Preparation of free standing alumina thick film by electrophoretic deposition using formed carbon powder as electrode
Preparation of free standing alumina thick film by electrophoretic deposition using formed carbon powder as electrode
复制标题
成形碳粉作为电极电泳沉积制备自支撑氧化铝厚膜
DOI：
10.2109/jcersj.113.513
复制
发表时间：
2005
影响因子：
1.1
通讯作者：
Z. Nakagawa
中科院分区：
文献类型：
--
作者：
S. Hayashi;Tomohiro Aoki;Z. Nakagawa
电泳沉积(EPD)是一种很有吸引力的粉末形成方法，在直流电场的作用下，液体中的带电粒子被强迫迁移到电极上，并沉积成厚膜。作为电沉积方法的一种应用，用成型碳粉作电极，然后烧成，用电沉积方法制备了α-Al_2O_3自支撑厚膜。将石墨或石墨/炭黑混合粉末，加入一定量的粘结剂，单轴压制成型碳电极。将平均粒径为0.6μm的工业氧化铝粉末分散到含有盐酸的乙醇中，以提高其分散性，并将其用于电除尘器。沉积后，在流动的空气中将电极在炉中烧制。为了成功制备氧化铝厚膜，电极中粘结剂的选择是非常重要的。当使用石蜡作为粘结剂时，氧化铝沉积物在加热过程中会被分解成小块，因为电极在加热过程中会大量膨胀。另一方面，当使用聚乙烯醇(PVA)或聚乙烯醇缩丁醛(PVB)时，沉积层被烧结成连续的厚膜。厚膜表面具有微米级不均匀的特征织构，这种织构是从碳电极表面转移过来的。通过改变电极的表面织构，例如通过改变起始碳材料，可以很容易地控制这种微织构。由于形成的碳电极的形状容易改变，用这种方法可以制备出各种形状的氧化铝厚膜组件。在本研究中，先后制备了在其上刻有一些字母的氧化铝厚膜和波浪形的氧化铝厚膜。
Electrophoretic deposition (EPD) is an attractive powder forming method in which charged particles in a liquid are forced to migrate to an electrode by applied DC electric field and deposit to form a thick film. As an application of the EPD method, a free standing α-alumina thick film was prepared by the EPD using formed carbon powder as an electrode and following firing. The formed carbon electrode was prepared by uniaxial pressing of graphite or graphite/carbon black mixed powder, added with some binder. A commercial α-alumina powder with the median diameter of 0.6 μm was dispersed into ethanol, which contained HCl to enhance its dispersibility, and used for the EPD. After the deposition, the electrode was fired in the furnace with flowing air. For the successful preparation of the alumina thick film, the selection of the binder added to the electrode is important. When paraffin was used as a binder, the alumina deposit was broken into small pieces during heating because the electrode largely expands during heating. On the other hand, when polyvinyl alcohol (PVA) or polyvinyl butyral (PVB) was used, the deposit was sintered into a continuous thick film. The surface of the thick film has a characteristic micrometer-scale uneven texture, which is transferred from the surface of the carbon electrode. This microtexture can be easily controlled by altering the surface texture of the electrode, for example by changing the starting carbon material. As the shape of the formed carbon electrode is easily changed, alumina thick film components with various shapes can be prepared by this method. In this study, an alumina thick film on which some letters were patterned, and a wavy shaped alumina thick film were successively prepared.