Reaction Heat Utilization in Aluminosilicate-Based Ceramics Synthesis and Sintering

IF 0.5 4区 材料科学 Q4 MATERIALS SCIENCE, CERAMICS Journal of Ceramic Science and Technology Pub Date : 2017-03-01 DOI:10.4416/JCST2016-00094
Marjaana Karhu, J. Lagerbom, Päivi Kivikytö-Reponen, A. Ismailov, E. Levänen
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引用次数: 4

Abstract

Self-propagating high-temperature synthesis (SHS) is a widely known and extensively studied highly exothermicreaction-utilizing technique for making certain advanced composites and intermetallic compounds. However, only few studies have been published about the SHS of pure aluminosilicate ceramics. In the current work, possibilities for aluminosilicate ceramic synthesis and sintering requiring less energy based on the utilization of SHS in air was studied. Kaolinite powder and exothermically reactive metallic aluminium powder were used as raw materials. Thermodynamic calculations for the possible reactions and reaction paths were performed to show the theoretical possibilities for SHS utilization. The chemical reactions, thermal expansion behaviour and formed phaseand microstructures after SHS were compared to the conventional reaction sintering of mullite. Results conclude that highly exothermic reactions above 900 °C relating mainly to aluminium oxidation can ignite the SHS reaction in air atmosphere. After initialization, the reaction proceeded in a self-sustaining manner through entire test pieces, resulting in the formation of an Al2O3 Si phase structure. Thermodynamic calculations showed the total energy balance for mullite formation from aluminium and kaolinite mixtures as highly exothermic in nature only if sufficient oxygen is available to complete the reactions. However, future research is needed to fully utilize SHS in aluminosilicate ceramics processing.
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反应热在硅酸铝基陶瓷合成和烧结中的应用
自蔓延高温合成(SHS)是一种广为人知、研究广泛的高放热反应,利用该技术制备某些先进的复合材料和金属间化合物。然而,关于纯铝硅酸盐陶瓷的SHS的研究很少。在目前的工作中,研究了基于在空气中利用SHS合成和烧结低能耗铝硅酸盐陶瓷的可能性。以高岭土粉末和放热反应性金属铝粉为原料。对可能的反应和反应路径进行了热力学计算,以显示SHS利用的理论可能性。将SHS后莫来石的化学反应、热膨胀行为以及形成的相和微观结构与常规反应烧结进行了比较。结果表明,在空气气氛中,900°C以上主要与铝氧化有关的高度放热反应可以引发SHS反应。初始化后,反应以自维持的方式通过整个试件进行,导致Al2O3-Si相结构的形成。热力学计算表明,只有在有足够的氧气来完成反应的情况下,铝和高岭石混合物形成莫来石的总能量平衡在性质上是高度放热的。然而,在硅铝酸盐陶瓷加工中充分利用SHS还需要进一步的研究。
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来源期刊
Journal of Ceramic Science and Technology
Journal of Ceramic Science and Technology MATERIALS SCIENCE, CERAMICS-
CiteScore
0.80
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0.00%
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0
期刊介绍: The Journal of Ceramic Science and Technology publishes original scientific articles on all topics of ceramic science and technology from all ceramic branches. The focus is on the scientific exploration of the relationships between processing, microstructure and properties of sintered ceramic materials as well as on new processing routes for innovative ceramic materials. The papers may have either theoretical or experimental background. A high quality of publications will be guaranteed by a thorough double blind peer review process.
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