泡沫微晶玻璃的研究进展

概述了泡沫微晶玻璃的性能及应用,综述了泡沫微晶玻璃的研究进展,并对泡沫微晶玻璃的发展方向进行了展望。     

泡沫微晶玻璃的研究进展

文章介绍了泡沫微晶玻璃的性能及应用，综述了泡沫微晶玻璃的研究进展，并对泡沫微晶玻璃的发展方向做了展望。     

微晶泡沫玻璃与固体废弃物的循环利用

概述了微晶泡沫玻璃的制备工艺原理及流程,从结构方面讨论了微晶泡沫玻璃的性能及应用,介绍了废玻璃、粉煤灰、尾矿、冶炼渣、硼泥、煤矸石、陶瓷废料等固体废弃物在微晶泡沫玻璃中的应用。     

高岭土尾矿微晶泡沫玻璃的研制

以高岭土尾矿为主要原料,加入一定比例的废玻璃、硼砂,采用“一步法”制备微晶泡沫玻璃。研究不同含量的SiC对微晶泡沫玻璃性能的影响。采用DSC、SEM、XRD等测试技术对微晶泡沫玻璃的玻璃物相组成、形貌体积变化进行测试分析。制备出的微晶泡沫玻璃以石英和氧化铝为主晶相,体积密度为0.79 g/cm³,抗压强度可达到18.8 MPa。制备出的微晶泡沫玻璃具有体积密度小,抗压强度高,化学稳定性良好等特点,在建筑陶瓷行业有着广泛的应用价值,为高岭土尾矿重新再利用提供新的途径。     

烧成工艺制度对泡沫微晶玻璃性能的影响

本文利用废玻璃粉和废陶瓷粉制备泡沫微晶玻璃,在确定配方范围的基础上,通过正交优化设计的方法,对制备泡沫微晶玻璃的烧成工艺制度进行优化,使之具有轻质、高强、低导热系数的优良性能.结果表明:烧结温度和发泡温度对泡沫微晶玻璃比强度的影响显著.确定了泡沫微晶玻璃的最优烧成工艺制度为:烧结温度1050℃,发泡温度870℃,发泡时间35 min.优化烧成工艺制度下制备泡沫微晶玻璃试样的表观密度为450 kg/m3,抗压强度为6.84 MPa,导热系数为0.045 W/(m·K),吸水率为0.1％.     

利用工业固体废弃物制备微晶泡沫玻璃的研究现状及展望

工业固体废弃物在一定程度上属于可以重新利用的资源,其综合利用问题一直备受国内外学者关注.分析了利用工业固体废弃物制备微晶泡沫玻璃的可行性.综述了以粉煤灰、煤矸石、废玻璃、高炉渣、尾矿和油页岩渣等工业固体废弃物为原料制备微晶泡沫玻璃的国内外研究进展,以期为相关科学研究工作和工业化生产提供参考和借鉴.总结了目前利用工业固体废弃物制备微晶泡沫玻璃亟待解决的问题.     

烧结法制备粉煤灰微晶泡沫玻璃

利用粉煤灰通过烧结法制备了微晶泡沫玻璃。研究表明,选用碳酸钙作为发泡剂,最佳用量为5%。通过正交实验确定了最佳热处理条件:发泡温度1025℃、升温速率14℃/min、发泡时间30min。通过XRD和SEM研究了微晶泡沫玻璃的析出晶相和显微结构。主晶相为钙长石CaAl2Si2O8,次晶相为普通辉石Ca(Mg,Fe,Al)(Si,Al)2O6。所制得微晶泡沫玻璃综合性能优于泡沫玻璃和粘土砖。     

以油页岩渣为原料制备微晶泡沫玻璃

以油页岩渣为主要原料,加入其他辅助原料制备了微晶泡沫玻璃,并分析了各种因素对微晶泡沫玻璃性能的影响.结果表明,发泡剂碳酸钙和稳泡剂磷酸钠的最佳掺量为4%和6%;最佳的工艺条件为:发泡温度1080℃,发泡时间15 min,升温速率14℃/min.试样经过预热、烧结、发泡、稳泡和退火等热处理工艺,完成了发泡和析晶过程.其中发泡工艺需要较高温度,并在短时间内保温.XRD,SEM及FT-IR分析表明,试样已经完全转化为微晶泡沫玻璃,主晶相为普通辉石,次晶相为钙长石,晶体呈纤维状结构且相互交织.与相关材料比较,微晶泡沫玻璃具有机械强度高和质轻保温隔热的优点.     

利用玻璃析晶来制备新型材料

本文以微晶玻璃、微晶泡沫玻璃、结晶性封接玻璃、晶粒乳浊玻璃为实例系统地介绍了如何利用玻璃析晶这一缺陷来制备新型材料；详细地陈述了这几种玻璃目前研究的比较成熟的组成范围厦具体的制备方法。     

陶瓷-泡沫玻璃复合饰面保温装饰砖

介绍了以泡沫玻璃为保温层，以陶瓷墙地砖、纤维瓷板、微晶玻璃等为饰面层，以混合水泥浆为固化剂的复合饰面泡沫玻璃保温装饰砖的特点与应用。     

微晶泡沫玻璃的制备及力学性能研究

以废旧阴极射线管为主要原料,SiC为发泡剂,采用烧结法制备了微晶泡沫玻璃。通过DTA,XRD,SEM等分析手段,研究了发泡剂用量,升温速率,降温速率,保温时间对试样力学性能的影响。结果表明,所制备的微晶泡沫玻璃的主晶相为Pb,次晶相为Pb3O4,Al6Si2O13,抗压强度为6.28MPa,抗折强度为2.1MPa。     

Durable Glass-Ceramic Coatings for Foam Glass

This work describes the design and development of two new silica-based glass-ceramic coatings, suitable to be applied as slurries on a foam glass substrate. The coating process was optimized for both compositions, according to their sintering behavior. Scanning electron microscopy (SEM) observations and coefficient of thermal expansion (CTE) measurements revealed a good thermomechanical compatibility between the foam glass substrate and both coatings. The proposed coatings showed excellent chemical durability: no weight loss was observed after soaking in distilled water at 90°C for 16 days.     

Resorbability of a Bioglass®-based glass-ceramic scaffold produced via a powder metallurgy approach

Consolidation processes aimed at manufacturing cellular solids from bioglasses often result in a glass-ceramic microstructure, whose response to aqueous environment affects their performance. In this study, we evaluated the microstructure and the effect of crystallization on the dissolution mechanism of a Bioglass®-based glass-ceramic scaffold, produced with a powder metallurgy inspired technology. All the experiments are conducted in a controlled aqueous environment in order to avoid nucleation of different species or unknown chemical interactions between simulated body fluids and bioglass-ceramic material.The presence of a residual silica glass embedding different phases of not fully crystallized particles is highlighted, showing a complex multiscale structure elucidated via Focused Ion Beam (FIB) preparation and Scanning Transmission Electron Microscopy (STEM) observation. Crystalline and amorphous phases dissolved both in water, with different kinetics. The dissolution appears to be a surface phenomenon, which reduces the section of the foam struts without instability of the glass-ceramic material. Amorphization of crystalline phase is observed during immersion of the glass-ceramic material in stirring conditions at room temperature from the ions dissolved in water.     

Heat-Efficient Composite Wall Material

The effect of foam glass additives on the physicomechanical and thermophysical properties of construction ceramics is considered. The specifics of formation of a porous structure depending on the properties of source materials is investigated. A new glass-ceramic material with improved heat-insulating properties is obtained.__________Translated from Steklo i Keramika, No. 3, pp. 24 – 25, March, 2005.     

Crystallization-induced stabilization of foam glass aggregates for heat-insulating concrete

Resistance of the porous glass-based aggregates to alkali-silicate reaction (ASR) was the focus of this study. ASR was studied in mixtures of aggregates with water alkali solutions simulating alkali media of row concrete. Granular foam glass with homogeneous glass in the pore walls is ASR-active, which leads to the leaching of glass and to the formation of hydrated Na-silicate gel, Ca-silicate, and aluminosilicate on the aggregate surfaces. Mitigation of ASR-activity in granular foam glass was achieved by thermo-induced crystallization (850-900ºC) of micro- and nanoscale crystals (Na₄CaSi₃O₉ and/or Na₂Ca₃Si₆O₁₆) in the pore walls with the formation of granular glass-ceramic foams. The main characterization methods were scanning electron microscopy, x-ray powder diffraction analysis, x-ray fluorescence, atomic emission spectrometry, and pH analysis.     

Adsorption of Pb and Cd in rice husk and their immobilization in porous glass-ceramic structures

Rice husk, an agricultural waste, is abundantly available in many countries such as China, India, Brazil, US, and South East Asia. Despite the massive production of rice husk, it is mainly disposed to landfill. In this work, utilization of rice husk for a potential waste-water treatment is evaluated, along with subsequent encapsulation of the adsorbed heavy metals (Pb and Cd) inside a porous glass-ceramic. Vitrified bottom ash (another source of waste) was mixed with foaming agents in dif- ferent weight ratios (40:60, 50:50, and 60:40) to prepare a glass matrix for encapsulation of Pb-/Cd-loaded rice husk. It was shown that using 40 wt% vitrified bottom ash with 60 wt% foaming agents leads to a foam glass with the best pore size distribution. Therefore, this batch was further mixed with 70 volume% (5 wt%) heavy metal-loaded rice husk and was heat-treated at 750°C for 3 hours. The final glass-ceramic porous structure was char acterized using SEM, XRD, compression test, and it was shown that it is safe to be used as it passes the EN12457-2 leaching test.     

Strengthening of a lithium disilicate glass-ceramic by rapid cooling

In order to improve the mechanical properties, a traditional physical strengthening process was applied to a lithium disilicate (LD) glass-ceramic with a dual-phase microstructure consisting of a glassy matrix and LD crystals. The strengthening process was based on the transformation behavior of the glass-ceramic. The process was conducted by heating the glass-ceramic to a temperature below the dynamic softening point, and then rapid cooling in silicon oil (quenching). Residual stresses and mechanical properties of the glass-ceramic were investigated after the quenching. It was found that residual compressive macro-stresses could be induced in the surface layer of the LD glass-ceramic by the quenching. The residual stresses remarkably increased with increasing the quenching temperature to near the dynamic softening temperature. Compared with the corresponding annealing state, the LD glass-ceramic could be effectively strengthened and toughened by the quenching at a suitable temperature. The results displayed the strengthening possibility and potential of the LD glass-ceramic by the traditional physical process.     

矿渣微晶玻璃专家系统类比设计模型

类比学习是利用过去的经验来求解新问题的一种思维过程,是专家系统中实现知识自动获取的重要方法。根据矿渣微晶玻璃设计的基本特征,详细介绍了矿渣微晶玻璃类比设计的基本原理、类比因素以及类比准则。选择属性类比作为专家系统类比设计的主要方式,以矿渣的成分作为类比因素,以经过修正的综合类似度作为类比准则,结合矿渣微晶玻璃实例库和人工神经网络模型建立了专家系统类比设计模块。实验结果证明,该类比设计模块具有很好的设计效果,是矿渣微晶玻璃设计的有效方法之一。     

Sol-Gel法制备LAS微晶玻璃的研究现状与应用进展

LAS系统微晶玻璃由于其膨胀系数低,耐高温及抗热冲击性等优异性能而受到广泛重视。主要介绍了溶胶-凝胶制备过程及在LAS系微晶玻璃上的应用,简述了LAS系微晶玻璃的应用现状。