Study on the high-temperature resistance of tungsten tailings-based alkali-activated materials by pressure forming

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
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Abstract

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.

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基于钨尾矿的碱活性材料通过压力成型的耐高温性研究
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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来源期刊
International Journal of Applied Ceramic Technology
International Journal of Applied Ceramic Technology 工程技术-材料科学:硅酸盐
CiteScore
3.90
自引率
9.50%
发文量
280
审稿时长
4.5 months
期刊介绍: The International Journal of Applied Ceramic Technology publishes cutting edge applied research and development work focused on commercialization of engineered ceramics, products and processes. The publication also explores the barriers to commercialization, design and testing, environmental health issues, international standardization activities, databases, and cost models. Designed to get high quality information to end-users quickly, the peer process is led by an editorial board of experts from industry, government, and universities. Each issue focuses on a high-interest, high-impact topic plus includes a range of papers detailing applications of ceramics. Papers on all aspects of applied ceramics are welcome including those in the following areas: Nanotechnology applications; Ceramic Armor; Ceramic and Technology for Energy Applications (e.g., Fuel Cells, Batteries, Solar, Thermoelectric, and HT Superconductors); Ceramic Matrix Composites; Functional Materials; Thermal and Environmental Barrier Coatings; Bioceramic Applications; Green Manufacturing; Ceramic Processing; Glass Technology; Fiber optics; Ceramics in Environmental Applications; Ceramics in Electronic, Photonic and Magnetic Applications;
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