Influence of processing variables on the microstructure of sol-gel spun alumina fibres

Ramanan Venkatesh; S.R. Ramanan

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Influence of processing variables on the microstructure of sol-gel spun alumina fibres

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High-alumina fibre mats (Al_2O_3-4 wt. percent SiO_2) were prepared with and without organic additives using a sol-gel spinning technique. The effect of processing variables during various stages of oxide fibre preparation, including sol spinning, drying and calcination, on the various types of defects generated were studied. The defects formed due to improper spinning can be diameter variations, hollow fibres, fibre sticking, and shots. The defects generated during calcination includes porous fibres, fibre cracking and core-sheath structures. As the organic content increased, surface roughness after calcination increased and the strength of the fibres decreased. Variations in heating schedules used in the calcination of alumina fibres also had a significant effect on properties of alumina fibre mats, either leading to the generation of fibre mats with good strength or dusty products. Fibres having strengths of 1.2 GPa and good handleability were obtained using a heating rate of 240 deg C/h.

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《Materials Letters》 |2002年第3期|189-195|共7页
作者
Ramanan Venkatesh; S.R. Ramanan;
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作者单位

School of Materials and Mineral Resources Engineering, University Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Seberang Perai Selatan, Pinang, Malaysia;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种英语
中图分类工程材料学;
关键词
Alumina fibres; Processing variables; Sol-gel;

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Influence of processing variables on the microstructure of sol-gel spun alumina fibres

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