Powder requirements for aerosol deposition of alumina films
Powder requirements for aerosol deposition of alumina films
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DOI：
10.1016/j.apt.2015.05.016
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发表时间：
2015-07-01
影响因子：
5.2
通讯作者：
Moos, Ralf
中科院分区：
文献类型：
--
作者：
Exner, Joerg;Hahn, Manuel;Moos, Ralf
干粉气溶胶沉积（AD）潜在地提供了优于常规陶瓷涂覆工艺的若干优点。AD在室温下进行，并且各种材料可以用作基底。沉积以相对快的速率发生，并且产物是致密的纳米晶体厚膜。AD的一个局限性与粉末的适用性有关。除了许多其他工艺变量外，沉积的成功取决于起始粉末及其制备，这是通过反复试验确定的。在这项工作中，一个广泛的实验研究14氧化铝粉末的AD的适用性进行了两个不同的基板，氧化铝和玻璃。测量了三种粉末性质：粒度d（50）、比表面积SBET和压缩指数CI，并与后续沉积的成功相关。对于氧化铝基材（高硬度），发现相对高的粉末比表面积（5.5-8 m（2）/g）与良好的膜沉积和附着力相关。对于玻璃基板，初始沉积获得几乎所有的粉末，然而，长期稳定性的问题，显然与残余应变，被证明使用许多粉末。在这种情况下，高质量、良好粘附、稳定的AD膜与相对较低的SBET和在约44- 47%的紧密范围内的可压缩性指数相关。(C)2015年日本粉末技术学会。由Elsevier B. V.和日本粉末技术协会出版。All rights reserved.
Dry powder aerosol deposition (AD) potentially offers several advantages over conventional ceramic coating processes. AD takes place at room temperature, and a variety of materials can be utilized as the substrate. Deposition occurs at a relatively rapid rate, and the product is a dense, nano-crystalline thick film. One limitation for AD is related to the suitability of powders. In addition to the many other process variables, the success of the deposition depends on the starting powder and its preparation, determined by trial and error. In this work, a broad experimental study about the suitability of 14 alumina powders for AD was carried out on two different substrates, alumina and glass. Three powder properties, particle size, d(50), specific surface area, SBET, and compressibility index, CI, were measured and associated with the success of the subsequent deposition. For alumina substrates (high hardness), it was found that a relatively high powder specific surface area (5.5-8 m(2)/g) correlated with good film deposition and adhesion. For glass substrates, initial deposition was obtained with almost all powders; however, problem with long term stability, apparently related to residual strain, was witnessed using many powders. Hi quality, well-adhered, stable AD films in this case were associated with comparatively lower SBET and a compressibility index within a tight range of about 44-47%. (C) 2015 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.