Interdiffusion between Ni Based Superalloy and Diffusion Barrier Coatings at 1423K

2006 ◽  
pp. 285-292
Author(s):  
Hiroyuki Matsumaru ◽  
Shigenari Hayashi ◽  
Toshio Narita
Keyword(s):  
Diffusion Barrier ◽  
Barrier Coatings ◽  
And Diffusion

Interdiffusion between Ni Based Superalloy and Diffusion Barrier Coatings at 1423K

2006 ◽  
Vol 522-523 ◽  
pp. 285-292 ◽  
Author(s):  
Hiroyuki Matsumaru ◽  
Shigenari Hayashi ◽  
Toshio Narita
Keyword(s):  
Diffusion Couple ◽  
Single Crystal ◽  
Diffusion Barrier ◽  
Alloy Layer ◽  
Quartz Ampoule ◽  
Diffusion Couples ◽  
Outward Diffusion ◽  
Barrier Coatings ◽  
Diffusion Treatment ◽  
And Diffusion

A diffusion couple study was carried out with Ni-based superalloy / γ’-Ni3Al with or without a Re-based alloy layer. The Re-based alloy containing Re, W, Cr, and Ni was formed on a second generation, single crystal Ni-based superalloy by using electroplating processes to form films of 70at%Re-Ni and Ni-20at%W, followed by Cr-pack cementation at 1573K for 36ks. The superalloy with or without the Re-based alloy layer was bonded to a γ’−Ni3Al alloy in vacuum. Diffusion couples were annealed in an evacuated quartz ampoule at 1423 K for 90 and 360ks. After the 360ks diffusion treatment the Re-based alloy remained sound and suppressed inward Al diffusion from the γ’-Ni3Al, it was further found that outward diffusion of alloying elements from the alloy substrate to the γ’-Ni3Al was also significantly reduced by the Re-based alloy layer.

Comparative Studies on VS2 Bilayer and VS2/Graphene Heterostructure as the Anodes of Li Ion Battery

2021 ◽  
Vol 894 ◽  
pp. 61-66
Author(s):  
Rui Zhi Dong
Keyword(s):  
Binding Energy ◽  
Diffusion Barrier ◽  
First Principles ◽  
Electronic Devices ◽  
Lithium Ion ◽  
First Principles Calculations ◽  
Li Ion Batteries ◽  
Capacity Loss ◽  
Li Ion ◽  
And Diffusion

Due to the development of various mobile electronic devices, such as electric vehicles, rechargeable ion batteries are becoming more and more important. However, the current commercial lithium-ion batteries have obvious defects, including poor safety from Li dendrite and flammable electrolyte, quick capacity loss and low charging and discharging rate. It is very important to find a better two-dimensional material as the anode of the battery to recover the disadvantages. In this paper, first principles calculations are used to explore the performances of VS2 bilayer and VS2 / graphene heterostructure as the anodes of Li ion batteries. Based on the calculation of the valences, binding energy, intercalation voltage, charge transfer and diffusion barrier of Li, it is found that the latter can be used as a better anode material from the perspective of insertion voltage and binding energy. At the same time, the former one is better in terms of diffusion barrier. Our study provides a comprehensive understanding on VS2 based 2D anodes.

Optimization of C/TiC duplex diffusion barrier coatings for SiC /Ti composites based on interfacial structure evolution exploration

2018 ◽  
Vol 44 (14) ◽  
pp. 16528-16534 ◽  
Author(s):  
Minjuan Wang ◽  
Hao Huang ◽  
Xu Huang ◽  
Mao Wen ◽  
Kwang Leong Choy ◽  
...  
Keyword(s):  
Diffusion Barrier ◽  
Interfacial Structure ◽  
Structure Evolution ◽  
Barrier Coatings

The potential respiratory surfaces of a fish living in a historically polluted river

2020 ◽  
Vol 70 (1) ◽  
pp. 101-108
Author(s):  
André Luis da Cruz ◽  
Thiago Matos Prado ◽  
Laísa Peixoto Ramos ◽  
Wilfried Klein
Keyword(s):  
Metabolic Activity ◽  
Morphometric Analysis ◽  
Diffusion Barrier ◽  
Diffusion Distance ◽  
Polluted River ◽  
Atmospheric Air ◽  
Gill Structure ◽  
And Diffusion ◽  
Cutaneous Respiration

Abstract The acquisition of oxygen is fundamental for maintaining metabolic activity in fish, and most species obtain oxygen through aquatic gill respiration. Throughout evolution, different fish lineages have evolved secondary routes to obtain oxygen from atmospheric air, and the spinycheek sleeper, Eleotris pisonis, may be one example of such bimodal respiration. Gill structure and the top epithelium of the head of E. pisonis from the Subaé River (Santo Amaro, Bahia, Brazil) were evaluated morphometrically. The gills showed histopathologies, especially proliferation, which was prevalent on 35.6% of the filaments and on 13.7% of the lamellae, probably increasing the water-blood diffusion barrier of the lamellae to 5.48 ± 1.32 μm, similar to the air-blood diffusion distance of the skin (5.77 ± 1.72 μm). Quantitative morphometric analysis of histopathologies and diffusion distances could be considered as biomarkers, and also suggest the presence of cutaneous respiration as a possible strategy for aerial oxygen acquisition.

Supersaturation by counterperfusion and diffusion of gases

1977 ◽  
Vol 42 (5) ◽  
pp. 758-760 ◽  
Author(s):  
B. A. Hills
Keyword(s):  
Steady State ◽  
Diffusion Barrier ◽  
Decompression Sickness ◽  
Bubble Formation ◽  
Inert Gases ◽  
And Diffusion ◽  
Diffusion Of Gases

Gaseous supersaturation can be induced under steady-state conditions when two inert gases are transmitted in opposite directions across any system comprising a diffusion barrier adjacent to a zone of limited convective capacity. This has many implications for bubble formation in vivo and can explain the occurence of symptoms of decompression sickness without decompression.

Formation of nanostructured Re–Cr–Ni diffusion barrier coatings on Nb superalloys by TVA method

2005 ◽  
Vol 200 (1-4) ◽  
pp. 399-402 ◽  
Author(s):  
C.P. Lungu ◽  
I. Mustata ◽  
G. Musa ◽  
A.M. Lungu ◽  
V. Zaroschi ◽  
...  
Keyword(s):  
Diffusion Barrier ◽  
Barrier Coatings
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