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An alumina mat with a nano microstructure prepared by centrifugal spinning method

机译:通过离心纺丝法制备的具有纳米微结构的氧化铝垫

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Ceramic fiber products specially alumina mat because of low thermal conductivity and high melting point are used as high temperature insulating materials. Alumina has so high melting point (T-m > 2040 degrees C) that. its mat can be produced through sol-gel method. In this research alumina mat has been manufactured by sol-gel spinning method using our laboratory-designed centrifugal spinneret. The desired viscosity of sol for spinning is 150 P. Phase transformation of the product begins at 600 degrees C and there is not any amorphous phase at 800 degrees C and theta alumina (theta-Al2O3) is the main phase. In this work, transformation of transitional phase to alpha alumina (alpha-Al2O3) takes place from 1000 degrees C to 1200 degrees C. The optimum percent of silica in alumina mat is 4 wt%. Fibers constitute network structure that their average diameter is about 10 mu m and contains very fine grains (100 nm). The silica percent concerning the limits of this study (< 10 wt%) does not effect on fiber diameter, but grain size decreases from about 200 nm to less than 100 nm while increasing silica percent. (c) 2006 Elsevier B.V. All rights reserved.
机译:陶瓷纤维产品,特别是氧化铝垫,由于其低导热性和高熔点而被用作高温绝缘材料。氧化铝具有很高的熔点(T-m> 2040摄氏度),因此。其垫可以通过溶胶-凝胶法生产。在这项研究中,氧化铝毡是使用我们实验室设计的离心喷丝头通过溶胶-凝胶纺丝法制造的。用于纺丝的溶胶的期望粘度为150P。产物的相变始于600摄氏度,并且在800摄氏度下没有任何无定形相,θ氧化铝(θ-Al2O3)是主要相。在这项工作中,过渡相向α氧化铝(α-Al2O3)的转化发生在1000摄氏度至1200摄氏度之间。氧化铝垫中二氧化硅的最佳百分比为4 wt%。纤维构成网络结构,其平均直径约为10微米,并包含非常细的晶粒(100纳米)。涉及本研究极限的二氧化硅百分比(<10 wt%)对纤维直径没有影响,但是晶粒尺寸从约200 nm减小到小于100 nm,同时增加了二氧化硅百分比。 (c)2006 Elsevier B.V.保留所有权利。

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