Search for a better mousetrap. The quest for an ideal method of sternal closure

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• 作者：Francis Robicsek ; Alex ; er A. Fokin
• 关键词：Pre-oxidation ; Diffusion barrier ; Interdiffusion ; EB-PVD ; TBCs
• 刊名：European Journal of Cardio-Thoracic Surgery
• 出版年：2008
• 出版时间：May 2008
• 年：2008
• 卷：33
• 期：5
• 页码：767-768
• 全文大小：53 K

文摘

The formation of diffusion barrier on the Ni-based superalloy substrate by low-pressure pre-oxidation is studied in this paper. The pre-oxidation was carried out by heating the substrate under a low-oxygen partial pressure with electron beam of the electron beam physical vapor deposition (EB-PVD) facility. The effect of diffusion barrier was investigated by both isothermal and cyclic oxidations at 1373 K, and the oxidation-kinetic curves were then obtained. The diffusion barrier mainly contains NiO, ,θ-Al₂O₃ and Cr₂O₃, and has a thickness of 185–225 nm. The investigation indicates that the barrier could partially inhibit the interdiffusion of elements of the superalloy substrate and then improve the oxidation-resistance performance of thermal barrier coatings (TBCs) to some extent. However, the difference of thermal cycling lifetime between TBCs samples with and without diffusion barrier is not extremely visible.