、生產(chǎn)成本高等缺點(diǎn),致使高頻無(wú)極燈的推廣和普及面臨不小的困難。因此本文針對(duì)目前高頻無(wú)極燈用Ni系鐵氧體的缺點(diǎn),開(kāi)展了以下工作。采用少量Cu2+取代Ni2+,形成了Fe2O3、NiO、ZnO和CuO四元體系主配方,降低了燒結(jié)溫度,細(xì)化了晶粒,并使得Snoek乘積和電阻率提高。同時(shí)優(yōu)化主配方中的ZnO含量,確保樣品具有高Tc和高fr。當(dāng)ZnO含量從17mol%增加到24mol%時(shí),Tc從375℃逐漸下降到275℃;起始磁導(dǎo)率(μi)從99逐漸增大到236,fr從75MHz逐漸降低到26MHz;當(dāng)ZnO含量為18mol%時(shí),樣品的Pcv最低為714mW/cm3(3MHz,10mT,100℃)。在優(yōu)化后的NiCuZn主配方基礎(chǔ)上,分別采用微量Ta2O5和Co2O3摻雜。研究結(jié)果表明:Ta2O5具有細(xì)化NiCuZn鐵氧體晶粒的作用,可降低材料的燒結(jié)密度。隨著Ta2O5添加量的增加,樣品的飽和磁感應(yīng)強(qiáng)度(Bs)和μi單調(diào)減小,矯頑力(Hc)則逐漸增大,fr逐漸升高,而Pcv呈先降低后增加的趨勢(shì),其主導(dǎo)因素由剩余損耗(Pr)逐漸過(guò)渡到磁滯損耗(Ph)。當(dāng)Ta2O5添加量為0.12wt%時(shí),樣品在3MHz,10mT,100℃下總損耗最小,為139m W/cm3,其中Ph和Pr分別為93mW/cm3和46mW/cm3。Co2O3的添加量在0~1.00wt%的變化范圍內(nèi),樣品的平均晶粒尺寸略有減小,μi逐漸下降,fr逐漸升高。在3MHz,10mT,25~140℃條件下,隨著Co2O3添加量的增加,磁心損耗單調(diào)減小。采用適量MgO取代價(jià)格昂貴的NiO,降低了磁心成本。隨著MgO含量的增加,燒結(jié)密度逐漸降低,Tc近似呈線(xiàn)性下降,從362℃逐漸下降到291℃;μi有一定程度下降,fr變化不大;Pcv也無(wú)顯著變化,當(dāng)MgO含量為8mol%時(shí),Pcv在各個(gè)溫度點(diǎn)下相對(duì)較低。在優(yōu)化后的NiMgCuZn主配方中采用Ta2O5和Co2O3復(fù)合添加,制備的樣品晶粒尺寸較小且均勻;隨著Ta2O5和Co2O3添加量的增加,μi逐漸降低,fr逐漸升高;當(dāng)Ta2O5和Co2O3的添加量分別為0.50wt%和0.36wt%時(shí),樣品在3MHz,10mT,100℃下的損耗最低,僅為25mW/cm3。通過(guò)以上工作制備了NiCuZn和NiMgCuZn兩種鐵氧體磁心,其性能參數(shù)均達(dá)到了高頻無(wú)極燈的適用標(biāo)準(zhǔn),其中NiMgCuZn鐵氧體大大降低了高頻無(wú)極燈磁心的成本。采用本文制備的兩種磁心繞制了電磁耦合器,并成功點(diǎn)亮了高頻無(wú)極燈。
[Abstract]:With the rapid development of artificial electric light source, it has entered the fourth generation green electric light source era represented by high frequency electrodeless lamp and light emitting diode (LED). High frequency electrodeless lamps have the advantages of high luminous efficiency, long service life, high color index, no stroboscopic, environmental protection and so on. Therefore, it is of great significance to save energy and reduce consumption, eye health and green environmental protection. However, due to the low Curie temperature (Tc) of Ni ferrite core, low cut-off frequency (fr), low temperature characteristic of high frequency loss (PcV), high production cost and so on, the electromagnetic coupler of high frequency electrodeless lamp has many disadvantages, such as low Curie temperature (Tc), low cut-off frequency (fr), high production cost and so on. As a result, the promotion and popularization of high frequency pole-less lamps are faced with great difficulties. Therefore, in view of the shortcomings of Ni ferrite used in high frequency electrodeless lamps, the following work has been carried out in this paper. A small amount of Cu _ 2 was used to replace Ni _ 2 to form the main formula of Fe _ 2O _ 3 / nio _ (ZnO) and CuO quaternary systems. The sintering temperature was reduced, the grain size was refined, and the Snoek product and resistivity were increased. At the same time, the content of ZnO in the main formula is optimized to ensure that the sample has high Tc and high fr. When ZnO content increased from 17 mol% to 24 mol%, Tc decreased gradually from 375 鈩，

本文編號(hào)：2081674