Chen, Yen-YuYen-YuChenWei, Wen-Cheng J.Wen-Cheng J.Wei2008-12-312018-06-282008-12-312018-06-28200109552219http://ntur.lib.ntu.edu.tw//handle/246246/95358https://www.scopus.com/inward/record.uri?eid=2-s2.0-0034834059&doi=10.1016%2fS0955-2219%2801%2900277-1&partnerID=40&md5=584aea2a7ff3cc2ab29da18415cf7710Several tasks were tried to prepare crack-free mullite films on silica substrates. Basically, a sol containing TEOS (Tetraethylorthosilicate) and boehmite colloid was used for spin coating on silica substrate. The formulation of the sols was kept in stoichiometric composition 3Al 2O 3·2SiO 2, or contained a crack-limiting agent, Polyvinylpyrrolidone (PVP). These films were then treated up to 1300°C. The properties of the sols and the dried films were characterized by rheometer, various thermal analysis techniques (DTA, TGA and TMA), also by XRD, SEM and TEM. The mullite film shows randomly oriented grains in sizes from 0.1 μm to a few micrometers. The films still contain fine θ- and δ-Al 2O 3 particles after being treated at 1280°C for 1 h. © 2001 Elsevier Science Ltd. All rights reserved.application/pdf1620088 bytesapplication/pdfen-USMullite; PVP; Sol-gel processes; Spin coating; Thin filmsSpin coatings; Coatings; Grain size and shape; Rheometers; Scanning electron microscopy; Silica; Sol-gels; Stoichiometry; Transmission electron microscopy; X ray diffraction analysis; Thin films; additive; ceramics; film; mullitejournal article2-s2.0-0034834059http://ntur.lib.ntu.edu.tw/bitstream/246246/95358/1/16.pdf