Effect of catalytic condition on the properties of carbon nanotubes/calcium aluminate cement and its synthesis mechanism

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

International Journal of Applied Ceramic Technology Pub Date : 2024-12-10 DOI:10.1111/ijac.15004

Yunfei Zang, Guoqing Xiao, Donghai Ding, Renhong Yu, Minghui Yang, Han Gao, Jingxin Li

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Abstract

Carbon nanotubes/calcium aluminate cement (CNTs/CAC) have endowed refractory castables with excellent performance. However, the properties of CNTs/CAC at varying catalytic conditions were significantly affected by the characteristics of carbon matters and the microstructure of cement, especially oxidation resistance and water dispersibility. The CNTs/CAC and the pyrolysis process of its precursors were characterized by X-ray diffractometry, scanning electron microscopy, transmission electron microscopy, Raman spectroscopy, and thermogravimetry-Fourier transform. The optimum catalyst content of cement was determined to be 0.2 wt.% (Fe count), the optimal catalytic temperature was 700°C, and the optimal catalytic time was 3 h. The graphitization degree of carbon and the microstructure of cobweb-like carbon/cement particles were optimized within the optimal catalytic conditions, thereby improving the oxidation resistance and water dispersion of CNTs/CAC. In addition, the research of the CNTs/CAC pyrolysis process has also shown that bamboo-shaped carbon nanotubes were aggregated, interweaved, and embedded within the interstices of calcium aluminate particles to form a cobweb-like microstructure during the CNTs/CAC formation process.

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催化条件对碳纳米管/铝酸钙水泥性能的影响及其合成机理

碳纳米管/铝酸钙水泥（CNTs/CAC）赋予耐火浇注料以优异的性能。然而，不同催化条件下CNTs/CAC的性能受到碳物质特性和水泥微观结构的显著影响，尤其是抗氧化性和水分散性。采用x射线衍射、扫描电镜、透射电镜、拉曼光谱和热重-傅里叶变换表征了CNTs/CAC及其前驱体的热解过程。确定水泥的最佳催化剂含量为0.2 wt.% （Fe计数），最佳催化温度为700℃，最佳催化时间为3 h。在最佳催化条件下，优化了碳的石墨化程度和网状碳/水泥颗粒的微观结构，从而提高了CNTs/CAC的抗氧化性和水分散性能。此外，对CNTs/CAC热解过程的研究也表明，在CNTs/CAC形成过程中，竹形碳纳米管在铝酸钙颗粒的间隙内聚集、交织、嵌入，形成网状结构。

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来源期刊

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;