The study of 8YSZ electrolyte deposition on plasma sprayed anode by the dip-coating method

• Main Authors: Yi-Chu Han, 韓浥竹
• Other Authors: 楊永欽
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/zhuv7n

碩士 === 國立臺北科技大學 === 材料科學與工程研究所 === 99 === In order to get a dense coating, this study to prepare 8YSZ electrolyte layer on plasma sprayed anode by the dip-coating technology. The method don’t limit the shape of substrate, moreover, it has advantage of producing the uniform coating under to 4 % porosity. In the study, using different sintering temperature and holding time to improve the density of electrolyte layer, and explore the anode and electrolyte changes in the microstructure after sintering. By changing humidity and intermission time in the dipping process can influence the rate of drying the slurry, furthermore the thickness of the electrolyte membrane can be improved by increasing the number of immersion. The results in scanning electron microscopy (SEM) observation that the specimen microstructure, the best sintering conditions is 1450度 for 6 hours, when the temperature is too low will cause the electrolyte layer with higher porosity, but too high will make the specimen sintering excessive, and have a bigger holes between the anode and the electrolyte layer. Relative atmospheric humidity for the dipping process is not much influence, except with a short time 30s in the high humidity. In this conditions will make the slurry is difficult to dry, so it can’t prepare the complete layer of electrolyte. With AC impedance analysis, increasing the sintering temperature can reduce the ohmic resistance. But when sintering temperature reaches 1550度, it will cause the poor adhesion of electrolyte, the charge is not easy to across the interface and also increasing the interface resistance.