镁铝硅玻璃的析晶、烧结以及球化

发布时间：2018-02-12 01:27

本文关键词： 镁铝硅玻璃析晶烧结球化　出处：《济南大学》2015年硕士论文　论文类型：学位论文

【摘要】：普通玻璃纤维广泛用于玻璃钢行业。近年来,为服务于国防工业,我国高强玻璃纤维已经进入了工业化生产阶段。如何处理玻璃生产过程中产生的废丝成为企业难题。本论文着眼于将玻璃纤维废丝用于制备烧结微晶玻璃和球形支撑剂颗粒,从著名的S型高强玻璃纤维的组成出发,制备出了一系列镁铝硅系统玻璃,考察了添加物对玻璃的性质及析晶、烧结、球化等行为的影响,为实际回收利用废丝积累实验数据。在外加不同含量Na2O的MgO-Al2O3-Si O2玻璃中引入澄清剂CeO2,晶核剂TiO2,助熔剂Li2O、CaF2,进一步加入CaO、ZnO,测定不同玻璃的密度和维氏硬度,并采用DTA、XRD、SEM、TEM等手段分析了玻璃的相变及析晶行为。研究表明:CaO、ZnO的引入增大了玻璃的密度,但二者的加入却减小了玻璃试样的维氏硬度,含CaO和ZnO的玻璃较只含CaO的玻璃硬度大,玻璃的密度和维氏硬度随Na2O含量增加呈先增大后减小的趋势。CaO、ZnO、Na2O的引入都可减小玻璃的粘度,降低了玻璃的转变温度。含3%Na2O的玻璃经过热处理后主要析出锂铝硅酸盐、尖晶石和二氧化钛;随着Na2O添加量的升高,会产生新的钠钙长石晶相,且使得尖晶石和二氧化钛晶相转变为锌尖晶石和镁酸钛。对析晶情况较好的镁铝硅玻璃颗粒进行了烧结实验。研究表明,随着成型压力的增大、粒径的减小,烧结试样力学性能增强;采用粒径分布范围宽的玻璃粉有助于提高烧结试样的力学性能。烧结温度和烧结过程中的析晶共同影响着烧结试样的力学性能;随着烧结温度的升高,析晶加剧并阻碍烧结过程,使得烧结体的力学性能变差。对玻璃粉末进行的球化实验表明,玻璃粉的颗粒越小越容易球化,但析晶和玻璃熔化速度影响所得样品的圆度和球度。含9%Na2O、3%NaCl、1%CaF2的MgO-Al2O3-SiO2玻璃的粘度及熔化速度适中,且玻璃颗粒球化过程无析晶现象,能较好地被球化,所得样品的球度和圆度均达0.9,但抗压测试破碎率及酸溶解度较大,只能作为低等级支撑剂使用。此外,在热处理过程中隔离剂MgO含量在50wt%时较适宜,其用量过高在试样中残留量高,难以分离,若过低则使球化效果变差。
[Abstract]:Common glass fiber is widely used in the fiberglass industry. In recent years, in order to serve the national defense industry, High strength glass fiber in China has entered the stage of industrial production. How to deal with the waste silk produced in the process of glass production has become a difficult problem for enterprises. This paper focuses on the preparation of sintered glass-ceramics and spherical proppant particles. A series of magnesia-aluminum-silicon system glasses were prepared from the composition of famous S-type high-strength glass fibers. The effects of additives on the properties and crystallization, sintering and spheroidization of the glasses were investigated. In order to accumulate experimental data for practical recycling of waste wire, clarification agent CeO2, nucleating agent TiO2, fluxing agent Li2O-CaF2 were introduced into MgO-Al2O3-Si O2 glass with different content of Na2O. The density and Vickers hardness of different glass were determined by adding CaO-ZnO. The phase transition and crystallization behavior of the glass were analyzed by means of DTA-XRDX, SEM and TEM. The results show that the introduction of CaO increases the density of the glass, but the Vickers hardness of the glass sample decreases with the addition of the two elements. The hardness of the glass containing CaO and ZnO is higher than that of the glass containing only CaO. The density and Vickers hardness of the glass increase first and then decrease with the increase of Na2O content. The viscosity of the glass decreases and the transition temperature of the glass decreases with the introduction of Na2O. The glass containing 3% Na2O mainly precipitates lithium aluminosilicate after heat treatment. Spinel and titanium dioxide; with the increase of the amount of Na2O, a new crystalline phase of sodium calcium feldspar is produced. The spinel and titanium dioxide phases were transformed into zinc spinel and titanium magnesium acid. The sintering experiments of magnesia-aluminum-silicate glass particles with better crystallization conditions were carried out. The results show that the particle size decreases with the increase of molding pressure. The mechanical properties of the sintered samples are enhanced, and the mechanical properties of the sintered samples are improved by using glass powder with wide particle size distribution. The sintering temperature and the crystallization during the sintering process affect the mechanical properties of the sintered samples; with the increase of the sintering temperature, the mechanical properties of the sintered samples are increased. Crystallization intensifies and hinders the sintering process, which makes the mechanical properties of the sintered body worse. The spheroidizing experiment of glass powder shows that the smaller the glass powder is, the easier it is to spheroidize. However, crystallization and glass melting rate affect the roundness and sphericity of the samples. The viscosity and melting rate of the MgO-Al2O3-SiO2 glass containing 9 Na2O3 and 1F2 are moderate, and there is no crystallization in the spheroidizing process of the glass particles, which can be well spheroidized. The sphericity and roundness of the obtained samples are both up to 0.9, but the crushing rate and acid solubility of the obtained samples are high and can only be used as low-grade proppant. In addition, when the content of MgO is 50wt% during heat treatment, it is more suitable. It is difficult to separate the residue in the sample because of its high content. If it is too low, the spheroidization effect will become worse.
【学位授予单位】：济南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ171.1

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