本文選題：鋁硼硅酸鹽 + 玻璃纖維　； 參考：《濟南大學》2015年碩士論文

【摘要】：本文研究稀土氧化物摻雜制備低介電鋁硼硅酸鹽玻璃。以玻璃纖維生產工藝要求為基準,通過玻璃熱穩(wěn)定性、玻璃拉絲性能和介電性能測試,以及紅外光譜和密度分析,對稀土氧化物摻雜鋁硼硅酸鹽玻璃進行了系統(tǒng)的研究。在降低介電常數(shù)和介電損耗,提高介電性能的基礎上,獲得了拉絲性能和熱穩(wěn)定性優(yōu)異的玻璃纖維基本組成配比,同時成功制得低介電鋁硼硅酸鹽玻璃纖維絲。具體實驗結論如下:(1)研究了氧化鑭和氧化鈰分別摻入鋁硼硅酸鹽玻璃系統(tǒng)中制備低介電玻璃纖維。稀土氧化物的摻入,使得玻璃網(wǎng)絡結構致密度先增大后減弱。這是因為稀土離子場強較大,含量較少時能夠進入網(wǎng)絡間隙中連接負離子基團作為電荷補償,起到“補網(wǎng)”作用;而含量增大,引入更多的游離氧,反而“斷網(wǎng)”作用主導玻璃結構的解聚,這導致了玻璃的熱穩(wěn)定性、介電性能隨稀土氧化物的增加產生先增強后減弱的變化。而氧化鈰的引入使得玻璃形成新的析晶相,玻璃的熱穩(wěn)定性變差。(2)研究CaO/La2O3比變化對鋁硼硅酸鹽玻璃性能的影響。隨著CaO/La2O3比的降低,玻璃化轉變溫度降低,而析晶受到抑制,900-1000℃產生的低溫析晶放熱峰消失,玻璃的熱穩(wěn)定性得到提高;氧化鑭的引入抑制硼揮發(fā),B3+離子的電子極化率最低,對玻璃的介電性能有積極的影響。隨著氧化鑭的增加,玻璃的密度逐漸增大,這主要與La3+的補網(wǎng)作用和相對原子質量較大等有關;此外玻璃拉絲性能得到改善,呈現(xiàn)先減小后增大的變化趨勢。對RM-1玻璃樣品(即CaO/La2O3比為44.86)拉絲,纖維平均直徑為71.19μm,其介電常數(shù)和介電損耗分別為4.84和0.0025,相對于E玻璃纖維,介電性能大大提高,同時其拉絲性能和熱穩(wěn)定性優(yōu)異,符合池窯拉絲設備制得玻璃纖維的生產要求。(3)通過正交實驗發(fā)現(xiàn),對于介電常數(shù)而言,CaO/La2O3和B2O3影響顯著;但是SiO2和B2O3對介電損耗影響最大。而Al2O3和SiO2對玻璃的熱穩(wěn)定性和拉絲性能起主導作用。通過綜合分析,設計最優(yōu)配比進行拉絲實驗均能拉制成玻璃纖維絲,玻璃纖維的平均直徑為20μm,纖維尺寸平整,介電常數(shù)和介電損耗分別為4.80和0.00218,適合制備低介電鋁硼硅酸鹽玻璃纖維。
[Abstract]:The preparation of low dielectric aluminum borosilicate glasses by rare earth oxide doping is studied in this paper. Based on the technological requirements of glass fiber production, the rare earth oxide doped aluminoborosilicate glasses were systematically studied by means of the thermal stability, the properties of glass wire drawing and dielectric properties, and the infrared spectrum and density analysis. On the basis of decreasing the dielectric constant and dielectric loss and improving the dielectric properties, the basic composition ratio of glass fiber with excellent drawing property and thermal stability was obtained. At the same time, the low dielectric aluminum borosilicate glass fiber wire was successfully prepared. The experimental results are as follows: (1) the preparation of low dielectric glass fiber by doping lanthanum oxide and cerium oxide into aluminoborosilicate glass system is studied. With the addition of rare earth oxides, the density of glass network structure increases first and then weakens. This is because the rare earth ions have a larger field strength, and when the content of rare earth ions is small, they can enter the gap of the network to connect the negative ion groups as the charge compensation, and play the role of "compensating the net", while the content of the rare earth ions increases, and more free oxygen is introduced. On the contrary, the effect of "network breaking" dominates the depolymerization of glass structure, which leads to the thermal stability of the glass, and the dielectric properties increase first and then weaken with the increase of rare earth oxides. With the introduction of cerium oxide, a new crystalline phase was formed, and the thermal stability of the glass became worse. The effect of the ratio of Cao / La _ 2O _ 3 on the properties of aluminoborosilicate glasses was studied. With the decrease of Cao / La _ 2O _ 3 ratio, the glass transition temperature decreases, and the exothermic peak of crystallization at 900-1000 鈩，

本文編號：2049140