高炉矿渣微晶玻璃的研制

以高炉矿渣为主要原料,加入适量辅助原料,经过熔融、热态浇注成形得到基础玻璃,对其应用两级热处理工艺,获得主晶相为硅灰石的矿渣微晶玻璃.并运用DTA、SEM分析技术确定矿渣微晶玻璃的核化、晶化温度及矿物组成,比较热处理前后样品的微观结构.结果表明:以硅灰石为主晶相的矿渣微晶玻璃,其结构均匀致密、机械性能良好.     

热处理工艺对高炉矿渣微晶玻璃性能的影响

以某高炉矿渣为主要原料,采用熔融法制备了CaO-Al_2O_3-SiO_2系矿渣微晶玻璃。研究了热处理工艺对矿渣微晶玻璃力学性能的影响,得出热处理工艺影响因素的先后顺序为:核化温度-核化时间-晶化时间-晶化温度,确定最佳热处理工艺为:770℃核化3 h,930℃晶化2 h,在此热工艺条件下制备的微晶玻璃抗弯强度最大,为153.67 MPa。利用X射线衍射(XRD)、扫描电镜(SEM)、能谱(EDS)测试方法分析了矿渣微晶玻璃的显微结构和晶体微观结构。     

矿渣微晶玻璃的制备及展望

本文介绍了制备矿渣微晶玻璃的方法-熔融法和烧结法，总结了两种方法各自的优缺点，综述了基础玻璃的组成和晶核剂对制备矿渣微晶玻璃的主晶相及性能的影响；从矿渣微晶玻璃现状出发，展望了矿渣微晶玻璃的未来发展。     

矿渣微晶玻璃的制备及展望

介绍了制备矿渣微晶玻璃的方法-熔融法和烧结法，总结了两种方法各自的优点及存在的问题，着重综述了基础玻璃的组成和晶核剂对制备矿渣微晶玻璃的主晶相及性能的影响；从矿渣微晶玻璃现状出发，展望了矿渣微晶玻璃的未来发展趋势。     

矿渣微晶玻璃热处理制度的优化设计

以白云鄂博矿二次选后尾矿、粉煤灰和石灰石为主要原料,采用熔融法制得矿渣微晶玻璃.利用正交实验方法研究了热处理工艺参数对矿渣微晶玻璃抗弯强度的影响,得到影响因素的主次顺序为:晶化时间＞核化温度＞晶化温度＞核化时间,确定最优热处理制度为:核化温度700℃,核化时间2h;晶化温度850℃,晶化化时间2h.并利用XRD、SEM、EDS检测手段对制得的微晶玻璃显微结构进行了分析.     

冀微晶玻璃生产线国际领先

河北晶牛集团年产１０万平方米矿渣微晶玻璃生产线,各项技术性能均居国际领先水平。压延微晶玻璃是以废弃矿渣为主要原料,经高温熔化、压延成型、晶化退火而成的耐磨、耐腐蚀、耐高温、无放射性污染的工业材料和绿色建筑材料。冀微晶玻璃生产线国际领先     

SiO2含量对钛矿渣微晶玻璃晶化行为的影响

以钛矿渣为主要原料,采用熔融法制备CaO-MgO-Al₂O₃-SiO₂系微晶玻璃,通过综合热分析仪、X射线衍射仪和扫描电子显微镜分析了SiO₂含量对钛矿渣微晶玻璃的基础玻璃稳定性及晶化行为的影响。结果显示:以原渣制备微晶玻璃时,其基础玻璃结构不稳定,易析出钙钛矿晶体,随着SiO₂含量的增加,基础玻璃趋于稳定,析晶温度上升,热处理后析晶程度更高,显微结构更加致密,因而强度更高。通过加入辅助原料石英粉来调节SiO₂含量,当SiO₂含量为40%(质量分数)时,可以制备出具有稳定玻璃体、晶相仅为透辉石、抗弯强度为82.1 MPa的微晶玻璃,其钛矿渣掺量在80%(质量分数)以上,具有重要的经济与社会效应。     

矿渣微晶玻璃技术的开发

本阐述了以钢铁厂高炉矿渣为主要原料,生产微晶玻璃的技术,应用岩相分析和电子探针技术对矿渣微晶玻璃的微观结构、晶相组成及形态进行了分析。探讨了玻璃特性、热处理工艺对结构及性能的影响,微晶玻璃抛光表面气孔产生的原因及解决措施。     

压延法矿渣微晶玻璃成分的研究

探讨了使用压延法制备高炉矿渣微晶玻璃的成分范围、主晶相的选择以及晶核剂的选择和使用等问题,获得了工艺性能优良、可供工业化连续压延生产的矿渣微晶玻璃的配方范围.     

压延法同晶玻璃成分的研究

探讨了使用压延法制备高炉矿渣微晶玻璃的成分范围、主晶相的选择及晶核剂的选择和使用等问题,获得了工艺性能优良、可供工业化连续夺延生产的矿渣微晶玻璃的西方范围。     

Conventional and electric field-assisted ion exchange on glass-ceramics for dental applications

Ion exchange can be used to mechanically reinforce dental glass-ceramics to reduce the problems associated to the flaws created upon various processing steps and handling. This work introduces a novel ion exchange method to the field of dental glass-ceramic to increase the possibilities of preparing highly reliable glass-ceramic restorations. The aim of the study was to compare Electric Field-Assisted Ion Exchange with conventional method, for newly developed nepheline based dental glass-ceramic. Multicomponent glass system was synthesized using melt-quench method and then prepared into glass-ceramic specimens via powder sinter-crystallisation route. The prepared glass-ceramic specimens were tested for bi-axial flexural strength before and after ion exchange according to the dental ceramics ISO 6872:2015. Ion exchange process was carried out in molten potassium nitride and the potassium penetration depth determined by EDXS was found greater and occurring in a matter of minutes within the nepheline crystal structure during electrical field assisted ion exchange compared with several hours of conventional treatment. The newly developed nepheline glass-ceramic system and the results achieved by electrical field assisted ion exchange may renew the ion exchange concept for dental application.     

微晶玻璃釉的研究

用不同组成的微晶玻璃水淬料,施于陶瓷坯上经核化、晶化,同时完成烧成,而获得微晶玻璃釉层.其工艺制度可以结合DTA分析,通过实验来确定.微晶玻璃釉要和坯料相匹配:釉和坯的膨胀系数相近,微晶玻璃的晶化温度和坯的烧成温度要相一致.     

In Situ Whisker-Reinforced AlPO4-Modified β-Eucryptite Glass-Ceramic: I, Morphology and Crystallization Kinetics

A whisker-reinforced glass-ceramic composite in the Li₂O-Al₂O₃-SiO₂-P₂O₅ system has been fabricated by a single-stage process that simultaneously forms the glass-ceramic material and whiskers of TiO₂ in situ . The method utilizes typical glass-ceramic processing techniques and requires precise addition of a TiO₂ nucleation agent during the glass-melting operation, followed by controlled nucleation and crystallization. The maximum nucleation temperature, 740°C, was determined by differential thermal analysis (DTA), and the result was confirmed by scanning electron microscopy (SEM) of the microstructures formed by nucleation/isothermal crystallization heat treatments. The apparent activation energy for crystallization of the material was determined to be 285 ± 3 kj/mol. The average aspect ratio of the TiO₂ whiskers depends on temperature and time during crystallization. The X-ray diffraction patterns of the in situ composite show that eucryptite(ss) and rutile exist as two different phases; no additional phases were observed. Elemental X-ray mapping by electron microprobe indicates that these highly crystallized composites consist of modified β-eucryptite glass-ceramic matrix and acicular grains of TiO₂.     

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.     

Bioactivity of Zirconia-Toughened Glass-Ceramics

Bioactivity of zirconia-toughened glass-ceramic composites was evaluated by their surface reaction in simulated body fluid and the bonding strength to living bone. The composite containing 30 vol% zirconia showed high bioactivity, whereas that containing 50 vol% zirconia, extremely low. TEM observation indicated that Ca in the glass-ceramic particles reacted with the zirconia during sintering. It was found that the decrease in Ca in the particles degraded the bioactivity of the composite. In this study, the optimum composition was determined for high-strength and bioactive ceramic.     

Laser induced crystallization in lithium borate-bismuth tungstate glass-ceramic for photocatalytic dye degradation

This research presents the first study on laser-induced crystallization to prepare glass-ceramics for water-cleaning applications. In previous reports, glass crystallization was accomplished through heat treatment at a specific temperature determined by performing differential scanning calorimetry (DSC). The new method proposed in this study offers advantages in terms of speed, control, less damage, less contamination, and miniaturization for the crystallization of glass-ceramics. Lithium borate-bismuth tungstate glasses were prepared using the conventional melt-quench technique and then crystallized using a laser power source. The resulting glass-ceramic was analyzed using X-ray diffraction (XRD) and Raman spectroscopy to determine its structure and phase, while field-emission scanning electron microscopy (FE-SEM) was used to examine its morphology. The band gap of the glass-ceramic was determined to be 2.8 eV using UV–vis spectroscopy. The photocatalytic degradation of methylene blue dye (MB) was used as a model, achieving 65% degradation within 240 min of visible light irradiation.     

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。     

Bioactive glass-ceramics prepared by powder sintering and crystallization of polyphosphate glass containing strontium

Melt-quenching method was employed for obtaining a glass-ceramic with the following composition 42P₂O₅·40CaO·5SrO·10Na₂O·3TiO₂ (mol%) glass. The crystallization and sintering behavior of glass have been studied by using DTA, HSM, XRD, FTIR and SEM methods. It was determined that the surface and volume crystallization mechanisms act simultaneously in bulk glass samples. The comparison of DTA and HSM data revealed that the sintering and crystallization processes are independent. The sintered calcium phosphate glass-ceramic which contained bioactive β-Ca₃(PO₄)₂ and β-Ca₂P₂O₇ phases was successfully prepared. It was determined that during crystallization the primary phase in the precipitate was β-Ca(PO₃)_2. Other phases appearing in the resulting glass-ceramic were: α-Ca₂P₂O₇, γ-Ca₂P₂O₇, Ca₄P₆O₁₉ and CaHPO₄(H₂O)₂. Crystalline phases containing Sr and Ti were not detected. SEM analysis of the glass-ceramic microstructure revealed surface crystallization of glass particles and plate-like morphology of crystal growth. The result of the in vitro bioactivity showed that no apatite layer was formed on the surface of the as-prepared glass-ceramic samples after immersion in the simulated body fluid (SBF).     

Glass-Ceramic Protective Coating for Titanium Alloys

A glass-ceramic coating that protects a titanium alloy against oxidation during heat treatment has been successfully developed. In the present study, the conditions for preparing this glass-ceramic coating were investigated. In addition, the prepared coating was characterized by X-ray diffractometry, energy-dispersive spectroscopy analysis, and oxygen weight-gain testing. The results showed that the glass-ceramic coating has excellent oxygen-proof properties to protect the titanium alloy from oxidation by the atmosphere at high temperature (900°C).