International Journal of Applied Ceramic Technology最新文献_第4页

Properties of tartaric acid modified steel slag as supplementing cementitious materials 酒石酸改性钢渣作为水泥基补充材料的性能

IF 2.1 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Ceramic Technology

Pub Date : 2024-07-26 DOI: 10.1111/ijac.14872

Panpan Tang, Yangkai Xiong, Lei Huang, Zhiqiang Fang, Hao Jiang, Guoqing Wang

By using tartaric acid (TA) as a wet‐method modifier to modify steel slag powder (SS), it is helpful to reduce the content of free calcium oxide (f‐CaO) in SS and further improve the mechanical properties and soundness of SS as supplementing cementitious materials (SCM) in the mortar. The results indicate that with the addition of 2 wt% of TA, the number of large particles bigger than 45 µm in the SS decreased, resulting in predominantly smaller particles smaller than 45 µm. While the specific surface area increased from 417 to 704 m2/kg, the water consumption at standard consistency was significantly reduced. The soundness of the paste SS as SCM had improved including the f‐CaO content decreased from 4.81% to 0.95%, and the Le Chatelier expansion reduced from 4.5 to 1.5 mm. The mechanical properties were significantly enhanced, with the flexural strength increasing from 5.6 to 7.8 MPa, and the compressive strength rising from 38.8 to 52.7 MPa. After 28 days of curing in water, the hydration products of the mortar are hydrated calcium silicate (C‐S‐H), calcium hydroxide (CH), and calcium carbonate (CaCO3).

使用酒石酸（TA）作为湿法改性剂对钢渣粉（SS）进行改性，有助于降低钢渣粉中游离氧化钙（f-CaO）的含量，并进一步改善钢渣粉作为砂浆中胶凝材料（SCM）的力学性能和密实性。结果表明，添加 2 wt% 的 TA 后，SS 中大于 45 µm 的大颗粒数量减少，主要是小于 45 µm 的小颗粒。虽然比表面积从 417 m2/kg 增加到 704 m2/kg，但标准稠度下的耗水量却显著减少。作为 SCM 的糊状 SS 的稳固性得到了改善，包括 f-CaO 含量从 4.81% 降至 0.95%，勒夏特列膨胀率从 4.5 mm 降至 1.5 mm。机械性能明显提高，抗折强度从 5.6 兆帕提高到 7.8 兆帕，抗压强度从 38.8 兆帕提高到 52.7 兆帕。在水中固化 28 天后，砂浆的水化产物为水合硅酸钙（C-S-H）、氢氧化钙（CH）和碳酸钙（CaCO3）。

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引用次数: 0

Study on reaction interface of carbon‐free oxide‐based refractories with lanthanum oxide and lanthanum aluminate 无碳氧化物基耐火材料与氧化镧和铝酸镧的反应界面研究

IF 2.1 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Ceramic Technology

Pub Date : 2024-07-26 DOI: 10.1111/ijac.14873

Feixiang Ma, Guoqi Liu, Qiang Gu, Yi Zhang, Hongxia Li

In this study, the reaction interfaces of four kinds of oxide refractories (corundum, spinel, mullite, and zirconia) with lanthanum oxide (La2O3) and lanthanum aluminate (LaAlO3) under different atmospheres at high temperatures (1550°C) were analyzed. The results show that the four oxides have a strong reaction with La2O3, and the corresponding rare earth aluminate, rare earth silicate, and rare earth zirconate are formed respectively. The reaction with LaAlO3 is weak, and almost no reaction occurs. Mullite has poor structural stability in a high‐temperature reduction atmosphere, easy decomposition, and strong reaction with La2O3. This study provides an important reference for the study of the reaction mechanism between rare earth steel and lining materials and the research and development of special lining materials for rare earth steel.

本研究分析了四种氧化物耐火材料（刚玉、尖晶石、莫来石和氧化锆）在不同气氛下与氧化镧（La2O3）和铝酸镧（LaAlO3）在高温（1550°C）下的反应界面。结果表明，四种氧化物与 La2O3 发生强烈反应，分别生成相应的稀土铝酸盐、稀土硅酸盐和稀土锆酸盐。与 LaAlO3 的反应较弱，几乎不发生反应。莫来石在高温还原气氛中结构稳定性差，易分解，与 La2O3 反应强烈。该研究为研究稀土钢与衬里材料的反应机理、研发稀土钢专用衬里材料提供了重要参考。

引用次数: 0

Dynamic bending analysis of metallized silicon nitride substrate during thermal cycling via digital image correlation 通过数字图像关联分析氮化硅金属化基板在热循环过程中的动态弯曲情况

IF 2.1 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Ceramic Technology

Pub Date : 2024-07-23 DOI: 10.1111/ijac.14875

Minh Chu Ngo, Hiroyuki Miyazaki, Kiyoshi Hirao, Tatsuki Ohji, Manabu Fukushima

Digital image correlation (DIC) method was employed to analyze the dynamic bending of a metallized Si3N4 substrate in thermal cycles ranging from −40°C to 250°C. The substrate was monitored by DIC over several consecutive cycles, spanning from 0 to 2501. Three DIC measurement intervals, specifically during 999–1001, 1999–2001, and 2499–2501 cycles, were selected to analyze the bending behavior in response to temperature fluctuations. By the scanning acoustic microscope (SAM), the substrate revealed negligible delamination after 1001 cycles, light delamination after 2001 cycles, and serious delamination post‐2501 cycles. The dynamic bending remained unchanged during 999–1001 cycles. A curve with a negative bending was observed during 1999–2001 cycles, with a peak curvature of .024 mm−1 at −40°C; the negative bending intensified with a curvature reaching .050 mm−1 at −40°C during 2499–2501 cycles. The bending curve then decreased during the heating phase and returned to a non‐bent state at elevated temperatures. The bending curve reversed to positive at 250°C during thermal cycles from 2499 to 2501. The bending behavior throughout thermal cycles was discussed in relation to the asymmetric delamination observed on both sides of the substrate, as well as the distribution of delamination.

采用数字图像相关（DIC）方法分析了金属化 Si3N4 衬底在 -40°C 至 250°C 的热循环中的动态弯曲情况。基片在 0 至 2501 的几个连续循环中受到 DIC 的监测。选择了三个 DIC 测量间隔，特别是在 999-1001、1999-2001 和 2499-2501 个循环期间，以分析弯曲行为对温度波动的响应。通过扫描声学显微镜 (SAM)，基底在 1001 次循环后出现可忽略不计的分层，2001 次循环后出现轻度分层，2501 次循环后出现严重分层。在 999-1001 次循环期间，动态弯曲保持不变。在 1999-2001 次循环期间，观察到一条负弯曲曲线，在 -40°C 时的曲率峰值为 0.024 mm-1；在 2499-2501 次循环期间，负弯曲加剧，在 -40°C 时的曲率达到 0.050 mm-1。在加热阶段，弯曲曲线随之减小，并在高温下恢复到无弯曲状态。在 2499 至 2501 次热循环期间，弯曲曲线在 250°C 时反转为正值。讨论了整个热循环期间的弯曲行为与基材两侧观察到的不对称分层以及分层分布的关系。

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引用次数: 0

Sea/coral sand in marine engineered geopolymer composites: Engineering, mechanical, and microstructure properties 海洋工程土工聚合物复合材料中的海砂/珊瑚砂：工程、机械和微观结构特性

IF 2.1 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Ceramic Technology

Pub Date : 2024-07-23 DOI: 10.1111/ijac.14874

Xiaochun Fan, Jiakun Zhu, Xu Gao

Utilizing marine waste and resources for eco‐friendly building materials is pivotal in promoting sustainable development in island and coastal construction industries. Among the potential alternatives, coral sand as well as sea sand stands out as a promising material. This research seeks to explore the potential of coral/sea sand as a fine aggregate in the creation of environmentally sustainable marine engineered geopolymer composites. An assessment was conducted on the influence of varying proportions of coral sand, meant as a substitute for sea sand, on the flowability, drying shrinkage, mechanical properties, and microstructure of the marine engineered geopolymer composites. The findings indicate that as coral sand replaces sea sand, flowability and drying shrinkage decrease, while compressive strength experiences an initial rise followed by a decline. Encouragingly, a combination of coral and sea sands enhances tensile ductility. Overall, a 20 wt.% coral sand mixture yields optimal results, with the compressive strength is 54.4 Mpa and the tensile strain capacity is 2.397% after 28 days. Moreover, microscopic tests reveal changes in hydration products and pore structure. Our research delves into the potential of coral/sea sand as a fine aggregate in the creation of environmentally sustainable marine engineered geopolymer composites.

利用海洋废弃物和资源制作生态友好型建筑材料，对于促进岛屿和沿海建筑业的可持续发展至关重要。在潜在的替代材料中，珊瑚砂和海砂是最有前途的材料。本研究旨在探索珊瑚砂/海砂作为精细骨料在制造环境可持续海洋工程土工聚合物复合材料方面的潜力。研究评估了作为海砂替代品的珊瑚砂的不同比例对海洋工程土工聚合物复合材料的流动性、干燥收缩率、机械性能和微观结构的影响。研究结果表明，珊瑚砂替代海砂后，流动性和干燥收缩率降低，而抗压强度则先上升后下降。令人鼓舞的是，珊瑚砂和海砂的组合增强了拉伸延展性。总体而言，20 wt.%的珊瑚砂混合物能产生最佳效果，28 天后的抗压强度为 54.4 Mpa，拉伸应变能力为 2.397%。此外，显微测试显示了水化产物和孔隙结构的变化。我们的研究深入探讨了珊瑚/海砂作为精细骨料在制造环境可持续的海洋工程土工聚合物复合材料方面的潜力。

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引用次数: 0

Modification of liquid phase and microstructure of sintered mullite by different additives 不同添加剂对烧结莫来石液相和微观结构的改变

IF 2.1 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Ceramic Technology

Pub Date : 2024-07-19 DOI: 10.1111/ijac.14860

Yaxuan Wang, Junzhan Zhang, Jianying Gao, Zhaopeng Yang

In the field of ceramics, mullite has drawn plenty of attention due to its low thermal expansion and thermal conductivity as well as its high chemical stability and creep resistance. This work reported the mineral phase, liquid phase, and microstructure evolution of the sintered mullite, using coal‐series kaolin as the raw material and potash feldspar as well as phosphorus pentoxide as additives. The effects of K2O and P2O5 on the content and viscosity of the liquid phase in mullite were calculated using FactSage 8.1. The results showed that the introduction of K2O could inhibit the formation of cristobalite effectively. Adding K2O and P2O5 improved the content of the liquid phase formed during the calcination process. After introducing K2O and P2O5, mullite developed acicular and columnar structures, with average lengths of 9.76 and 7.97 µm, respectively. Furthermore, introducing K2O and P2O5 improved the physical properties of mullite significantly.

在陶瓷领域，莫来石因其热膨胀率低、热导率高、化学稳定性和抗蠕变性强而备受关注。本研究以煤系高岭土为原料，以钾长石和五氧化二磷为添加剂，研究了烧结莫来石的矿物相、液相和微观结构演变。使用 FactSage 8.1 计算了 K2O 和 P2O5 对莫来石中液相含量和粘度的影响。结果表明，K2O 的引入能有效抑制嵴钙钛矿的形成。添加 K2O 和 P2O5 提高了煅烧过程中形成的液相的含量。引入 K2O 和 P2O5 后，莫来石形成了针状和柱状结构，平均长度分别为 9.76 微米和 7.97 微米。此外，引入 K2O 和 P2O5 还显著改善了莫来石的物理性质。

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引用次数: 0

Ceramic materials as an alternative for conventional spark plug electrodes 陶瓷材料作为传统火花塞电极的替代品

IF 1.8 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Ceramic Technology

Pub Date : 2024-07-19 DOI: 10.1111/ijac.14865

Walter Harrer, Manuel Gruber, Verena Melcher, Anton Tilz, Michael Engelmayer, Andreas Wimmer, Raul Bermejo

Large gas engines are typically applied to compensate for peak loads and grid instabilities in the electric power supply. A key component of these engines is the spark plug. Because of the harsh conditions encountered in their use, the spark plug electrodes are subject to significant wear. Conventional electrodes are expensive due to the precious metal alloys they contain. As an alternative, ceramic materials from the groups of silicide, carbides, and nitrides were selected for preliminary experiments that investigate functional as well as mechanical properties and wear behavior. Because of the harsh conditions during operation, the new materials must have a high melting temperature, good thermal shock resistance, high thermal conductivity, and high corrosion/oxidation resistance as well as high density. It was found that the mechanical and thermomechanical properties of certain ceramic candidates are sufficient for application as spark plug electrodes. Furthermore, the chosen ceramic materials achieve an adequate performance in terms of secondary voltage trace and ignition behavior. However, wear resistance may not be sufficient for service times longer than the service time of existing spark plugs and further research is still necessary before ceramic electrodes may be established as a commercial alternative to existing electrodes.

大型燃气发动机通常用于补偿电力供应中的峰值负荷和电网不稳定性。这些发动机的一个关键部件是火花塞。由于使用条件恶劣，火花塞电极磨损严重。传统电极因含有贵金属合金而价格昂贵。作为替代方案，我们选择了硅化物、碳化物和氮化物类陶瓷材料进行初步实验，研究其功能、机械性能和磨损行为。由于工作条件恶劣，新材料必须具有高熔点、良好的抗热震性、高导热性、高抗腐蚀/抗氧化性以及高密度。研究发现，某些候选陶瓷材料的机械和热机械性能足以用作火花塞电极。此外，所选的陶瓷材料在二次电压痕量和点火行为方面也具有足够的性能。不过，耐磨性可能不足以满足使用时间长于现有火花塞使用时间的要求，因此在将陶瓷电极确立为现有电极的商业替代品之前，仍有必要开展进一步的研究。

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引用次数: 0

The effect of TiO2/Yb2O3 binary sintering aids on the properties of UV‐cured Al2O3‐based ceramics TiO2/Yb2O3 二元烧结助剂对紫外固化 Al2O3 基陶瓷性能的影响

IF 2.1 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Ceramic Technology

Pub Date : 2024-07-19 DOI: 10.1111/ijac.14861

Xinyu Miao, Shuangyu Liu, Ping Lu, Hongtao Chu, Fulong Zhang, Chuanjin Huang, Liyan Wang

In this study, an Al2O3‐based ceramic pastes with high solid content and low viscosity for photocuring was prepared. The effects of TiO2/Yb2O3 binary sintering aid on the rheological properties, curing behavior, and bending strength of the sintered parts were systematically investigated. Ceramic samples with an intact surface and no defects were prepared through debinding in various atmospheres followed by pressure‐less sintering at 1600°C. The bending strength of the sintered material was 329 MPa, which represents a 231% increase compared to the bending strength of 99.4 MPa for pure Al2O3 ceramic material prepared using the same process, with the highest recorded bending strength reaching 478.47 MPa. Scanning electron microscopy and X‐ray diffraction analyses revealed that the binary sintering aid acts as a bridge between grains by forming a solid solution with Al2O3 powder at high temperatures, which decreased the pore size and number between Al2O3 ceramic grains, thereby enhancing the bending strength of the ceramics. The prepared ceramic pastes is expected to meet the manufacturing requirements of high‐performance ceramic substrates and accelerate the development of high‐performance ceramic substrate processing technology.

本研究制备了一种高固含量、低粘度的 Al2O3 基光固化陶瓷浆料。系统研究了 TiO2/Yb2O3 二元烧结助剂对烧结部件流变特性、固化行为和弯曲强度的影响。通过在不同气氛中脱脂，然后在 1600°C 下进行无压烧结，制备出了表面完整且无缺陷的陶瓷样品。烧结材料的抗弯强度为 329 兆帕，与采用相同工艺制备的纯 Al2O3 陶瓷材料的抗弯强度 99.4 兆帕相比，提高了 231%，最高抗弯强度达到 478.47 兆帕。扫描电子显微镜和 X 射线衍射分析表明，二元烧结助剂通过在高温下与 Al2O3 粉末形成固溶体，在晶粒之间起到桥梁作用，从而减小了 Al2O3 陶瓷晶粒之间的孔径和孔数，从而提高了陶瓷的抗弯强度。制备的陶瓷浆料有望满足高性能陶瓷基底的制造要求，并加速高性能陶瓷基底加工技术的发展。

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引用次数: 0

Study on the high-temperature resistance of tungsten tailings-based alkali-activated materials by pressure forming 基于钨尾矿的碱活性材料通过压力成型的耐高温性研究

IF 1.8 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Ceramic Technology

Pub Date : 2024-07-19 DOI: 10.1111/ijac.14851

Zhifang Tong, Zhaoxun Xie, Pujie Hua, Qiang Zeng, Shengzhou Zhang, Xianjun Li

Alkali-activated materials (AAMs) were prepared using tungsten tailings via pressure molding and casting, and their high-temperature resistances were analyzed. Variations in their compressive strength, gel, and physical phase transformation, pore structure, and morphology at different temperatures were investigated and comparatively analyzed. Results showed that the compressive strength of both AAMs first increased and then decreased with increasing temperature. At 600°C, the pressure-molded AAM exhibited a considerably higher compressive strength (152.38 MPa) than the cast-molded AAM (42.05 MPa). Thermogravimetric–differential scanning calorimetry, XRD, and FTIR analyses showed that the pressure-molded AAM contained more gel phases than the cast-molded AAM at the same temperature. The gel phase further polymerized and decomposed at high temperatures (>800°C), forming nepheline and zeolite crystals. Mercury intrusion porosimetry and scanning electron microscopy results revealed that pressure molding increases the contact between the gel and unreacted materials, effectively reducing the porosity and densifying the AAM. The pressure-molded AAM had a considerably smaller pore diameter than the cast-molded AAM; thus, the former had considerably higher compressive strength. The porosity and pore size of the pressure-molded AAM gradually increased with the temperature, which polymerized the gel phase and eventually decomposed it; this increased its compressive strength first and then decreased.

利用钨尾矿通过压力成型和铸造制备了碱活性材料（AAMs），并对其耐高温性能进行了分析。研究并比较分析了它们在不同温度下的抗压强度、凝胶和物理相变、孔结构和形态的变化。结果表明，随着温度的升高，两种 AAM 的抗压强度先增大后减小。在 600°C 时，压模 AAM 的抗压强度（152.38 兆帕）明显高于浇铸成型 AAM（42.05 兆帕）。热重-差示扫描量热仪、X 射线衍射和傅立叶变换红外光谱分析表明，在相同温度下，压模成型的 AAM 比浇铸成型的 AAM 含有更多的凝胶相。凝胶相在高温（800°C）下进一步聚合和分解，形成霞石和沸石晶体。汞侵入孔隙模拟和扫描电子显微镜结果表明，压力成型增加了凝胶与未反应材料之间的接触，有效降低了 AAM 的孔隙率并使其致密化。与浇注成型 AAM 相比，压力成型 AAM 的孔径要小得多，因此前者的抗压强度要高得多。压模 AAM 的孔隙率和孔径随着温度的升高而逐渐增大，从而使凝胶相聚合并最终分解；这使得其抗压强度先增大后减小。

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引用次数: 0

Novel approach for predicting the creep behavior of ceramic fibers using dimensional analysis 利用尺寸分析预测陶瓷纤维蠕变行为的新方法

IF 2.1 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Ceramic Technology

Pub Date : 2024-07-19 DOI: 10.1111/ijac.14876

Renan Belli Berman, Renato Saint Martin Almeida, Mohamed Ariff Azmah Hanim, Edson Roberto de Pieri, Hazim Ali Al‐Qureshi

A more generalized approach for predicting the steady‐state creep rate of ceramic fibers under extensive stress ranges is proposed. Creep rate equations derived from dimensional analysis, such as Almeida's creep equation and Arrhenius’ creep equation, were evaluated using Buckingham's method, and the corresponding π groups were determined. Subsequently, a new equation is proposed using the usual semi‐empirical constants for the diffusional and power law creep phenomena, along with an additional power law exponent to account for changes in creep mechanisms at higher stresses. The proposed equation was used to fit the creep rate data of the fiber Nextel 720 at various temperatures and constant stress, which demonstrated a good fit with an adjusted R‐squared of .96. Subsequently, the equation was used to predict the creep rate at constant temperature and various stresses, exhibiting an adjusted R‐squared of .77 and .85, depending on the scatter of the used data. The predictive results of the proposed equation were then compared to those obtained using the Arrhenius creep equation, which tends to higher rates at high stresses. In summary, the novel equation can be more efficiently applied in predicting the creep rate of ceramic fibers across a broader spectrum of stress.

本文提出了一种更通用的方法，用于预测陶瓷纤维在广泛应力范围下的稳态蠕变速率。利用白金汉方法评估了从尺寸分析中得出的蠕变速率方程，如阿尔梅达蠕变方程和阿伦尼乌斯蠕变方程，并确定了相应的 π 组。随后，针对扩散蠕变和幂律蠕变现象提出了一个新方程，该方程使用了常用的半经验常数，并增加了一个幂律指数，以考虑较高应力下蠕变机制的变化。所提出的方程用于拟合纤维 Nextel 720 在不同温度和恒定应力下的蠕变速率数据，结果显示拟合效果良好，调整后的 R 方为 0.96。随后，该方程被用于预测恒温和各种应力下的蠕变率，根据所用数据的分散程度，调整后的 R 方为 0.77 和 0.85。然后将拟议方程的预测结果与使用阿伦尼乌斯蠕变方程得出的结果进行比较，后者在高应力下的蠕变率更高。总之，新方程可以更有效地用于预测陶瓷纤维在更宽应力范围内的蠕变速率。

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引用次数: 0

Aging properties of spinel-type high-entropy oxides (Co.2Cr.2Fe.2Mn.2Zn.2)3O4 for thermistors 热敏电阻用尖晶石型高熵氧化物（Co.2Cr.2Fe.2Mn.2Zn.2）3O4 的老化特性

IF 1.8 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Ceramic Technology

Pub Date : 2024-07-18 DOI: 10.1111/ijac.14866

Liangchen Fan, Jincheng Yao, Yuling Tuo, Aimin Chang, Zhaoyang Chen, Junhua Wang

Herein, a spinel-type high-entropy ceramics (Co_.2Cr_.2Fe_.2Mn_.2Zn_.2)₃O₄ is introduced. The obtained ceramics exhibit superior thermal stability under accelerated aging conditions at 125°C for 500 h, that is, aging drift was less than .35% for all samples sintered at temperatures (1200or–1275or . The variation of resistance is mainly attributed to the oxidation of grain boundaries and the migration of oxygen vacancies. The relationship between crystal structure evolution and aging properties was investigated using structural analysis and P–V–L bonding theory. Theoretically, the Co/Cr/Mn/Fe–O bonds at the octahedral sites in the spinel structure are more important for controlling structural stability.

本文介绍了一种尖晶石型高熵陶瓷（Co.2Cr.2Fe.2Mn.2Zn.2）3O4。所获得的陶瓷在 125°C 下加速老化 500 小时的条件下表现出卓越的热稳定性，即所有在 1200 或 1275 或 1275 温度下烧结的样品的老化漂移均小于 0.35%。电阻的变化主要归因于晶界的氧化和氧空位的迁移。利用结构分析和 P-V-L 键合理论研究了晶体结构演变与老化特性之间的关系。从理论上讲，尖晶石结构中八面体位点上的 Co/Cr/Mn/Fe-O 键对控制结构稳定性更为重要。

引用次数: 0