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Low-temperature sintering of ceramic bricks from clay, waste glass and sand 用粘土、废玻璃和沙子低温烧结陶瓷砖
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-09-01 DOI: 10.1016/j.bsecv.2024.06.003
In the present work, bricks were made on a real 1:1 scale for the construction of housing. For the preparation of the mixtures, raw materials such as clay, sand and glass obtained from the recycling of brown beer containers were used, applying the method plastic molding for the preparation of the semi-products. It has been established that the addition of sand containing a small amount of montmorillonite to such clay enabled to realization of plastic molding. The incorporation of glass into the clay provided to substantially reduce the sintering time of the bricks up to 8 h and to vary their strength properties. Sintering was carried out at 800 °C in an air atmosphere. The results of X-ray diffraction (XRD), X-ray fluorescence (XRF) and field emission scanning electron microscopy (FESEM) and EDS microanalysis have shown that the raw materials and ceramic bricks contains quartz and feldspars. Low-temperature sintering has made it possible to obtain high-quality, high-strength building bricks in accordance with standards.
在本作品中,砖块是按照 1:1 的真实比例制作的,用于建造住房。在制备混合物时,使用了从回收的棕色啤酒容器中获得的粘土、沙子和玻璃等原材料,并采用塑料成型法制备半成品。已经证实,在这种粘土中加入含有少量蒙脱石的沙子可以实现塑性成型。在粘土中加入玻璃可大大缩短砖块的烧结时间,最长可达 8 小时,并可改变其强度特性。烧结是在 800 °C 的空气环境中进行的。X 射线衍射(XRD)、X 射线荧光(XRF)、场发射扫描电子显微镜(FESEM)和 EDS 显微分析的结果表明,原材料和陶瓷砖含有石英和长石。低温烧结使获得符合标准的高质量、高强度建筑用砖成为可能。
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引用次数: 0
On the use of Afyon clay in Ukrainian clay-free compositions for porcelain tile manufacture 在乌克兰无粘土成分瓷片生产中使用阿菲永粘土
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-09-01 DOI: 10.1016/j.bsecv.2024.05.002
The conflict in Ukraine has meant that the supply of ball clay from this country has been cut off, giving rise to a serious setback for the manufacture of porcelain tile, as this raw material was a basic component for the formulation of this type of ceramic tile. This work proposes the use of a clay from the Afyon area in Turkey as an alternative, which is formed by a complex mixture of clay and non-clay minerals.
In the first part of the study, a complete characterisation of the clay has been carried out, comparing it with a standard Ukrainian clay. In a second part, a composition in which Afyon clay is the main clay component has been formulated and characterised in comparison with a standard composition formulated with Ukrainian clays. Overall, the results show that, although some properties for Afyon clay differ from those for Ukrainian clays, the behaviour of the proposed composition in the different stages of the process, milling/deflocculation, pressing and firing, is similar to that of the standard composition, thus adapting it to the requirements of industrial practice. This provides a feasible alternative way of replacing Ukrainian ball clays.
乌克兰的冲突意味着该国的球粘土供应已被切断,这给瓷质砖的生产带来了严重的挫折,因为这种原材料是配制这种瓷质砖的基本成分。这项研究建议使用土耳其阿菲永地区的一种粘土作为替代品,这种粘土是由粘土和非粘土矿物的复杂混合物组成的。在研究的第一部分,对这种粘土进行了全面的特性分析,并将其与标准的乌克兰粘土进行了比较。在第二部分中,对以阿菲永粘土为主要粘土成分的组合物进行了配制,并将其特征与用乌克兰粘土配制的标准组合物进行了比较。总之,研究结果表明,尽管阿菲永粘土的某些特性与乌克兰粘土不同,但所建议的成分在加工过程的不同阶段(研磨/去絮凝、压制和烧制)的表现与标准成分相似,因此能适应工业实践的要求。这为替代乌克兰球粘土提供了一种可行的替代方法。
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引用次数: 0
Spectroscopic insight into the structural and microstructural properties of La2Ce2O7 ceramics 通过光谱深入了解 La2Ce2O7 陶瓷的结构和微观结构特性
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-09-01 DOI: 10.1016/j.bsecv.2024.07.002
Ceria-based compounds with trivalent dopant ions are currently being investigated as electrolytes for solid oxide fuel cells operating at low to intermediate temperatures. In these materials, the dependence of the ionic conductivity on the dopant content, the relative cation size and the dopant/vacancy or vacancy/vacancy interactions are the subject of intense research, but there is scarce information about a possible correlation between these properties and microstructural ones, such as texture. Here, we address this question in the heavily doped fluorite-like La2Ce2O7 oxide, using a combination of X-ray diffraction, electron microscopy, optical absorption, Raman scattering and impedance spectroscopy. In all cases, materials with varying degree of 〈1 1 1〉 texture are compared with untextured samples. In this context, the most relevant Raman signatures are the fluorite-like mode at ∼448 cm−1 and a vacancy-related band at ∼578 cm−1. Although remarkable changes were observed upon varying the sintering temperature or the excitation wavelength, both textured and untextured materials displayed similar evolution. A selective enhancement of the vacancy-related band was observed upon decreasing the excitation wavelength from 647 to 488 nm, which is attributed to a resonance phenomenon involving vacancy-related electronic transitions. An indication of incipient vacancy ordering was given by the observation of an intense band at ∼346 cm−1, denoting C-R2O3-like short-range order; its enhancement with the annealing temperature is attributed to the growth of the C-like regions. Conductivity was measured in textured and untextured, fully dense pellets, in the former along and across the texture direction. Impedance plots suggest that the conductivity is dominated by oxide ions and do not allow to separate a grain boundary contribution in these materials with grain size around 1–2 μm. The conductivity amounts to around 10−5 S/cm at 650 K, with activation energy of 1.08–1.16 eV in the temperature range from around 470 to 870 K. Results were similar in textured and untextured materials. We conclude that there is no significant correlation between texture and vacancy concentration or vacancy ordering. A similar conclusion – no influence of texture – is reached concerning the electrical properties.
目前正在研究将含有三价掺杂离子的铈基化合物作为在中低温下工作的固体氧化物燃料电池的电解质。在这些材料中,离子电导率与掺杂剂含量、相对阳离子尺寸和掺杂剂/空位或空位/空位相互作用的关系是研究的热点,但有关这些特性与微观结构特性(如质地)之间可能存在的相关性的信息却很少。在此,我们结合使用 X 射线衍射、电子显微镜、光学吸收、拉曼散射和阻抗光谱,在重掺杂萤石类 La2Ce2O7 氧化物中解决了这一问题。在所有情况下,具有不同程度〈1 1 1〉纹理的材料都与无纹理样品进行了比较。在这种情况下,最相关的拉曼特征是 ∼448 cm-1 处的萤石样模式和 ∼578 cm-1 处的空位相关带。尽管在改变烧结温度或激发波长时观察到了明显的变化,但有纹理和无纹理材料都显示出类似的演变。当激发波长从 647 纳米降低到 488 纳米时,观察到空位相关带有选择性地增强,这归因于涉及空位相关电子跃迁的共振现象。在 ∼346 cm-1 处观察到一个强烈的条带,表示类似 C-R2O3 的短程有序,这表明了空位有序化的萌芽;它随退火温度的升高而增强,这归因于类似 C 区域的增长。在有纹理和无纹理、完全致密的颗粒中测量了前者沿纹理方向和跨纹理方向的电导率。阻抗图显示,导电性主要由氧化物离子主导,无法从这些晶粒尺寸约为 1-2 μm 的材料中分离出晶界的贡献。在 650 K 时,电导率约为 10-5 S/cm,在约 470 至 870 K 的温度范围内,活化能为 1.08-1.16 eV。我们得出结论:质地与空位浓度或空位排序之间没有明显的相关性。在电学特性方面,我们也得出了类似的结论--质地没有影响。
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引用次数: 0
Characterization of the dynamic properties of an automotive laminated glass ceiling 汽车夹层玻璃天花板的动态特性表征
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-09-01 DOI: 10.1016/j.bsecv.2024.05.001
This article presents a methodology for the characterization of the dynamic properties of a laminated glass automotive ceiling, motivated by the inherent difficulty in obtaining laboratory samples from this kind of components. This methodology is based on the identification of the effective complex modulus of the laminated glass ceiling through Experimental Modal Analysis in conjunction with a finite element model. Besides, a material behaviour model is proposed for the effective complex module. Then, the dynamic properties of the laminated glass core are extracted from the latter using a reverse homogenized formulation of sandwich plates specifically developed in this work. As a result, a methodology to accurately predict the dynamic behaviour of these key automotive components has been achieved. An additional advantage of this methodology is that the identification of properties is carried out from a manufactured component and not from samples of reduced geometries, considering the impact of the manufacturing process.
本文介绍了一种表征汽车夹层玻璃天花板动态特性的方法,这种方法的动机是由于从此类部件中获取实验室样本存在固有的困难。该方法的基础是通过实验模态分析和有限元模型确定夹层玻璃顶棚的有效复合模量。此外,还提出了有效复合模量的材料行为模型。然后,利用本研究中专门开发的夹层板反向均质化公式,从后者中提取夹层玻璃核心的动态特性。因此,准确预测这些关键汽车组件动态特性的方法得以实现。该方法的另一个优点是,考虑到制造过程的影响,属性识别是通过制造组件而不是缩小几何形状的样品来进行的。
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引用次数: 0
Basic microstructural, mechanical, electrical and optical characterisation of BaTiAl6O12 ceramics BaTiAl6O12 陶瓷的基本微观结构、机械、电气和光学特性分析
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-09-01 DOI: 10.1016/j.bsecv.2024.06.002
In progressive particle or layered composites based on a combination of BaTiO3 and Al2O3, serving as e.g. ceramic harvesters, new phases are formed during heat treatment. The dominant one is BaTiAl6O12. This study provides information about the microstructural, mechanical and optical properties of the BaTiAl6O12 ceramics. The evolution of the phases during the solid-state reaction synthesis of the BaTiAl6O12 was monitored. The fully dense samples prepared by spark plasma sintering had indentation Vickers hardness and indentation elastic modulus within ranges of 10.1–13.7 GPa and 132.0–187.0 GPa, depending on loading force. The three-point bending tests of the BaTiAl6O12 samples resulted in flexural strength of 129.9 MPa and fracture toughness of 1.8 MPa m1/2. The sample showed blue broad-band emission under UV excitation due to the charge-transfer transition of the Ti4+ and defect sites. The BaTiAl6O12 evinced low permittivity (ɛ′) = 16 and dielectric loss (tan δ) <0.0003 at a frequency 1 kHz.
在基于 BaTiO3 和 Al2O3 组合的渐进式颗粒或层状复合材料(如陶瓷收割机)中,在热处理过程中会形成新的相。其中最主要的是 BaTiAl6O12。这项研究提供了有关 BaTiAl6O12 陶瓷的微观结构、机械和光学特性的信息。在 BaTiAl6O12 的固态反应合成过程中,对相的演变进行了监测。通过火花等离子烧结制备的全致密样品的压痕维氏硬度和压痕弹性模量在 10.1-13.7 GPa 和 132.0-187.0 GPa 范围内,具体取决于加载力。BaTiAl6O12 样品的三点弯曲测试结果显示其抗弯强度为 129.9 兆帕,断裂韧性为 1.8 兆帕 m1/2。由于 Ti4+ 和缺陷位点的电荷转移转变,样品在紫外激发下显示出蓝色宽带发射。在频率为 1 kHz 时,BaTiAl6O12 的介电常数(ɛ′)= 16,介电损耗(tan δ)<0.0003。
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引用次数: 0
Inteligencia artificial y materiales 人工智能与材料
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-09-01 DOI: 10.1016/j.bsecv.2024.10.003
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引用次数: 0
α/β-TCP silicate glass-ceramic obtained by sol–gel: Structure and in vitro bioactivity 通过溶胶-凝胶法获得的 α/β-TCP 硅酸盐玻璃陶瓷:结构和体外生物活性
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-09-01 DOI: 10.1016/j.bsecv.2024.04.002
A glass-ceramic in the CaO–P2O5–SiO2 system, which contains two polymorphic modifications of tricalcium phosphate – whitlockite, β-Ca3(PO4)2 and α-Ca3(PO4)2, has been synthesized by the sol–gel method and thermal treatment up to 1200 °C. The phase composition and microstructure of the glass-ceramic were investigated with X-ray diffraction analysis (XRD), Fourier-transformed infrared spectroscopy (FTIR), scanning electron microscopy and energy dispersive spectroscopy (SEM-EDS). An in vitro bioactivity test of the glass-ceramic in a simulated body fluid (SBF) was conducted for up to 21 days. α-Ca3(PO4) dissolved almost completely in SBF after 7 days. The experimental results of XRD, FTIR, SEM and EDS clearly validated the ability of the glass-ceramic samples to form a layer of hydroxyapatite on their surface in an SBF environment. We also studied the cytotoxic effect of the glass-ceramic on murine bone marrow (BM) cells and pre-osteoclasts in vitro. The glass-ceramic reduced the viability of BM cells in a dose-dependent manner being less toxic at concentrations below 0.1 mg/ml. It modestly affected the viability of pre-osteoclasts cultured in osteoclast differentiation media. The obtained sample increased the percentage of pre-osteoclasts expressing the receptors involved in osteoclastogenesis (RANK) and apoptosis (TRAIL). In conclusion, the glass-ceramic showed the potential to affect the survival/differentiation of pre-osteoclasts at early stage of osteoclastogenesis. It might be suitable for tissue engineering including implants coating or scaffold as it can interfere with early stage of osteoclastogenesis which is required for proper bone remodelling and repair upon a long-term application of biomaterials.
通过溶胶-凝胶法合成了一种 CaO-P2O5-SiO2 系的玻璃陶瓷,其中包含磷酸三钙的两种多晶型变体--白锁石、β-Ca3(PO4)2 和 α-Ca3(PO4)2,热处理温度高达 1200 °C。利用 X 射线衍射分析(XRD)、傅立叶变换红外光谱(FTIR)、扫描电子显微镜和能量色散光谱(SEM-EDS)对玻璃陶瓷的相组成和微观结构进行了研究。在模拟体液(SBF)中对玻璃陶瓷进行了长达 21 天的体外生物活性测试,7 天后,α-Ca3(PO4) 几乎完全溶解在 SBF 中。XRD、傅立叶变换红外光谱、扫描电镜和 EDS 的实验结果清楚地验证了玻璃陶瓷样品在 SBF 环境中能够在其表面形成一层羟基磷灰石。我们还在体外研究了玻璃陶瓷对小鼠骨髓(BM)细胞和前破骨细胞的细胞毒性作用。玻璃陶瓷以剂量依赖的方式降低了骨髓细胞的活力,当浓度低于 0.1 毫克/毫升时,玻璃陶瓷的毒性较低。它对在破骨细胞分化培养基中培养的前破骨细胞的活力影响不大。获得的样品增加了表达破骨细胞生成受体(RANK)和凋亡受体(TRAIL)的前破骨细胞的百分比。总之,在破骨细胞生成的早期阶段,玻璃陶瓷显示出影响前破骨细胞存活/分化的潜力。它可能适用于包括植入物涂层或支架在内的组织工程,因为它可以干扰破骨细胞生成的早期阶段,而破骨细胞生成是生物材料长期应用后进行适当骨重塑和修复所必需的。
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引用次数: 0
Synthesis and characterization of B-type carbonated hydroxyapatite materials: Effect of carbonate content on mechanical strength and in vitro degradation B 型碳化羟基磷灰石材料的合成与表征:碳酸盐含量对机械强度和体外降解的影响
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-07-01 DOI: 10.1016/j.bsecv.2023.12.001

The current approach in bone tissue engineering requires resorbable biomaterials that enhance bone formation while maintaining sufficient mechanical stability. In this work, the influence of three levels of B-type carbonate substitution in hydroxyapatite lattice on mechanical strength and degradation rate is analyzed. The inverse aqueous route has been selected as a synthesis method of four powders with carbonate substitution between 4 and 6 wt.%. X-ray fluorescence (XRF), (C-S)-Analysis, FT-Infrared, X-ray diffraction, DTA-TG and TEM were used to investigate chemical composition, type of substitution, thermal behaviour, and morphology of the powders. Disc shaped specimens were processed by uniaxial pressing and sintering in argon/CO2 flow. Maximum temperatures of thermal treatment between 750 and 850 °C were selected to obtain similar porosity levels for the different compositions. The highest carbonate substituted material (5.3 wt.%) presented higher compressive strength and dissolution rate than the other materials showing the beneficial effect of B-type substitution in hydroxyapatite materials for bone repair.

目前的骨组织工程方法要求可吸收生物材料既能促进骨形成,又能保持足够的机械稳定性。本研究分析了羟基磷灰石晶格中三种程度的 B 型碳酸盐取代对机械强度和降解率的影响。四种碳酸盐取代度介于 4 至 6 wt.% 之间的粉末的合成方法均选择了反向水溶液路线。利用 X 射线荧光 (XRF)、(C-S)分析、傅立叶变换红外光谱、X 射线衍射、DTA-TG 和 TEM 来研究粉末的化学成分、替代类型、热性能和形态。圆盘状试样在氩气/二氧化碳气流中进行单轴压制和烧结处理。热处理的最高温度选择在 750 至 850 ℃ 之间,以获得不同成分的相似孔隙率水平。碳酸盐取代度最高的材料(5.3 wt.%)比其他材料具有更高的抗压强度和溶解率,这表明羟基磷灰石材料中的 B 型取代对骨修复具有有利影响。
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引用次数: 0
Actualización de los datos bibliométricos de la revista 更新期刊的文献计量数据
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-07-01 DOI: 10.1016/j.bsecv.2024.07.005
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引用次数: 0
Análisis de la transformación del caolín de Hidalgo en zeolita cancrinita y fases secundarias por el método hidrotermal 利用水热法分析伊达尔戈高岭土向方解石沸石和次生相的转化过程
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-07-01 DOI: 10.1016/j.bsecv.2024.02.002

This study investigated the transformation of cancrinite-type zeolite, together with secondary phases, in a hydrothermal system. The mineral kaolin and NaOH were used as precursors under self-generated pressure at 140 °C, varying the reaction time at intervals of 0 to 10 hours. The kaolin, the main precursor, was subjected to X-ray diffraction (XRD), elemental chemical composition (XRF) and Fourier Transform IR Spectroscopy (FT-IR) analyses. The resulting solids were characterized by XRD. Initially, crystalline phases such as Na-P2 zeolites, gismondine, analcime, natrolite and sodalite were formed, but with time they became unstable and dissolved to form new phases. At 8 hours of reaction, the cancrinite zeolite predominated, fulfilling the main objective of the study. The solid material was analyzed by scanning electron microscopy (SEM) and FT-IR. The behavior of Na, Si and Al in the solutions was evaluated over time by inductre coupled plasma (ICP). It was conclusively demonstrated that kaolin from Hidalgo is a feasible precursor to synthesize zeolites, cancrinite type as predominant phase in 8 hours at 140 °C, using moderate concentrations of NaOH.

本研究探讨了在水热系统中,方解石型沸石连同次生相的转化过程。以矿物高岭土和 NaOH 为前驱体,在 140 ℃ 的自生压力下进行反应,每隔 0 到 10 小时改变一次反应时间。对主要前驱体高岭土进行了 X 射线衍射(XRD)、元素化学成分(XRF)和傅立叶变换红外光谱(FT-IR)分析。X 射线衍射对所得到的固体进行了表征。最初形成的结晶相包括 Na-P2 沸石、吉斯蒙德石、芒硝、钠长石和钠长石,但随着时间的推移,这些结晶相变得不稳定,并溶解形成新的结晶相。反应 8 小时后,主要形成的是康氏沸石,达到了研究的主要目的。固体材料通过扫描电子显微镜(SEM)和傅立叶变换红外光谱(FT-IR)进行了分析。通过电感耦合等离子体 (ICP) 评估了溶液中 Na、Si 和 Al 随时间的变化情况。最终结果表明,伊达尔戈的高岭土是一种可行的前驱体,使用中等浓度的 NaOH,在 140 ℃ 下 8 小时内就能合成沸石,主要相为针状沸石。
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引用次数: 0
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Boletin de la Sociedad Espanola de Ceramica y Vidrio
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