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首页> 外文会议>The First International Conference on Electrophoretic Deposition: Fundamentals and Applications; Aug 18-22, 2002; Banff, Alberta, Canada >TiO_2 COATINGS ON SiC-TYPE FIBROUS SUBSTRATES BY ELECTROPHORETIC DEPOSITION
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TiO_2 COATINGS ON SiC-TYPE FIBROUS SUBSTRATES BY ELECTROPHORETIC DEPOSITION

机译：电泳沉积在SiC型纤维状基体上的TiO_2涂层

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摘要

Electrophoretic deposition (EPD) has been used to obtain TiO_2 coatings on three-dimensional Nicalon~R SiC fibrous substrates. Non-aqueous colloidal suspensions of commercially available TiO_2 nanoparticles in acetylaceton with addition of iodine were used. Electrophoretic deposition was carried out for 3 minutes at 30 volts. Strongly adhered TiO_2 deposits with very low residual porosity were obtained. Microscopy observations revealed high penetration of the titania nanoparticles into the fibre preforms. The deposits were sintered at 800℃ for 1 hour in order to obtain relatively dense and uniform TiO_2 coatings covering completely the SiC fibres. Oxidation tests established the effectiveness of the coating at 1000℃ in air atmosphere. After 120 hours the coated fibres showed an increase of weight due to oxidation over twice less than that of uncoated fibres. The TiO_2 coated SiC fibre preforms are attractive materials for manufacturing hot gas filters and as reinforcing elements for ceramic matrix composites.
机译：电泳沉积（EPD）已用于在三维Nicalon〜R SiC纤维基体上获得TiO_2涂层。使用可商购获得的TiO_2纳米颗粒在乙酰丙酮中加碘的非水胶体悬浮液。电泳沉积在30伏下进行3分钟。获得了具有非常低的残余孔​​隙率的牢固附着的TiO_2沉积物。显微镜观察显示二氧化钛纳米颗粒高渗透到纤维预成型坯中。沉积物在800℃下烧结1小时，以获得相对致密且均匀的TiO_2涂层，该涂层完全覆盖SiC纤维。氧化测试确定了该涂层在空气中1000℃下的有效性。 120小时后，由于氧化，包覆纤维的重量增加是未包覆纤维的重量的两倍。 TiO_2涂层的SiC纤维预成型件是用于制造热气过滤器的有吸引力的材料，并且是陶瓷基复合材料的增强元素。

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