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Microstructure, permeability and rheological behavior of lost foam refractory coatings

机译：消失模耐火涂料的微观结构，渗透性和流变行为

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摘要

The effect of microstructure on rheology and permeability of three commercial lost foam refractory coatings available on the market called samples I, II, and III, respectively was investigated in this study. Thermal gravimetric/differential thermal analysis (TG/DTA) method was used for detailed analysis of the organic components and to determine the thermal stability of the coatings. Particle shape and size and particle size distribution (PSD) were obtained by optical microscopy and morphological studies were carried out by scanning electron microscopy (SEM). Also the scanning electron microscopy energy dispersive X-ray analysis (SEM/EDXA) technique was used for elemental analysis of refractory particles. To determine the crystalline structure of the samples, X-ray diffraction (XRD) analysis was carried out. Permeability measurements were conducted with a modified apparatus originally used for determining the permeability of casting sand. Finally the theological behavior of the samples was investigated using a rotating coaxial rheometer to provide the flow curve for coating suspensions. The studies revealed that coating I has the highest permeability, which can be due to its large mean particle size and wide particle size distribution (PSD). Furthermore it was found that the investigated refractory coatings behave as non-Newtonian fluids with shear thinning behavior. All coatings exhibited yield stresses, indicate that they behave as Bingham-type pseudoplastic fluids. (C) 2008 Elsevier B.V. All rights reserved.
机译：在本研究中，分别研究了微结构对市售的三种市售泡沫消失质耐火涂料分别称为样品I，II和III的流变学和渗透性的影响。使用热重/差热分析（​​TG / DTA）方法对有机成分进行详细分析，并确定涂层的热稳定性。通过光学显微镜获得颗粒形状和尺寸以及粒径分布（PSD），并且通过扫描电子显微镜（SEM）进行形态学研究。扫描电子显微镜能量色散X射线分析（SEM / EDXA）技术也用于难熔颗粒的元素分析。为了确定样品的晶体结构，进行了X射线衍射（XRD）分析。用最初用于确定铸砂渗透率的改进设备进行渗透率测量。最后，使用旋转同轴流变仪研究样品的神学行为，以提供涂层悬浮液的流动曲线。研究表明，涂层I具有最高的渗透性，这可能是由于其较大的平均粒径和较宽的粒径分布（PSD）所致。此外，发现所研究的耐火涂层表现为具有剪切稀化行为的非牛顿流体。所有涂层均表现出屈服应力，表明它们表现为宾厄姆型假塑性流体。 （C）2008 Elsevier B.V.保留所有权利。

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