Preparation of metakaolin based geopolymer coatings on metal substrates as thermal barriers
Preparation of metakaolin based geopolymer coatings on metal substrates as thermal barriers
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DOI：
10.1016/j.clay.2009.08.015
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发表时间：
2009-11-01
影响因子：
5.6
通讯作者：
van Riessen, Arie
中科院分区：
文献类型：
--
作者：
Temuujin, Jadambaa;Minjigmaa, Amgalan;van Riessen, Arie
在不锈钢和低碳钢基体上制备了偏高岭土基地质聚合物涂层。地质聚合物涂层的附着力强烈依赖于组合物。在70 ℃下固化后，Si：Al = 1的地质聚合物结晶为沸石LTA和A，而对于Si：Al = 2和2.5的组合物，涂层是无定形的。对于Si：Al = 2.5的组合物，粘合强度> 3.5MPa，而对于Si：Al = 1和2，仅实现了对金属基材的弱粘合。将这些地质聚合物组合物加热至1000摄氏度导致铝硅酸钠或霞石的形成。Si：Al = 2.5组合物的热膨胀测量显示在800 ° C下高达6%的膨胀，而对于Si：Al = I和Si：Al = 2组合物，观察到高达4%的收缩。(C)2009爱思唯尔有限公司版权所有。
Metakaolin based geopolymer coatings on both stainless and mild steel substrates have been prepared. Adhesion of the geopolymer coatings strongly depended on composition. After curing at 70 degrees C geopolymer with Si:Al = 1 crystallized to zeolites LTA and A, while for compositions of Si:Al = 2 and 2.5 the coating was amorphous. For compositions with Si:Al = 2.5 the adhesive strength was > 3.5 MPa while for Si:Al = I and 2 only weak adhesion to the metal substrates was achieved. Heating these geopolymer compositions to 1000 degrees C resulted in formation of sodium aluminosilicate or nepheline. Thermal expansion measurements of the Si:Al = 2.5 composition revealed expansion of up to 6% at 800 degrees C, while for Si:Al = I and Si:Al = 2 compositions up to 4% shrinkage was observed. (C) 2009 Elsevier B.V. All rights reserved.