本文選題：鋅硼硅玻璃 + 稀土��； 參考：《內(nèi)蒙古科技大學》2015年碩士論文

【摘要】：本文以鋅硼硅玻璃為研究對象，外加不同含量的氧化鑭和氧化釔，利用高溫旋轉(zhuǎn)粘度計測試玻璃的高溫粘度，通過熱膨脹測試、差熱分析測定玻璃的特征溫度，利用傅里葉紅外檢測結(jié)構(gòu)，研究了不同含量的氧化鑭、氧化釔摻雜對鋅硼硅玻璃的結(jié)構(gòu)和高溫熔體物性的影響。 對于鋅硼硅玻璃（55ZnO-40B2O3-5SiO2，摩爾分數(shù)），從結(jié)構(gòu)上來說，外加氧化鑭和氧化釔，對玻璃的作用是雙向的。少量引入，稀土離子位于網(wǎng)絡(luò)空隙，具有較高的配位數(shù)，高場強，促進了[BO3]三角體向[BO4]四面體的轉(zhuǎn)化，有助于網(wǎng)絡(luò)結(jié)構(gòu)變得緊密。但在稀土摻雜量繼續(xù)上升時，由于Y3+的半徑比La3+的半徑小，Y3+的場強比La3+大，給出游離氧的能力小，因此當氧化鑭摻雜量大于1.0%，氧化釔大于1.5%，稀土氧化物促進[BO3]和非橋氧的生成，起斷網(wǎng)作用，破壞了玻璃的網(wǎng)絡(luò)結(jié)構(gòu)，使結(jié)構(gòu)變得疏松。 氧化鑭與氧化釔的摻雜導致鋅硼硅玻璃的結(jié)構(gòu)發(fā)生變化，影響了玻璃的高溫熔體物性。在少量摻雜時，鋅硼硅玻璃的自由體積分數(shù)減小，自由體積減少，結(jié)構(gòu)變得緊密，粘度提高，玻璃的熱膨脹系數(shù)減小，動力學脆性指數(shù)減小，動力學脆性下降，成玻能力增大；但摻雜過量后，鋅硼硅玻璃的自由體積分數(shù)增大，自由體積增多，結(jié)構(gòu)變得疏松，粘度下降，玻璃的熱膨脹系數(shù)增大，動力學脆性指數(shù)增大，動力學脆性上升，成玻能力減小。 在補充實驗中，選定摩爾組分55ZnO-40B2O3-5SiO2為基礎(chǔ)組分，研究了Al2O3部分取代B2O3對鋅硼硅玻璃的結(jié)構(gòu)和高溫熔體物性的影響。 隨著氧化鋁對氧化硼的替代，B/Al比下降，Al3+奪取游離氧形成[AlO4]進入網(wǎng)絡(luò)結(jié)構(gòu)，促進橋氧的生成，[BO3]三角體與[BO4]四面體相互鏈接形成高硼基團，把斷網(wǎng)重新連接起來，使玻璃結(jié)構(gòu)網(wǎng)絡(luò)聚集更加緊密。隨著加入鋅硼硅玻璃的氧化鋁含量從摩爾百分數(shù)0增加到4，B/Al比下降，鋅硼硅玻璃的自由體積分數(shù)減小，玻璃的自由體積減少，結(jié)構(gòu)變得緊密，使玻璃粘度上升，玻璃的動力學脆性指數(shù)下降，動力學脆性下降，成玻能力增大，，成形溫度范圍擴大，熔體隨溫度變化時其粘度變化速率變慢。
[Abstract]:In this paper, zinc-borosilicate glass is used as the research object, with different contents of lanthanum oxide and yttrium oxide added, the high temperature viscosity of the glass is measured by high temperature rotary viscometer, the characteristic temperature of the glass is measured by thermal expansion test, and the characteristic temperature of glass is measured by differential thermal analysis. The effects of different contents of lanthanum oxide and yttrium oxide on the structure and physical properties of zinc-borosilicate glass were studied by Fourier transform infrared spectroscopy (FTIR). For zinc-borosilicate glass (55ZnO-40B _ 2O _ 3-5SiO _ 2), the effect of addition of lanthanum oxide and yttrium oxide on the glass structure is bidirectional. A small amount of rare earth ions is introduced in the network space with high coordination number and high field strength, which promotes the transformation of [BO3] triangle to [BO4] tetrahedron, and helps to make the network structure close. However, when the rare-earth doping amount continues to rise, because the radius of Y _ 3 is smaller than that of La _ 3 and the field strength of Y _ 3 is larger than that of La _ 3, the ability of free oxygen is smaller. Therefore, when the doping amount of lanthanum oxide is greater than 1.0 and the amount of yttrium oxide is greater than 1.5, rare earth oxides promote the formation of [BO3] and unbridged oxygen. It breaks the network, destroys the network structure of glass, and makes the structure loose. The doping of lanthanum oxide and yttrium oxide leads to the change of the structure of Zn-Borosilicate glass and affects the physical properties of the glass melt at high temperature. With a small amount of doping, the free volume fraction and free volume of Zn-Borosilicate glass decrease, the structure becomes compact, the viscosity increases, the thermal expansion coefficient of the glass decreases, the dynamic brittleness index decreases, the dynamic brittleness decreases, and the glassy forming ability increases. But after excessive doping, the free volume fraction and free volume increased, the structure became loose, the viscosity decreased, the thermal expansion coefficient of the glass increased, the dynamic brittleness index increased, the dynamic brittleness increased, and the glassy forming ability decreased. In the supplementary experiment, the effect of partial substitution of Al _ 2O _ 3 on the structure of Zn-Borosilicate glass and the physical properties of high temperature melt was studied by selecting 55ZnO-40B _ 2O _ 3-5SiO _ 2 as the basic component. As Al _ 2O _ 3 replaces boron oxide with B / Al ratio, Al _ 3 grabs free oxygen to form [AlO _ 4] into the network structure, which promotes the formation of bridge oxygen, [BO _ 3] triangle and [BO _ 4] tetrahedron are linked to each other to form high boron group, and the broken network is reconnected. Make the glass structure network closer together. With the increase of Al _ 2O _ 3 content in Zn-Borosilicate glass from 0 mol% to 4 W / Al ratio, the free volume fraction of Zn-Borosilicate glass decreases, the free volume of the glass decreases, the structure becomes compact, and the viscosity of the glass increases. The dynamic brittleness index of glass decreases, the dynamic brittleness decreases, the glassy forming ability increases, the forming temperature range is enlarged, and the viscosity of the melt slows down with the change of temperature.
【學位授予單位】：內(nèi)蒙古科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TQ171.1

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