首页>
外国专利>
AN IMPROVED SLURRY SPRAY PROCESS FOR COATING OF YTTRIA-STABILIZED ZIRCONIA (YSZ) ON STRONTIUM DOPED LANTHANUM MANGANITE (LSM) TUBES FOR SOLID OXIDE FUEL CELL APPLIATIONS
AN IMPROVED SLURRY SPRAY PROCESS FOR COATING OF YTTRIA-STABILIZED ZIRCONIA (YSZ) ON STRONTIUM DOPED LANTHANUM MANGANITE (LSM) TUBES FOR SOLID OXIDE FUEL CELL APPLIATIONS
展开▼
机译：固态氧化锡燃料电池用掺锶镧锰（LSM）管上涂覆钇稳定氧化锆（YSZ）的改进的稀浆喷涂工艺
展开▼
页面导航
摘要
著录项
相似文献
摘要
Existing methods for coating YSZ electrolyte on LSM substrates, especially for tubular geometries are either not suitable or costly. Existing slurry spray methods use mixture of solvents which can cause uneven evaporation and cracking of the YSZ film during drying / sintering. These methods also use dispersants, plasticizers, binders and surfactants which can cause cracking of the YSZ film during sintering. Washing of YSZ slurry followed by classification leads to lot of wastage of YSZ powder. Present invention employs slurry spray method for coating YSZ on LSM substrate. YSZ slurry having solid loading of 2-4% (by volume) is prepared in a non aqueous solvent, preferably ethanol. The slurry is prepared without the addition of any dispersant, binder or plasticizer. An LSM substrate is fixed onto a mandrel after the surface preparation using Silicon Carbide (SiC) abrasive papers having the grit sizes of 180, 400, 600 and 1000 and the mandrel is rotated at a speed of 120-2000 rpm with the help of a motor controlled through an inverter drive. During rotation, the LSM substrate is preheated with the help of a commercial Hand Dryer for 3-5 minutes. The YSZ slurry is then sprayed onto the rotating LSM substrate for 3-5 minutes using a commercial Spray Gun with air, argon or nitrogen (N2) as the carrier gas. LSM substrate is heated with the Hand Dryer during coating to maintain the substrate at a temperature of 40-50 °C. The coated LSM substrate is then kept at 40-50 °C for 12-16 hours for complete drying. The dried coating is then sintered at a temperature of 1410-1460 °C for 5-6 hours to obtain a dense YSZ coating having a thickness of around 15-23 µm, as confirmed by Scanning Electron Microscopy (SEM) analysis.
展开▼
