【作者】 杜勇；

【导师】 谢峻林；

【作者基本信息】 武汉理工大学 ， 材料学， 2006， 硕士

【摘要】 本文对微晶玻璃,尤其是SrO-Al₂O₃-SiO₂系统微晶玻璃的研究现状、制备技术及其应用作了较系统的叙述。在实验中,通过改变SrO-Al₂O₃-SiO₂系统微晶玻璃的基础组分,运用DTA、XRD、SEM等测试手段,结合微晶玻璃的抗折强度及热膨胀系数,研究其组成、热处理制度与结构、性能之间的相互联系和影响规律。并通过实验确立比较合理的组分以及热处理制度,制备具有优良性及合理晶相组成的微晶玻璃材料。 首先,研究了微晶玻璃中组分SrO含量的变化对微晶玻璃结构和性能的影响。研究表明:在SrO的含量变化范围内,微晶玻璃中只生成单斜锶长石晶相,并且随SrO含量的增加,微晶玻璃的抗折强度先增加后减小,在含量为20%时,微晶玻璃具有较高的强度和较低的热膨胀系数。同时,较低的核化温度与较高的晶化温度有利于玻璃的晶化和提高微晶玻璃的力学性能与热学性能。 其次,研究了微晶玻璃中另一组分Al₂O₃含量的变化对微晶玻璃结构和性能的影响。研究表明:当Al₂O₃含量较高时,微晶玻璃中生成单斜锶长石和六方硅铝锶石两种晶相,并且六方硅铝锶石向单斜锶长石转变:当Al₂O₃+SrO含量为20%+20%时,微晶玻璃微观结构致密,其热膨胀系数最小,当Al₂O₃+SrO含量为26%+20%时,微晶玻璃中生成晶相多,其抗折强度值最大。 进一步通过正交实验,研究热处理制度分别对微晶玻璃抗折强度和热膨胀系数的影响。对于抗折强度,较好的热处理制度为:核化温度925℃,核化时间3h,晶化温度1180℃,晶化时间2h。因素的主次顺序为:核化温度>核化时间>晶化温度>晶化时间;对于热膨胀系数,热处理制度对其影响不大,只能在较小范围内改变微晶玻璃的热膨胀系数。 最后,在上述实验的基础上对晶核剂的组分进行调整,在保持TiO₂+ZrO₂总含量不变的情况下,通过改变TiO₂与ZrO₂的含量来研究晶核剂对微晶玻璃结晶与性能的影响。结果表明:以ZrO₂为晶核剂能够使微晶玻璃结构趋于紧密,降低热膨胀系数;以TiO₂为晶核剂使微晶玻璃析晶较少,剩余玻璃相较多,热膨胀系数变大;以ZrO₂+TiO₂为复合晶核剂,且含量为2%+2%时,微晶玻璃获得较优的抗折强度和低的热膨胀系数,综合性能最佳。更多还原

【Abstract】 In this paper, the research background, classification, faBaication technology and application of glass-ceramics （mainly about SrO-Al₂O₃-SiO₂ system glass-ceramics） were systematically reviewed. The influence of heat treatment and composition on structure and properties of the SrO-Al₂O₃-SiO₂ system glass-ceramics were investigated by DTA, XRD and SEM. And relationships among composition, heat treatment, crystallization and properties were studied to attain some results about reasonable composition and heat treatments and high-performance glass-ceramic substrate.Firstly, the influence of SrO content on crystallization and properties of the glass-ceramics was investigated. The results showed that there was only the monocelsian phase existed in the glass-ceramics, with various SrO contents. And the flexure strength of the glass-ceramics increased firstly and then decreased, with the increasing of SrO content. thus, the higher strength and lower thermal expansion coefficient were obtained when the SrO content was 20%. At the same time, lower nucleation temperature and higher crystallization temperature in favor of the crystallization degree and mechanical and thermal properties of the glass-ceramics.Secondly, the influence of Al₂O₃ content on crystallization and properties of the glass-ceramics was studied. The results indicated formation of the monocelsian and the hexcelsian phase and transformation from the hexcelsian phase to the monocelsian phase in the glass-ceramics when the Al₂O₃ content was high. And when the Al₂O₃ + SrO content was 20% +20%, the micro-structure of glass-ceramics was compact and the thermal expansion coefficient was lower. Then when the content was 26%+20%,the glass-ceramics show higher flexure strength for its higher degree of crystallization.And then, the influence of heat treatment system on the flexure strength and the thermal expansion coefficient of SrO-Al₂O₃-SiO₂ system glass-ceramics was investigated. The better heat treatment system was obtained by the analysis of cross experiment to each factor of the heat treatment, containing the nucleation temperature 925℃, nucleation time 180 min;crystal temperature 1180℃, crystal time120 min. The important order of relevant factors is: nucleation temperature> nucleationtime>crystal temperaturOcrystal time. However, the influence of heat treatment system on the thermal expansion coefficient was slight.Finally, according to the above experiment, the proper composition of base glass was selected. When TiO2+ZrO2 content was constant, the influence of changing the content of TiO2 and/or ZrO2 based on the proper composition and various heat treatment temperatures on crystallization behavior and properties of the glass-ceramics was investigated. And the results demonstrated that the micro-structure of glass-ceramics would prone to compact and the thermal expansion coefficient lowered, used ZrCh for single nucleation agent;there were slight crystal and large mount of glass existed in the glass-ceramics, with higher thermal expansion coefficient, used TiO2 as single nucleation;the glass-ceramics with higher flexure strength and lower thermal expansion coefficient could be faBaicated by using ZrO2 +TiC>2 as complex nucleation agents and contents was 2 % +2 %.更多还原