Dryout temperature-vapor pressure profile of polymeric fiber containing refractory castables

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• 作者：Rafael Salomã ; o^a ; ^{rsalomao@sc.usp.br} ; ^{rflslm@gmail.com} ; Victor C. Pandolfelli^b ; ^{vicpando@ufscar.br}
• 关键词：A. Drying ; E. Refractories ; Fibers
• 刊名：Ceramics International
• 出版年：2013
• 出版时间：August, 2013
• 年：2013
• 卷：39
• 期：6
• 页码：7217-7222
• 全文大小：753 K

文摘

Different types of polymeric fibers are added to refractory castables' formulations as drying additives to make dewatering processes easier and reduce the risks of explosive spalling of these low permeability materials. Many works describe how these fibers control the permeability increase in castables before and after their melting-decomposition. The water vapor pressure profile developed inside the structure and how it is modified by the fiber presence has not yet been explored systemically. In the present paper, thin K-type thermocouples were inserted (at different depths) in polymeric fibers (olefin copolymer, polypropylene and aramidic ones) containing castable samples. Their temperature profile and mass loss were recorded during the first heat-up. After combining internal heating and mass loss rate, vapor pressure levels calculated using Antoine's equation, hot air permeametry (HAP) and work of fracture (¦Ã_WOF) results, novel insights into the mechanisms by which polymeric fibers avoid explosive spalling during castables dewatering were attained.