發(fā)布時間：2018-05-03 17:23

  本文選題：紅外輻射 + 尖晶石　； 參考：《南京理工大學(xué)》2015年碩士論文

【摘要】：本文主要研究尖晶石型鐵氧體材料,其用于大功率LED散熱方向,該材料為新型無機非金屬材料,由鐵及其它一種或多種金屬組成復(fù)合氧化物。因其為尖晶石結(jié)構(gòu),不同價態(tài)陽離子占據(jù)晶體四面體或八面體位置,形成不同類型尖晶石結(jié)構(gòu)的復(fù)合物,使鐵氧體材料具有良好的電、磁、光等性能。研究表明,尖晶石型鐵氧體材料在紅外波段具有良好的輻射性能,且可以通過離子部分取代形成混合型結(jié)構(gòu),改善其紅外輻射性能。本文以MgFe2O4為研究對象,采用不同制備工藝、離子摻雜,并通過X射線衍射(XRD)、傅立葉紅外光譜儀(FT-IR)、粉末粒度、掃描電鏡(SEM)、紅外發(fā)射率及孔隙率等測試手段分析,探討其對紅外輻射性能的影響及物理機制,主要內(nèi)容如下：GNP法制備高純度尖晶石型MgFe2O4材料,隨著甘氨酸增加,燃燒反應(yīng)愈加劇烈,顆粒內(nèi)部出現(xiàn)大量孔洞；經(jīng)高溫煅燒孔洞逐漸消失,出現(xiàn)明顯燒結(jié)現(xiàn)象,形成片層狀結(jié)構(gòu)。且MgFe2O4材料(G/M=2.5：1)經(jīng)1200℃燒結(jié),3～12μm波段紅外發(fā)射率達到0.80；提高煅燒溫度(900～1100℃),紅外發(fā)射率由0.68增加到0.83。固相法制備的Mg1-xMnxFe2O4材料為尖晶石相MgFe2O4、Fe3O4和Mn3O4；隨著Mn摻雜量的增加,晶胞體積發(fā)生膨脹,晶格參數(shù)增大產(chǎn)生畸變。Mg1-xMnxFe2O4材料FT-IR譜圖相似,隨著Mn摻雜量的改變,吸收峰位置發(fā)生偏移,不同離子占據(jù)尖晶石四面體和八面體位置。通過預(yù)燒再球磨工藝,制備出粒度細小的粉體經(jīng)燒結(jié)得到致密結(jié)構(gòu)陶瓷材料。摻入Mn后組份為Mg0.8Mn0.2Fe2O4的材料性能最佳,3～5μm和8～12μm波段紅外發(fā)射率分別達到0.776和0.936。固相法制備微量Y3+摻雜的Mg0.8Mn0.Fe2O4材料,其物相均為為尖晶石型MgFe2O4 Fe3O4和Mn3O4；且隨著摻雜量的增加,晶胞體積收縮,晶格參數(shù)減小、產(chǎn)生畸變。Y3+摻雜后Fe3O4材料FT-IR譜圖相似,隨著摻雜量的改變,吸收峰位置發(fā)生微偏,Y3+占據(jù)晶格八面體位置。當(dāng)Y203摻雜量為0.6wt.%,材料紅外輻射性能最優(yōu),3～5μm和8-12μm波段紅外發(fā)射率分別達到0.869和0.948。固相法制備Co/Y共摻的M90.8Mn0.2Fe2O4材料,雖為尖晶石結(jié)構(gòu),但其結(jié)晶度較低,使微量摻雜后紅外輻射性能出現(xiàn)小幅降低。且FT-IR譜圖中1000～1200cm-1區(qū)域出現(xiàn)疊加的較寬吸收峰,共摻后組份為(Mg08Mn0.2)0.7Co0.3Fe2O4,摻入0.6wt.%Y2O3的材料性能最優(yōu),3～5μm和8～12μm波段紅外發(fā)射率分別為0.848和0.945。
[Abstract]:In this paper, the spinel ferrite material, which is used in the direction of high power LED heat dissipation, is a new inorganic nonmetallic material, which is composed of iron and one or more other metals. Because of its spinel structure, different valence cations occupy the tetrahedron or octahedron position of crystal, and form different types of spinel structure complex, which makes the ferrite material have good electrical, magnetic and optical properties. The results show that spinel ferrite has good radiation performance in infrared band and can be partially replaced by ions to form a mixed structure to improve its infrared radiation performance. In this paper, MgFe2O4 was studied by using different preparation techniques, ion doping, X-ray diffraction (XRD), Fourier transform infrared spectrometer (FTIR), powder particle size, scanning electron microscope (SEM), infrared emissivity and porosity, etc. The effects on infrared radiation properties and physical mechanism were discussed. The main contents were as follows: high purity spinel MgFe2O4 materials were prepared by the MgFe2O4 method. With the increase of glycine, the combustion reaction became more intense, and a large number of pores appeared in the particles. After high temperature calcination, the holes gradually disappeared, and the obvious sintering phenomenon occurred, forming a lamellar structure. Moreover, the infrared emissivity of MgFe2O4 material (G / M 2.5: 1) sintered at 1200 鈩，

本文編號：1839399