Microstructure change and deuterium permeation behavior of the yttrium oxide coating prepared by MOCVD

• DOI: 10.1016/j.ijhydene.2014.10.009
• Publication Date: 2014-10-25T20:47:31Z
• Authors: Yunyi Wu; Di He; Shuai Li; Xiaopeng Liu; Shumao Wang; Lijun Jiang
• Keywords: 02 engineering and technology; 0210 nano-technology

Abstract Deuterium permeation measurement s and microstructure analysis on yttrium oxide coating deposited by metal organic chemical vapor deposition (MOCVD) were studied. The composition and microstructure of the coating can be adjusted by tuning sublimation temperature and deposition temperature. It is found that the coating sublimated at 150 °C and deposited at 600 °C possesses compact surface morphology with no pinhole s or cracking was observed. Moreover, the oxygen/yttrium ratio corresponding well to the stoichiometric Y 2 O 3 was observed by X-ray photoelectron spectroscopy (XPS) with no moving of Y3d binding energy doublet peaks and O1s binding energy peak at different depth throughout the coating. The permeation properties of coating s depended much on the microstructure. The coating sublimated at 150 °C and deposited at 600 °C exhibits the best permeability property with PRF value s 412–244 at 873–973 K. However, a permeability drop, especially for the 800 °C deposited coating was observed. It was believed that the obvious increase of pinhole and crack density caused the increase of deuterium permeability. Furthermore, the existence of (Fe,Cr) 2 O 3 , forming a grid structure in the natural oxide layer of stainless steel, increases its hydrogen permeability.