Preparation of LaCrO3 Coatings on Stainless Steel by Magnetron Sputtering Process

以磁控濺射製程鍍覆鉻酸鑭薄膜於不銹鋼基材

何偉友(Wei-Yu Ho) ； 林倚聖(Yi-Shan Lin) ； 張奇龍(Chi-Lung Chang) ； 汪大永(Da-Yung Wang)

《明道學術論壇》 3卷2期 (2007/12) Pp. 1-12

https://doi.org/10.6953/MJ.200712.0001

摘要

不銹鋼材料是製作固態氧化物燃料電池之雙極板的可能材料，然而，在高溫度條件下操作時，不銹鋼材料表面產生氧化物而造成固態氧化物燃料電池之功能衰減。在本文中，以磁控濺射製程鍍覆La-Cr-O薄膜於不銹鋼基材上以改良其特性。由結果顯示，La-Cr-O薄膜呈現非晶質結構，但是，藉由後續在800℃、1小時之退火處理後，薄膜即會相變成LaCrO3陶瓷結晶。以熱重分析儀(TGA)和熱差分析儀(DSC)加熱至800℃分析沉積薄膜後發現鍍覆La-Cr-O薄膜之不銹鋼具有較好的抗氧化性和電傳導性。其原因主要是由於非晶質結構相變爲LaCrO3陶瓷結晶之故。

關鍵字

雙極連接板 ； 鉻酸鑭薄膜 ； 磁控濺射法

並列摘要

Chromium-containing stainless steel is a prospective material for use as an interconnect in solid oxide fuel cells (SOFCs). However, during operations at high temperatures, the growth of oxide scales on the stainless steel causes the deteriorated performance of the SOFC. In this study, deposition of La-Cr-O coatings on stainless steel was conducted by using magnetron sputtering process. By using sputtering process, La-Cr-O coating exhibited with amorphous structure in nature, however, after annealing treatment at 800℃ for 1 hour, the deposited coating with LaCrO3 structure was obtained. Dynamic oxidation of La-Cr-O coated stainless steel studied by using thermo-gravimetric analysis (TGA) and differential scanning calorimeter (DSC) confirms that the better oxidation resistance and electrical resistance of the La-Cr-O-coated stainless steel during isothermal heating process. This was attributed to the transformation of coating from amorphous to LaCrO3 perovskite structure, resulting in a better performance after heating up to 800℃.

並列關鍵字

Magnetron Sputtering ； Thermal-gravimetric analysis TGA ； Differential scanning calorimeter DSC