稀土氧化物掺杂铝硼硅酸盐系统玻璃的制备

发布时间：2018-06-21 14:57

  本文选题：铝硼硅酸盐 + 玻璃纤维　； 参考：《济南大学》2015年硕士论文

【摘要】：本文研究稀土氧化物掺杂制备低介电铝硼硅酸盐玻璃。以玻璃纤维生产工艺要求为基准,通过玻璃热稳定性、玻璃拉丝性能和介电性能测试,以及红外光谱和密度分析,对稀土氧化物掺杂铝硼硅酸盐玻璃进行了系统的研究。在降低介电常数和介电损耗,提高介电性能的基础上,获得了拉丝性能和热稳定性优异的玻璃纤维基本组成配比,同时成功制得低介电铝硼硅酸盐玻璃纤维丝。具体实验结论如下:(1)研究了氧化镧和氧化铈分别掺入铝硼硅酸盐玻璃系统中制备低介电玻璃纤维。稀土氧化物的掺入,使得玻璃网络结构致密度先增大后减弱。这是因为稀土离子场强较大,含量较少时能够进入网络间隙中连接负离子基团作为电荷补偿,起到“补网”作用;而含量增大,引入更多的游离氧,反而“断网”作用主导玻璃结构的解聚,这导致了玻璃的热稳定性、介电性能随稀土氧化物的增加产生先增强后减弱的变化。而氧化铈的引入使得玻璃形成新的析晶相,玻璃的热稳定性变差。(2)研究CaO/La2O3比变化对铝硼硅酸盐玻璃性能的影响。随着CaO/La2O3比的降低,玻璃化转变温度降低,而析晶受到抑制,900-1000℃产生的低温析晶放热峰消失,玻璃的热稳定性得到提高;氧化镧的引入抑制硼挥发,B3+离子的电子极化率最低,对玻璃的介电性能有积极的影响。随着氧化镧的增加,玻璃的密度逐渐增大,这主要与La3+的补网作用和相对原子质量较大等有关;此外玻璃拉丝性能得到改善,呈现先减小后增大的变化趋势。对RM-1玻璃样品(即CaO/La2O3比为44.86)拉丝,纤维平均直径为71.19μm,其介电常数和介电损耗分别为4.84和0.0025,相对于E玻璃纤维,介电性能大大提高,同时其拉丝性能和热稳定性优异,符合池窑拉丝设备制得玻璃纤维的生产要求。(3)通过正交实验发现,对于介电常数而言,CaO/La2O3和B2O3影响显著;但是SiO2和B2O3对介电损耗影响最大。而Al2O3和SiO2对玻璃的热稳定性和拉丝性能起主导作用。通过综合分析,设计最优配比进行拉丝实验均能拉制成玻璃纤维丝,玻璃纤维的平均直径为20μm,纤维尺寸平整,介电常数和介电损耗分别为4.80和0.00218,适合制备低介电铝硼硅酸盐玻璃纤维。
[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，

本文编号：2049140