微晶玻璃／陶瓷复合墙地砖的研制

以接近陶瓷砖的成本生产具有微晶玻璃质量的新一代复合墙地砖是引人注目的课题。实验表明,将基础玻璃粉平铺于普通瓷质砖基板上,一起进行热处理,可制备出表层为微晶玻璃、基底为普通陶瓷的复合材料。它既具备微晶玻璃的各种优良特性和装饰效果,又可在普通陶瓷墙地砖厂通过适当技术改造来生产,具有很好的推广应用前景。     

粉煤灰微晶玻璃的研究进展

综合分析了国内外粉煤灰微晶玻璃的研究现状。综述了粉煤灰微晶玻璃的主要原料、原料配比、晶核剂的发展方向、制备工艺及复合型粉煤灰微晶玻璃的研究趋势及应用前景，作为一种新型绿色材料，粉煤灰微晶玻璃在建筑装饰领域将具有广阔的发展前号。     

粉煤灰微晶玻璃研究进展

综述了近年来国内外粉煤灰微晶玻璃的研究进展,包括粉煤灰微晶玻璃的主要原料、配方、制备工艺、晶核剂、粉煤灰微晶玻璃的复合化,并展望了粉煤灰微晶玻璃的研究发展方向。作为一种质优价廉的绿色环保材料,粉煤灰微晶玻璃具有广阔的发展前景。     

粉煤灰制备微晶玻璃研究进展

粉煤灰是大宗工业固体废弃物,也是宝贵的矿物资源.对利用粉煤灰制备微晶玻璃进行了综述,阐述了其制备原理、典型的制备方法以及研究进展.着重介绍了利用粉煤灰制备CaO-Al2O3-SiO2系和MgO-Al2O3-SiO2系微晶玻璃、泡沫微晶玻璃和微晶玻璃复合材料的研究进展及应用.利用粉煤灰合成微晶玻璃材料,不仅可以拓宽粉煤灰的综合利用途径,解决其环境污染问题;也可充分利用资源,制备性能优良的绿色建筑材料,具有十分重要的环境、经济和社会效益,但尚有技术瓶颈亟待突破.     

粉煤灰微晶玻璃的试验研究

本文以工业废弃物粉煤灰和废玻璃为主要原料,添加适量化学纯试剂,采用烧结法制备了CaO-Al2O3-SiO2系粉煤灰微晶玻璃。运用X射线衍射(XRD)对粉煤灰微晶玻璃进行了研究,并测试了粉煤灰微晶玻璃的密度。通过分析了粉煤灰添加量对微晶玻璃试样影响。实验结果表明:粉煤灰微晶玻璃的主晶相为硅灰石,次晶相为副硅灰石;粉煤灰添加量达到35%时,粉煤灰微晶玻璃性能最佳。     

烧结法制备粉煤灰微晶玻璃的实验研究

以粉煤灰为主要原料,采用烧结法制备粉煤灰建筑微晶玻璃.运用差热分析(DTA)、扫描电镜(SEM)、X射线衍射(XRD)等技术对粉煤灰微晶玻璃性能、微观结构进行了研究,并测试了粉煤灰微晶玻璃的物化力学性能.研究表明,粉煤灰微晶玻璃的主晶相为副硅灰石,副晶相为钙长石;CaO/SiO2为0.33时,微晶玻璃的理化力学性能达到最优,Al2O3/SiO2为0.19时,析晶过程相对最容易发生.     

热处理温度对矿渣微晶玻璃显微结构及耐腐蚀性的影响研究

以白云鄂博二次选后尾矿和粉煤灰为主要原料,采用熔融法制备微晶玻璃材料。通过DTA、XRD、SEM测试手段研究了热处理温度对微晶玻璃的显微结构及耐腐蚀性能的影响。研究表明:显微结构是影响微晶玻璃耐酸碱性能的主要因素。在860℃进行热处理时,普通辉石相细小晶粒均匀分布于基体玻璃中,耐酸碱性能最优,其中耐酸性99.8%,耐碱性99.7%,随着热处理温度的升高,微晶玻璃材料的耐酸碱性能均有一定提高,并且耐酸性高于耐碱性;均高于铸石制品,是良好的工业耐腐蚀材料。     

烧结粉煤灰微晶玻璃装饰板的研究

以粉煤灰为主要原料,采用烧结法制备粉煤灰微晶玻璃装饰板,并借助Ｘ射线衍射法鉴定材料的主晶相。测定了微晶玻璃的主要性能,研究了基础玻璃成分、热处理制度对烧结、晶化过程及样品外观的影响,确定了合理的玻璃成分范围和工艺制度。     

硅酸盐固体废弃物应用的研究进展Ⅰ——粉煤灰应用研究新成果

粉煤灰是典型的硅酸盐固体废弃物。对近年来以粉煤灰为主要原料制备矿物聚合材料、合成沸石、制备微晶玻璃与多孔陶瓷、制备复合催化材料、提取Al_2O_3和SiO_2以及粉煤灰用作环境材料、高分子材料填料的研究进展进行了综述,讨论了当前研究存在的主要问题和特点。已开展的新应用技术研究包括:大体量消耗粉煤灰应用技术(如粉煤灰矿物聚合材料),高附加值制品(如微晶玻璃、多孔陶瓷及β-sialon粉体)的工艺研究;发掘粉煤灰潜在的性能优势(如火山灰活性),有效利用化学组分(如粉煤灰提取Al_2O_3和SiO_2),进行表面改性及其复合加工技术;粉煤灰终端利用途经的研究(如高分子材料填料),以及清洁加工和循环利用工艺的探索(如用作环境材料)等。与传统的应用途经(如粉煤灰水泥、粉煤灰混凝土)相比,新应用技术还不够成熟,有待进一步开发研究,以加快新应用技术的规模化、工业化生产进程。     

利用低铝高烧失量粉煤灰制备微晶玻璃的研究

本文以低铝高烧失量粉煤灰为主要原料,采用高温融熔法制备粉煤灰微晶玻璃,粉煤灰的综合利用率可达60％以上.利用DTA分析了所制备基础玻璃的热效应,并据其制定了相应的热处理制度,采用XRD、SEM等检测方法对微晶玻璃试样的晶相种类和微晶结构进行分析研究,并测试了所制备微晶玻璃的抗弯强度等性能.实验表明,粉煤灰玻璃在800℃开始生成Ca5Al6O14晶体,升温至900℃开始有均匀分布的CaSiO3晶相出现,1000℃以上有显著的软化流动现象.所制备的微晶玻璃密度为2.79～2.96 9·cm-3、抗弯强度为112～125 MPa.     

Preparation of double-layer glass-ceramic/ceramic tile from bauxite tailings and red mud

Double-layer glass-ceramic/ceramic tiles made from bauxite tailings and red mud were prepared using a single firing powder processing route. The influence of the preparation method used for the green bodies on the microstructure and mechanical properties of the final products was investigated. The macroscopic appearance, microstructure, and mechanical properties indicated that the production of double-layer glass-ceramic/ceramic tiles may be an attractive method for recycling industrial waste into building materials.     

Technological properties of glass-ceramic tiles obtained using rice husk ash as silica precursor

This paper reports the results of a study focused on the obtainment of glass-ceramic by using rice husk ash (RHA) as silica precursor. RHA is a by-product generated in biomass plants using rice husk as fuel for kilns or in the rice mills to generate steam for the parboiling process. Worldwide, it is annually produced about 132 Mt of rice husk, which gives rise to a production of 33 Mt/year of RHA. Glass-ceramic tiles were produced by a sinter-crystallization process using a glassy frit formulated in the MgO–Al₂O₃-SiO₂ composition system. The realized glass-ceramics were studied according to ISO rules for sintering and technological properties (water absorption, apparent density, bending strength, Young's modulus, deep abrasion, Mohs hardness). To complete the investigation crystalline phase formation and microstructural characterization of the glass-ceramic materials was carried out using X-ray diffraction (XRD) and scanning electron microscopy (SEM). Finally, chemical durability tests on parent glass and derived glass-ceramics were performed. The results obtained showed that it is possible to use RHA to produce glass-ceramic tiles by a sinter-crystallization process, obtaining nepheline (Na₂O*Al₂O₃*SiO₂) as main crystalline phase and forsterite (2MgO*SiO₂) at 900 °C. Regarding technological features, the sintered materials showed bending strength values and Mohs hardness higher with respect to commercial glass-ceramics like NeopariesR. Other properties as water absorption (0.5%) allowed to classify these materials into the Group BIa characteristic of high sintered ceramic tiles according to European Standard rule.     

TiO2和ZrO2复合晶核剂对玻璃陶瓷晶化行为的影响

通过差热分析、X射线衍射分析和扫描电镜观察等测试方法,研究了TiO2和ZrO2作复合晶核剂对玻璃陶瓷晶化行为的影响。研究表明:适量的TiO2和ZrO2复合晶核剂能使MAS系统玻璃陶瓷的形核和析晶的温度降低,并且能促进析晶,晶核剂含量的调整也会对玻璃陶瓷的结构和性能产生较大的影响。     

大掺量粉煤灰用于胶凝材料制备研究

阐述了粉煤灰矿物组成、活性来源,对粉煤灰进行了复合优化处理,以改善其反应活性。胶砂强度实验结果表明在将其高掺量(50%)用于胶凝材料生产时,28天强度指标可满足42.5#水泥国家标准的强度要求,为粉煤灰的大宗利用提供了试验依据。     

Valorization of Al slag in the production of green ceramic tiles: Effect of experimental conditions on microstructure and crystalline phase composition

This work reports the results of an investigation aimed at the development of sintered glass-ceramic tiles by the sinter-crystallization of mixtures composed of aluminum slag and reclaimed packaging glass. The thermal behaviors of mixtures incorporating 50 and 60 wt% Al slag were established by differential thermal analysis (DTA). Green compacts were sintered in a temperature range of 800°C-1050°C and then soaked for 10-60 minutes. The mineralogical characterizations of the sintered materials were obtained by X-ray diffraction (XRD). The achieved results indicated that the sintering of aluminum slag and packaging glass reclaimed led to a glass-ceramic material composed mainly of needle-like crystals of wollastonite (CaSiO₃). The bloating of samples during firing was evaluated according to a Cougny predictive diagram. After initial observations and according to bending strength characterizations, sintered tiles prepared from aluminum slag and glassy sand are appropriate for floor pavement and wall covering.     

Utilization of Flyash as Filler Material in Hybrid Polyester Composites for Improved Thermo-Mechanical and Erosion Wear Behavior

The present work was carried out for the utilization of major quantities of flyash as filler material in the short fiber reinforced polyester resin composites in various engineering and structural applications. The incorporation of flyash modifies the hardness, tensile, flexural, impact and damping behavior of the composites. It is observed that hardness, flexural modulus and impact strength of flyash filled composites increases with increase in the flyash filler contents. Whereas, with the addition of flyash contents it is observed that there is decrease in tensile strength and flexural strength. But beyond the 10 wt.-% flyash filler addition in the composite the flexural strength increases. At the end, the erosion wear behavior of all the composites has been studied by Taguchi experimental design. It is found that unfilled glass polyester composite suffers greater erosion loss as compare to particulate filled glass polyester composites. The eroded surface morphology is examined by SEM and the related erosion wear mechanism is discussed in detail.     

玻纤、粉煤灰增强MC尼龙复合材料的研究

利用铸型尼龙(MC尼龙)静态浇铸的原理，通过阴离子聚合制得了玻纤、粉煤灰增强MC尼龙。研究了不同玻纤和粉煤灰质量分数对复合材料性能的影响。结果表明，用这种方法制得的玻纤、粉煤灰增强MC尼龙的机械性能较普通MC尼龙有较大幅度提高，纤维在基体中的分散性好，与基体的粘接性也相当好；加入30％玻璃纤维和10％粉煤灰可使复合材料的拉伸强度提高13．8％、弯曲强度提高32．8％、弯曲弹性模量提高110％、无缺口冲击韧性提高442％、而硬度提高49．6％。     

微晶玻璃-金属复合新型装饰材料

本文通过介绍新型装饰材料的发展趋势,对铝塑板、不锈钢金属、微晶玻璃等现有的新型装饰材料进行了分析比较,提出把微晶玻璃与金属复合作为装饰材料使用。最后详细阐述了这种材料的特点,并对其应用进行了展望。     

应用于低温共烧陶瓷元件的La2O3-B2O3-TiO2玻璃和BaNd2Ti5O14陶瓷基复合材料

由BaNd2Ti5O14陶瓷和无铅稀土硼玻璃(LBT)合成的玻璃陶瓷复合材料可以用于制备低温共烧陶瓷元器件(LTCC).本研究对这种玻璃陶瓷复合材料进行了检测,并分析探讨了它的相对密度、收缩率和微波介电特性(εr,Q×f0).低温烧结体呈现出可应用的特性,即相对密度高,超过85%,介电常数εr为13～20,Q×f0为2000～10000.结果显示,这种复合材料在制备高频低温共烧陶瓷元器件方面有很好的应用前景.