磁鉛石結(jié)構(gòu)鋁酸鹽的光—光、熱—光及熱傳導(dǎo)性能的研究
發(fā)布時(shí)間：2018-11-13 09:20
【摘要】：節(jié)能減排是經(jīng)濟(jì)社會(huì)可持續(xù)發(fā)展的迫切需求。高溫工業(yè)窯爐是重要的高能耗設(shè)備之一,降低其能耗具有重要意義。本論文針對(duì)高溫工業(yè)窯爐的爐襯材料,提出開(kāi)發(fā)磁鉛石結(jié)構(gòu)新型LnMeAl_(11)O_(19)低導(dǎo)熱系數(shù)耐高溫隔熱材料,并在高溫?zé)醾鲗?dǎo)等方面的應(yīng)用上開(kāi)展研究工作,實(shí)現(xiàn)高溫工業(yè)窯爐的節(jié)能降耗。采用高溫固相合成法制備得到了不同稀土離子Ln3+(La、Ce、Nd、Sm、Eu、Gd)和過(guò)渡金屬離子Me2+(Mn、Co、Ni、Zn)取代的LnMeAl_(11)O_(19)單相材料,優(yōu)化的工藝條件分別為1550°C和1600°C并保溫5h,產(chǎn)物均為磁鉛石結(jié)構(gòu),其板片狀晶粒尺寸隨著合成溫度升高而增大,晶胞參數(shù)隨Ln3+離子半徑降低而減小,隨Me2+原子質(zhì)量增加而減小。利用無(wú)壓燒結(jié)工藝制備得到了不同稀土離子和過(guò)渡金屬離子取代的LnMeAl_(11)O_(19)陶瓷材料,對(duì)其力學(xué)和熱物理性能進(jìn)行了系統(tǒng)研究,發(fā)現(xiàn)Ln3+離子半徑減小或Me2+原子質(zhì)量增大會(huì)增強(qiáng)LnMeAl_(11)O_(19)材料的力學(xué)性能并降低其導(dǎo)熱系數(shù),其機(jī)制為小半徑離子取代使晶胞體積收縮并導(dǎo)致其體積密度增大和聲子散射增強(qiáng)。稀土離子取代產(chǎn)物中GdMgAl11O19在25°C至800°C溫度范圍的導(dǎo)熱系數(shù)最低,為1.91-1.78W/m?K;過(guò)渡金屬取代產(chǎn)物中LaZnAl11O19的性能最優(yōu),其抗折強(qiáng)度和斷裂韌性分別為163.3MPa和3.3MPa?m1/2。研究了稀土離子Pr3+、Sm3+、Dy3+、Ho3+、Er3+和Tm3+單/雙摻雜的LaMgAl_(11)O_(19)材料的光-光轉(zhuǎn)換性能,結(jié)果發(fā)現(xiàn)材料的光-光轉(zhuǎn)換過(guò)程、光轉(zhuǎn)換光譜和激發(fā)態(tài)壽命與摻雜稀土離子4f層電子在特定能級(jí)輻射躍遷相關(guān);發(fā)現(xiàn)Sm3+→Eu3+、Tm3+→Dy3+和Er3+→Sm3+三對(duì)稀土離子間具有明顯的能量傳遞作用,其機(jī)制為輻射再吸收和共振能量傳遞;光轉(zhuǎn)換性能濃度猝滅和溫度猝滅現(xiàn)象的機(jī)理為激活劑離子間的級(jí)聯(lián)能量傳遞和交叉弛豫作用。系統(tǒng)研究了成分和溫度等因素對(duì)LaMgAl_(11)O_(19)系材料高溫紅外熱-光轉(zhuǎn)換性能的影響,研究表明稀土離子和過(guò)渡金屬離子取代或摻雜可以明顯提高LaMgAl_(11)O_(19)材料的高溫平均發(fā)射率,其中LaMgAl_(11)O_(19):Er3+,Sm3+和LaZnAl11O19材料在800°C的平均發(fā)射率可達(dá)0.906和0.915;溫度升高也能夠顯著增大LaMgAl_(11)O_(19)系材料的熱-光轉(zhuǎn)換發(fā)射光譜強(qiáng)度和光譜發(fā)射率。在氧化鋁陶瓷片表面制備LaMgAl_(11)O_(19)涂層能夠顯著降低陶瓷的高溫?zé)醾鲗?dǎo)性能,結(jié)果表明LaMgAl_(11)O_(19)系材料可在工業(yè)窯爐爐襯材料工作面的低導(dǎo)熱節(jié)能隔熱層新材料方面具有重要的應(yīng)用前景。
[Abstract]:Energy saving and emission reduction is an urgent need for sustainable economic and social development. High temperature industrial kiln is one of the most important equipments with high energy consumption, and it is of great significance to reduce its energy consumption. In this paper, a new type of LnMeAl_ (11) O _ (19) thermal insulation material with low thermal conductivity is developed for the lining material of high temperature industrial furnace, and the research work is carried out in the application of high temperature heat conduction and so on. Energy saving and consumption reduction of high temperature industrial kiln are realized. Different rare earth ions Ln3 (La,Ce,Nd,Sm,Eu,Gd) and transition metal ion Me2 (Mn,Co,Ni,Zn) substituted LnMeAl_ (11) O _ (19) single phase materials were prepared by high temperature solid state synthesis. The optimized process conditions were 1550 擄C and 1600 擄C for 5 h, respectively. The products were magnetized lead stone structure. The plate grain size increased with the increase of synthesis temperature, and the unit cell parameters decreased with the decrease of Ln3 ion radius and with the increase of Me2 atom mass. LnMeAl_ (11) O _ (19) ceramics with different rare earth ions and transition metal ions were prepared by pressureless sintering process. The mechanical and thermo-physical properties of LnMeAl_ (11) O _ (19) ceramics were systematically studied. It is found that the decrease of Ln3 ion radius or the increase of Me2 atom mass will enhance the mechanical properties and decrease the thermal conductivity of LnMeAl_ (11) O _ (19) material. The mechanism is that the small radius ion substitution results in the contraction of the unit cell volume and the increase of its bulk density and phonon scattering. The thermal conductivity of GdMgAl11O19 in the range of 25 擄C to 800 擄C was the lowest, ranging from 1.91 to 1.78 W / mK. The properties of LaZnAl11O19 in transition metal substituents are the best, and the flexural strength and fracture toughness are 163.3MPa and 3.3 MPA / m ~ (1 / 2), respectively. The optical to optical conversion properties of rare earth ions Pr3, Sm3, Dy3, Ho3, Er3 and Tm3 doped LaMgAl_ (11) O _ (19) were studied. The optical conversion spectra and the lifetime of excited states are related to the radiation transition of the doped rare earth ions 4f layer electrons at specific energy levels. It is found that Sm3 Eu3, Tm3 Dy3 and Er3 Sm3 have obvious energy transfer between rare earth ions, the mechanism of which is radiation reabsorption and resonance energy transfer. The mechanisms of concentration quenching and temperature quenching are cascade energy transfer and cross relaxation between activator ions. The effects of composition and temperature on the thermo-optical conversion properties of LaMgAl_ (11) O _ (19) materials at high temperature were studied systematically. The results show that the high temperature average emissivity of LaMgAl_ (11) O _ (19) materials can be significantly increased by substitution or doping of rare earth ions and transition metal ions, in which LaMgAl_ (11) O _ (19): Er3, The average emissivity of Sm3 and LaZnAl11O19 materials can reach 0.906 and 0.915 at 800 擄C. The thermo-optical conversion emission spectra and the spectral emissivity of LaMgAl_ (11) O _ (19) materials can also be significantly increased by increasing the temperature. The preparation of LaMgAl_ (11) O _ (19) coatings on alumina ceramic substrates can significantly reduce the thermal conductivity of the ceramics at high temperature. The results show that LaMgAl_ (11) O _ (19) material can be used as a new material for low thermal conductivity and energy saving thermal insulation in industrial furnace lining.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類號(hào)】：TQ174.1;TQ054
本文編號(hào)：2328673
[Abstract]:Energy saving and emission reduction is an urgent need for sustainable economic and social development. High temperature industrial kiln is one of the most important equipments with high energy consumption, and it is of great significance to reduce its energy consumption. In this paper, a new type of LnMeAl_ (11) O _ (19) thermal insulation material with low thermal conductivity is developed for the lining material of high temperature industrial furnace, and the research work is carried out in the application of high temperature heat conduction and so on. Energy saving and consumption reduction of high temperature industrial kiln are realized. Different rare earth ions Ln3 (La,Ce,Nd,Sm,Eu,Gd) and transition metal ion Me2 (Mn,Co,Ni,Zn) substituted LnMeAl_ (11) O _ (19) single phase materials were prepared by high temperature solid state synthesis. The optimized process conditions were 1550 擄C and 1600 擄C for 5 h, respectively. The products were magnetized lead stone structure. The plate grain size increased with the increase of synthesis temperature, and the unit cell parameters decreased with the decrease of Ln3 ion radius and with the increase of Me2 atom mass. LnMeAl_ (11) O _ (19) ceramics with different rare earth ions and transition metal ions were prepared by pressureless sintering process. The mechanical and thermo-physical properties of LnMeAl_ (11) O _ (19) ceramics were systematically studied. It is found that the decrease of Ln3 ion radius or the increase of Me2 atom mass will enhance the mechanical properties and decrease the thermal conductivity of LnMeAl_ (11) O _ (19) material. The mechanism is that the small radius ion substitution results in the contraction of the unit cell volume and the increase of its bulk density and phonon scattering. The thermal conductivity of GdMgAl11O19 in the range of 25 擄C to 800 擄C was the lowest, ranging from 1.91 to 1.78 W / mK. The properties of LaZnAl11O19 in transition metal substituents are the best, and the flexural strength and fracture toughness are 163.3MPa and 3.3 MPA / m ~ (1 / 2), respectively. The optical to optical conversion properties of rare earth ions Pr3, Sm3, Dy3, Ho3, Er3 and Tm3 doped LaMgAl_ (11) O _ (19) were studied. The optical conversion spectra and the lifetime of excited states are related to the radiation transition of the doped rare earth ions 4f layer electrons at specific energy levels. It is found that Sm3 Eu3, Tm3 Dy3 and Er3 Sm3 have obvious energy transfer between rare earth ions, the mechanism of which is radiation reabsorption and resonance energy transfer. The mechanisms of concentration quenching and temperature quenching are cascade energy transfer and cross relaxation between activator ions. The effects of composition and temperature on the thermo-optical conversion properties of LaMgAl_ (11) O _ (19) materials at high temperature were studied systematically. The results show that the high temperature average emissivity of LaMgAl_ (11) O _ (19) materials can be significantly increased by substitution or doping of rare earth ions and transition metal ions, in which LaMgAl_ (11) O _ (19): Er3, The average emissivity of Sm3 and LaZnAl11O19 materials can reach 0.906 and 0.915 at 800 擄C. The thermo-optical conversion emission spectra and the spectral emissivity of LaMgAl_ (11) O _ (19) materials can also be significantly increased by increasing the temperature. The preparation of LaMgAl_ (11) O _ (19) coatings on alumina ceramic substrates can significantly reduce the thermal conductivity of the ceramics at high temperature. The results show that LaMgAl_ (11) O _ (19) material can be used as a new material for low thermal conductivity and energy saving thermal insulation in industrial furnace lining.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類號(hào)】：TQ174.1;TQ054
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