Open Ceramics最新文献_第2页

Joining of oxide/oxide composites by a preceramic polymer 用预陶瓷聚合物连接氧化物/氧化物复合材料

IF 2.8 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2026-01-17 DOI: 10.1016/j.oceram.2026.100911

Monica Ferraris , Aurora Pizzinat , Alessandro Benelli , Stefan Schafföner , Georg Puchas , Kevin Nordengren

Ceramic matrix composites (CMC), particularly oxide fiber-reinforced oxide matrix (ox/ox) composites, offer a viable alternative to traditional materials, due to their high temperature thermo-mechanical stability, intrinsic oxidation resistance and low density compared to metals.

However, a joining material having the same thermo-mechanical behavior and oxidation stability as the ox/ox composites is still an open issue.

In this respect, joining by a preceramic polymer offers a unique option, in principle enabling the fabrication of robust ceramic joints; since the process can be done at lower temperatures in respect to traditional methods such as brazing, it can also be attractive from an energy saving point of view.

This study investigated the use of a polysilazane-based preceramic polymer (Durazane 1800) filled with an increasing amount of alumina particles and 1 wt % chopped alumina fibers to join and coat ox/ox composites. The process was the same for joining and coatings: i.e. curing at 180°C and pyrolysis up to 1200°C in air, followed by microstructural and mechanical characterization on each sample.

Lap-shear tests were done on joined samples at room temperature, at 300°C and at 600°C, in air. Fracture surfaces exhibited cohesive failure, indicating sound adhesion between the joining material and the ox/ox composites. However, residual porosity and incomplete covering of the joined area were identified as a limiting factor affecting the joint strength.

X-ray computer tomography (CT) was used to measure the volume of residual porosity, cracks and lack of coating material after curing and pyrolysis on coated samples.

陶瓷基复合材料（CMC），特别是氧化纤维增强氧化物基（ox/ox）复合材料，由于其高温热机械稳定性、固有抗氧化性和与金属相比的低密度，提供了传统材料的可行替代方案。然而，一种具有与ox/ox复合材料相同的热机械行为和氧化稳定性的连接材料仍然是一个悬而未决的问题。在这方面，预陶瓷聚合物的连接提供了一个独特的选择，原则上可以制造坚固的陶瓷接头；由于与传统方法（如钎焊）相比，该工艺可以在较低的温度下完成，因此从节能的角度来看，它也具有吸引力。本研究研究了一种以聚硅氮烷为基础的预陶瓷聚合物（Durazane 1800）的使用，该聚合物填充了越来越多的氧化铝颗粒和1wt %的切碎氧化铝纤维，以连接和涂覆ox/ox复合材料。连接和涂层的过程相同：即在180°C下固化，在空气中热解至1200°C，然后对每个样品进行微观结构和力学表征。在室温、300°C和600°C的空气条件下，对连接的样品进行了拉剪试验。断口表面表现为内聚破坏，表明连接材料与ox/ox复合材料之间具有良好的附着力。然而，残余孔隙率和连接区域未完全覆盖是影响接头强度的限制因素。利用x射线计算机断层扫描（CT）测量涂层样品在固化和热解后的残余孔隙率、裂纹和涂层材料缺失量。

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引用次数: 0

Editorial for the Special Issue “Young Ceramists Leading the Future” 《青年陶艺家引领未来》特刊社论

IF 2.8 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2026-01-17 DOI: 10.1016/j.oceram.2026.100912

Nicolas Somers , Erkka Frankberg , David Karl , Giorgia Franchin , Awais Qadir , Soňa Hříbalová , Andrea Zocca , Danica Piper , Alejandro Monton Zarazaga

引用次数: 0

Investigation of green femtosecond laser ablation of silicon nitride for different laser fluences and pulse spacing 不同激光影响和脉冲间距下氮化硅绿色飞秒激光烧蚀研究

IF 2.8 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2026-01-14 DOI: 10.1016/j.oceram.2026.100909

Esmaeil Ghadiri Zahrani , AmirMohammad Fakharzadeh Jahromi , Bahman Azarhoushang

The study investigates the effect of laser fluence and normalized pulse spacing at two different focal distances of 70 mm and 100 mm on the green femtosecond ablation of Si₃N₄, focusing on removal threshold and the morphology of the ablated craters. As the fluence increases, the ablation depth reaches a plateau. A considerable difference in ablation depth was observed for both focal lengths in the fluence range of 20 to 40 J/cm² compared to values above 40 J/cm². Surface ablation tests with varying normalized pulse spacings were conducted based on the results of the single-point experiments, showing that higher material removal was achieved at greater pulse overlaps when using high laser fluence. However, at low laser fluence, the difference in material removal was less pronounced. Additionally, the surface quality at different laser fluences and pulse spacings was compared, indicating considerably improved quality at higher pulse spacings and lower laser fluences.

研究了70 mm和100 mm两种不同焦距下激光能量和归一化脉冲间距对Si₃N₄绿飞秒烧蚀的影响，重点研究了去除阈值和烧蚀坑的形貌。随着通量的增加，烧蚀深度达到一个平台。在20至40 J/cm²的焦距范围内，与超过40 J/cm²的焦距相比，观察到烧蚀深度有相当大的差异。在单点实验结果的基础上，进行了不同归一化脉冲间距的表面烧蚀试验，结果表明，当使用高激光通量时，在较大的脉冲重叠处可以实现更高的材料去除。然而，在低激光通量下，材料去除的差异不太明显。此外，还比较了不同激光强度和脉冲间距下的表面质量，表明高脉冲间距和低激光强度下的表面质量显著提高。

引用次数: 0

Recyclability of ceramic powder in CerAM vat photopolymerization 陶瓷粉末在CerAM还原光聚合中的可回收性

IF 2.8 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2026-01-02 DOI: 10.1016/j.oceram.2026.100908

Matilde Aronne , Eric Schwarzer-Fischer , Alberto Ballesio , Nadine Lorenz , Valentina Bertana , Uwe Scheithauer , Sergio Ferrero , Luciano Scaltrito

The sustainability of the manufacturing industry is becoming an increasingly hot topic, particularly the reintroduction of waste into the production chain. The use of AM of ceramics can reduce waste and enable complex, lightweight designs, however, practical routes to circularity remain underdeveloped. This investigation aims to explore the potential of coupling these additive fabrication techniques with raw materials from alternative sources of ceramics, such as printing wastes and error prints, developing a photocurable ceramic suspension for DLP technology. For resin preparation, a polymeric premix was first prepared by combining a mixture of different acrylate monomers as a photoreactive binder with a non-reactive plasticizing additive. Alumina was recovered from failed green bodies following matrix burning out, parts grinding and sieving of the obtained powder. Subsequent investigations of the powder by SEM imaging and EDX analysis were carried out to verify particle morphology and average dimensions and to identify any contaminants in the recycled material. The suspension viscosity and curing behaviour were measured. Finally, the mechanical characteristics of printed parts, their density, their shrinkage, as well as possible contaminants, were evaluated, in order to understand the impact of the recycling process on material performances and to determine its possible application fields. Tests results provided a practical recycling potential for alumina in DLP, offering viable solutions in facilitating closed-loop CerAM manufacturing.

制造业的可持续性正在成为一个越来越热门的话题，特别是将废物重新引入生产链。陶瓷增材制造的使用可以减少浪费，实现复杂、轻量化的设计，然而，实现循环的实际途径仍然不发达。本研究旨在探索将这些增材制造技术与其他陶瓷原料（如印刷废料和错误打印）相结合的潜力，开发用于DLP技术的光固化陶瓷悬浮液。对于树脂制备，首先通过将不同丙烯酸酯单体的混合物作为光反应性粘合剂与非反应性增塑剂相结合来制备聚合物预混料。氧化铝是从失败的绿体中回收的，经过基体烧坏、零件研磨和所得粉末的筛分。随后通过SEM成像和EDX分析对粉末进行了调查，以验证颗粒形态和平均尺寸，并确定回收材料中的任何污染物。测定了悬浮液粘度和固化性能。最后，对打印部件的机械特性、密度、收缩率以及可能的污染物进行了评估，以了解回收过程对材料性能的影响，并确定其可能的应用领域。测试结果提供了氧化铝在DLP中的实际回收潜力，为促进闭环CerAM制造提供了可行的解决方案。

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引用次数: 0

Exploring calcination parameters: Impacts on reaction kinetics, mechanical strength, and microstructural evolution in laterite-derived geopolymers 探索煅烧参数：对红土衍生地聚合物反应动力学、机械强度和微观结构演变的影响

IF 2.8 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2025-12-31 DOI: 10.1016/j.oceram.2025.100907

Rodrigue Cyriaque Kaze , Özgür Cengiz , Abdolhossein Naghizadeh , Hakan Gungunes , Gisèle Laure Lecomte-Nana , Chaouche Mohend

Calcined laterite offers a promising alternative to traditional precursors in geopolymer synthesis. Despite its potential, knowledge regarding the effects of calcination conditions, particularly the heating rate, on its properties remains sparse. This research delved into the impact of different calcination heating rates on laterite and the subsequent geopolymer products by calcining laterite at 600°C for 4 hours, with heating rates ranging from 1.5 to 10°C/min. Analytical techniques including isothermal conduction calorimetry (ICC), setting time determination, XRD, TG/DTA, XF, FTIR, Mössbauer spectroscopy and SEM/EDS were employed to characterize both raw and calcined laterite as well as the resulting geopolymer products.

Key findings indicate that higher heating rates augment the amorphous phase in the precursors, leading to decreased setting times. This reduction is directly associated with heightened reaction activity and increased heat release, as noted from ICC results. Notably, mechanical properties improved at a heating rate of 7.5°C/min, giving a compressive strength of 51 MPa. The mentioned heating rate also resulted in the best porosity and water absorption values of 14 % and 8 %, respectively, suggestive of a more consolidated microstructure. The data ultimately designates 7.5°C/min as the optimal heating rate for crafting geopolymers with superior mechanical and microstructural attributes. Mössbauer spectroscopy revealed details of the iron site geometry and oxidation state, showing an increase in Fe³⁺ content within the silicoaluminate phases. This effect was slightly more pronounced in samples synthesised with a heating rate of 7.5°C/min.

煅烧红土是一种很有前途的替代传统的地聚合物前驱体的合成方法。尽管它具有潜力，但关于煅烧条件，特别是加热速率对其性能的影响的知识仍然很少。本研究通过红土在600℃下煅烧4小时，升温速率为1.5 ~ 10℃/min，研究了不同的煅烧升温速率对红土及其后续地聚合物产品的影响。采用等温传导量热法（ICC）、凝固时间测定、XRD、TG/DTA、XF、FTIR、Mössbauer光谱和SEM/EDS等分析技术对原料和煅烧红土及其产物进行了表征。关键发现表明，较高的加热速率增加了前驱体中的非晶相，导致凝结时间缩短。从ICC的结果中可以看出，这种减少与反应活性的增强和热量释放的增加直接相关。值得注意的是，当升温速率为7.5°C/min时，其力学性能得到改善，抗压强度达到51 MPa。在上述加热速率下，孔隙率和吸水率分别达到14%和8%，表明微观结构更加固结。数据最终指定7.5°C/min为制作具有优越机械和微观结构属性的地聚合物的最佳加热速率。Mössbauer光谱揭示了铁位点几何形状和氧化状态的细节，表明在硅铝酸盐相中Fe3+含量增加。在升温速率为7.5°C/min的样品中，这种效果稍微明显一些。

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引用次数: 0

Innovative mix design of lightweight porcelainised matrix for building comfort: pore - network and microstructures 创新的混合设计的轻质陶瓷基质建筑舒适性：孔网络和微结构

IF 2.8 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2025-12-29 DOI: 10.1016/j.oceram.2025.100905

TCHAKOUTEU MBAKOP Theophile , DEUTOU Nemaleu Juvenal Giogetti , YANNE Etienne , LEMOUGNA NINLA Patrick , NZEUKOU N. Aubin , Gisèle Laure LECOMTE-NANA , Uphie CHINJE , Elie KAMSEU

Controlling pore structure gives ceramic products particular beneficial features such as low thermal conductivity, high chemical and mechanical resistance, or weight reduction. In this study, a novel class of ceramic material was produced with raw mixtures prepared with varying proportions of powdered limestone (1 to 5 wt.%) as a modifier and pore-forming agent on pegmatite and syenite-nepheline-based formulations. The ceramics were characterised using a variety of procedures and analytical techniques after being sintered at 1125 to 1225 °C under a fast-sintering rate of 25 °C/min. The results revealed that, using fast and controlled sintering, the proper addition of limestone into the pegmatite and nepheline syenite-based matrix allowed for the development of controlled porosity (formation of macro and meso‑pores), resulting in a reduced material density (1.9 – 2.1 g/cm³). Moreover, despite their good mechanical properties (flexural strength of 54 – 72 MPa and compressive strength of 70 – 150 MPa), the synthesised ceramics exhibited thermal conductivity performance ranging between 0.4562 and 0.5539 Wm^-1K^-1. Based on the obtained functional properties, the produced high-strength porous ceramics could act as a potential candidate for thermal building materials applications.

控制孔隙结构赋予陶瓷产品特殊的有益特性，如低导热性，高化学和机械阻力，或减轻重量。在这项研究中，一种新型的陶瓷材料是用不同比例的石灰石粉末（1 - 5 wt.%）作为改性剂和成孔剂制备的原料混合物，以伟晶岩和正长-霰石为基础配方。在1125 ~ 1225℃下以25℃/min的快速烧结速率烧结后，采用多种方法和分析技术对陶瓷进行了表征。结果表明，通过快速和控制烧结，在伟晶岩和霞石正长岩基基体中适当添加石灰石，可以形成可控孔隙（宏观和中孔的形成），从而降低材料密度（1.9 - 2.1 g/cm3）。此外，尽管合成陶瓷具有良好的力学性能（弯曲强度为54 - 72 MPa，抗压强度为70 - 150 MPa），但其导热性能在0.4562至0.5539 Wm-1K-1之间。基于所获得的功能特性，所制备的高强度多孔陶瓷可以作为热建筑材料的潜在候选材料。

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引用次数: 0

Fabrication and characterization of eco-friendly CaO-modified cellulose acetate fibers via electrospinning for potential biomedical applications 静电纺丝法制备和表征生态友好型草酸改性醋酸纤维素纤维的潜在生物医学应用

IF 2.8 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2025-12-28 DOI: 10.1016/j.oceram.2025.100906

Wasan Alkaron , Tamás Kolonits , Katalin Balázsi , Csaba Balázsi

New eco-friendly fiber composites were developed by electrospinning cellulose acetate (CA) combined with calcium oxide (CaO) derived from thermally treated waste eggshells. CA solutions were prepared at varying concentrations to optimize the ideal concentration for producing smooth, continuous, and beads-free fibers. Various amounts of CaO were then added to assess its impact on fiber structure, crystallinity, and swelling characteristics.

FTIR examinations demonstrated that CaO was effectively integrated without altering the CA structure, however XRD investigations revealed reduction in crystallinity with increasing CaO content. The swelling capacity remarkedly increased to 710% at 4% CaO, attributed to enhanced porosity and hydrophilicity, before showing a slight decline at higher concentrations due to particle aggregation. These results highlight a sustainable method for producing functional CA/CaO composites with tailored properties for promising applications in biomedical and environmental fields. Our further aim is to study the biocompatibility, cytotoxicity and the photocatalytic activity of the prepared composites.

以经热处理的废蛋壳为原料，采用静电纺丝法将醋酸纤维素（CA）与氧化钙（CaO）结合，制备了新型环保纤维复合材料。制备了不同浓度的CA溶液，以优化生产光滑、连续和无珠纤维的理想浓度。然后加入不同量的CaO来评估其对纤维结构、结晶度和膨胀特性的影响。FTIR测试表明，在不改变CA结构的情况下，CaO被有效地整合，但XRD研究表明，随着CaO含量的增加，结晶度降低。在CaO浓度为4%时，由于孔隙度和亲水性增强，溶胀率再次显著增加至710%，而在较高浓度时，由于颗粒聚集，溶胀率略有下降。这些结果强调了一种可持续的方法来生产具有定制性能的功能性CA/CaO复合材料，在生物医学和环境领域具有广阔的应用前景。我们进一步的目的是研究制备的复合材料的生物相容性、细胞毒性和光催化活性。

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引用次数: 0

Tailoring Ce distribution via precursor engineering in spray pyrolyzed Ce-doped bioactive glass: Insights into bioactivity, cytotoxicity, and antibacterial characteristics in vitro 通过前体工程在喷雾热解Ce掺杂生物活性玻璃中调整Ce分布：对生物活性、细胞毒性和体外抗菌特性的见解

IF 2.8 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2025-12-22 DOI: 10.1016/j.oceram.2025.100903

Sudharshan PG, Yu-Hsiang Chen, Yu-Jen Chou

Bioactive glass (BG) has gained attention for its biocompatible, non-toxic nature in addressing bone defects. One of the limitations is the absence of antibacterial characteristics, which could be addressed through the incorporation of Ce, as it is known to exhibit antibacterial properties. In this study, BG specimens doped with 10 mol% of Ce with three Ce precursors were synthesized via the spray pyrolysis to control the distribution of Ce. Employing X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), the specimens were analyzed on their phase characteristics, particle morphology, inner structure, and elemental distribution. The results demonstrated that both undoped and Ce-doped possess a smooth spherical morphology. Meanwhile, the cross-sectional samples revealed CeN-treated and CeAN-treated specimens led to homogeneous Ce distributions, whereas CeA-treated BG resulted in pronounced Ce segregation on the surface. These differences are attributed to precursor-specific dissolution and migration behavior during synthesis. These distinct Ce distributions influenced their bioactivity, cytotoxicity, and antibacterial characteristics, with CeA-treated specimens demonstrating the highest antibacterial efficiency (94.5 ± 1.32%) against Escherichia coli, and the highest cell viability (105.31 ± 2.78) as compared to the CeN and CeAN-treated specimens.

生物活性玻璃（BG）因其具有生物相容性和无毒性而受到关注。其中一个限制是缺乏抗菌特性，这可以通过掺入Ce来解决，因为已知Ce具有抗菌特性。为了控制Ce的分布，本研究采用喷雾热解法制备了掺量为10 mol% Ce的BG样品和三种Ce前驱体。采用x射线衍射（XRD）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）对样品的物相特征、颗粒形貌、内部结构和元素分布进行了分析。结果表明，未掺杂和掺铈均具有光滑的球形形貌。同时，横断面样品显示，cen处理和cean处理的样品表面Ce分布均匀，而cea处理的BG表面Ce偏析明显。这些差异归因于合成过程中前体特异性溶解和迁移行为。这些不同的Ce分布影响了它们的生物活性、细胞毒性和抗菌特性，与CeN和cean处理的样品相比，cea处理的样品对大肠杆菌的抗菌效率最高（94.5±1.32%），细胞活力最高（105.31±2.78）。

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引用次数: 0

Influence of the rheological behavior of polycaprolactone-borosilicate hybrid compositions on the electrospinning fibers' performance 聚己内酯-硼硅酸盐杂化组合物流变行为对静电纺丝纤维性能的影响

IF 2.8 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2025-12-22 DOI: 10.1016/j.oceram.2025.100904

Soraia A.R. Coelho , Rodrigo Moreno , Maria Helena Vaz Fernandes , José Carlos Almeida

The successful electrospinning of hybrid sol-gel organic-inorganic fibers is challenging, as it relies on the viscosity and temporal stability of the precursor solution. In sol-gel, ongoing hydrolysis-condensation reactions continuously modify rheology, thereby influencing fiber diameter and morphology. To address this, two distinct sol-gel protocols (P1 and P2) were developed by varying water, acid, solvent, and concentration levels to tune crosslinking kinetics. The protocols exhibited different stability profiles and processing windows, resulting in class I hybrids with tailored morphologies. P1 provided a longer 6-hour processing window, yielding porous membranes with larger fibers (∼500 nm), while P2 produced denser membranes with smaller fibers (∼100 nm) within a 2-hour window. These findings demonstrate that adjusting sol-gel chemistry offers a powerful approach to control crosslinking degree and membrane morphology within the same hybrid system. This tunability expands the potential of these membranes for diverse tissue engineering applications, including scaffolds designed to match the distinct structural requirements.

成功的静电纺丝混合溶胶-凝胶有机-无机纤维具有挑战性，因为它依赖于前驱体溶液的粘度和时间稳定性。在溶胶-凝胶中，持续进行的水解-缩合反应不断地改变流变性，从而影响纤维的直径和形态。为了解决这个问题，通过改变水、酸、溶剂和浓度水平来调整交联动力学，开发了两种不同的溶胶-凝胶方案（P1和P2）。这些方案具有不同的稳定性概况和处理窗口，从而产生具有定制形态的I类杂交种。P1提供了更长的6小时加工窗口，产生了具有较大纤维（~ 500 nm）的多孔膜，而P2在2小时窗口内产生了具有较小纤维（~ 100 nm）的致密膜。这些发现表明，调节溶胶-凝胶化学为控制同一杂化体系内的交联度和膜形态提供了一种强有力的方法。这种可调节性扩大了这些膜在各种组织工程应用中的潜力，包括为满足不同结构要求而设计的支架。

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引用次数: 0

Utilization of recycled fired clay brick as a supplement in an acidic environment to create geopolymer materials based on volcanic ash 利用回收的烧制粘土砖作为补充，在酸性环境中创造基于火山灰的地聚合物材料

IF 2.8 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2025-12-19 DOI: 10.1016/j.oceram.2025.100902

Gabriel A. Tchamabo , Hamed I. Riyap , Aimard M.N. Moudio , Charles Banenzoué , Daniel. J.D. Dina

This work aimed to assess how recycled fired clay brick affects the physical, microstructural and compressive strengths of volcanic ash based geopolymer materials made in an acidic environment. The volcanic ash was substituted with 0, 10, 20, 30 and 40 wt. % of recycled fired clay brick powder. A phosphoric acid solution with a molarity of 10 M is utilised as hardener. When the amount of recycled fired clay brick is increased from 0 to 40 wt. %, the compressive strengths of the geopolymer materials rise from 23.19 to 62.22 MPa, water absorption and porosity decrease from 7.73 to 5.96 % and from 13.66 to 11.61 %, respectively. The compact and dense microstructures can be observed on the micrographies of the acid-based geopolymer materials. It can be concluded that incorporation of recycled bricks into volcanic ash improves cohesion between the two aluminosilicate sources in the presence of phosphoric acid, resulting in higher compressive strength of acid-based geopolymers.

这项工作旨在评估再生烧制粘土砖如何影响酸性环境下火山灰基地聚合物材料的物理、微观结构和抗压强度。用0、10、20、30和40 wt %的再生烧制粘土砖粉代替火山灰。使用摩尔浓度为10 M的磷酸溶液作为硬化剂。当再生烧制粘土砖的掺量从0 wt. %增加到40 wt. %时，地聚合物材料的抗压强度从23.19 MPa增加到62.22 MPa，吸水率和孔隙率分别从7.73%和13.66%降低到5.96%和11.61%。在酸基地聚合物材料的显微照片上可以观察到致密的微观结构。由此可以得出结论，在磷酸存在的情况下，将再生砖掺入火山灰中可以改善两种铝硅酸盐源之间的粘聚性，从而提高酸基地聚合物的抗压强度。

引用次数: 0