本文關(guān)鍵詞： 鎂鋁硅玻璃 析晶 燒結(jié) 球化　出處：《濟南大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：普通玻璃纖維廣泛用于玻璃鋼行業(yè)。近年來,為服務(wù)于國防工業(yè),我國高強玻璃纖維已經(jīng)進入了工業(yè)化生產(chǎn)階段。如何處理玻璃生產(chǎn)過程中產(chǎn)生的廢絲成為企業(yè)難題。本論文著眼于將玻璃纖維廢絲用于制備燒結(jié)微晶玻璃和球形支撐劑顆粒,從著名的S型高強玻璃纖維的組成出發(fā),制備出了一系列鎂鋁硅系統(tǒng)玻璃,考察了添加物對玻璃的性質(zhì)及析晶、燒結(jié)、球化等行為的影響,為實際回收利用廢絲積累實驗數(shù)據(jù)。在外加不同含量Na2O的MgO-Al2O3-Si O2玻璃中引入澄清劑CeO2,晶核劑TiO2,助熔劑Li2O、CaF2,進一步加入CaO、ZnO,測定不同玻璃的密度和維氏硬度,并采用DTA、XRD、SEM、TEM等手段分析了玻璃的相變及析晶行為。研究表明:CaO、ZnO的引入增大了玻璃的密度,但二者的加入?yún)s減小了玻璃試樣的維氏硬度,含CaO和ZnO的玻璃較只含CaO的玻璃硬度大,玻璃的密度和維氏硬度隨Na2O含量增加呈先增大后減小的趨勢。CaO、ZnO、Na2O的引入都可減小玻璃的粘度,降低了玻璃的轉(zhuǎn)變溫度。含3%Na2O的玻璃經(jīng)過熱處理后主要析出鋰鋁硅酸鹽、尖晶石和二氧化鈦;隨著Na2O添加量的升高,會產(chǎn)生新的鈉鈣長石晶相,且使得尖晶石和二氧化鈦晶相轉(zhuǎn)變?yōu)殇\尖晶石和鎂酸鈦。對析晶情況較好的鎂鋁硅玻璃顆粒進行了燒結(jié)實驗。研究表明,隨著成型壓力的增大、粒徑的減小,燒結(jié)試樣力學(xué)性能增強;采用粒徑分布范圍寬的玻璃粉有助于提高燒結(jié)試樣的力學(xué)性能。燒結(jié)溫度和燒結(jié)過程中的析晶共同影響著燒結(jié)試樣的力學(xué)性能;隨著燒結(jié)溫度的升高,析晶加劇并阻礙燒結(jié)過程,使得燒結(jié)體的力學(xué)性能變差。對玻璃粉末進行的球化實驗表明,玻璃粉的顆粒越小越容易球化,但析晶和玻璃熔化速度影響所得樣品的圓度和球度。含9%Na2O、3%NaCl、1%CaF2的MgO-Al2O3-SiO2玻璃的粘度及熔化速度適中,且玻璃顆粒球化過程無析晶現(xiàn)象,能較好地被球化,所得樣品的球度和圓度均達0.9,但抗壓測試破碎率及酸溶解度較大,只能作為低等級支撐劑使用。此外,在熱處理過程中隔離劑MgO含量在50wt%時較適宜,其用量過高在試樣中殘留量高,難以分離,若過低則使球化效果變差。
[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.
【學(xué)位授予單位】：濟南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ171.1

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本文編號：1504472