An Investigation of the Effect of Surface Impurities on the Adsorption Kinetics of Hydrogen Chemisorbed Onto Iron PDF Download
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781725103177
Category :
Languages : en
Pages : 38
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Book Description
The goal of this program has been to develop an understanding of heterogeneous kinetic processes for those molecular species which produce gaseous hydrogen degradation of the mechanical properties of metallic structural materials. During the present program, the interaction of hydrogen with the surfaces of alpha-2 (Ti3Al) titanium aluminide, gamma (TiAl) titanium aluminide, and beryllium were studied. The interaction of low pressure hydrogen with gamma titanium aluminide and beryllium was found to be relatively weak. Weak in the sense that adsorption leads to a low surface concentration of dissociated hydrogen, i.e., the chemisorption process is reversible at room temperature (300 K) for gamma titanium aluminide and the sticking coefficient for chemisorption is extremely small for beryllium. Hydrogen was found to interact readily with alpha-2 titanium aluminide to form a stable surface hydride at 300 K. These results correlate well with other recent studies which show that the mechanical properties for alpha-2 titanium aluminide are readily degraded in hydrogen while gamma titanium aluminide exhibits less degradation and beryllium essentially no degradation. The interaction of oxygen with the surface of several of these materials was studied. More recently, preliminary hydrogen permeation studies were completed for three high temperature alloys, Incoloy 909, Mo-47.5Re (wt. %), and this past year, Haynes 188. Shanabarger, Mickey R. Unspecified Center NASA-CR-197967, NAS 1.26:197967 NCC2-63...
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781725103177
Category :
Languages : en
Pages : 38
Get Book Here
Book Description
The goal of this program has been to develop an understanding of heterogeneous kinetic processes for those molecular species which produce gaseous hydrogen degradation of the mechanical properties of metallic structural materials. During the present program, the interaction of hydrogen with the surfaces of alpha-2 (Ti3Al) titanium aluminide, gamma (TiAl) titanium aluminide, and beryllium were studied. The interaction of low pressure hydrogen with gamma titanium aluminide and beryllium was found to be relatively weak. Weak in the sense that adsorption leads to a low surface concentration of dissociated hydrogen, i.e., the chemisorption process is reversible at room temperature (300 K) for gamma titanium aluminide and the sticking coefficient for chemisorption is extremely small for beryllium. Hydrogen was found to interact readily with alpha-2 titanium aluminide to form a stable surface hydride at 300 K. These results correlate well with other recent studies which show that the mechanical properties for alpha-2 titanium aluminide are readily degraded in hydrogen while gamma titanium aluminide exhibits less degradation and beryllium essentially no degradation. The interaction of oxygen with the surface of several of these materials was studied. More recently, preliminary hydrogen permeation studies were completed for three high temperature alloys, Incoloy 909, Mo-47.5Re (wt. %), and this past year, Haynes 188. Shanabarger, Mickey R. Unspecified Center NASA-CR-197967, NAS 1.26:197967 NCC2-63...
Author: Charles A. Barrett
Publisher:
ISBN:
Category : Nickel-chromium-aluminum alloys
Languages : en
Pages : 44
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Book Description
Author: I. Bezverkhyy
Publisher:
ISBN: 9783037853979
Category : Diffusion
Languages : en
Pages : 0
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Book Description
The International Conference on Diffusion in Materials (DIMAT) is the benchmark conference series for diffusion in solids. DIMAT 2011 was organized by the University of Bourgogne in association with CNRS, Dijon (France). The conference showcased new results concerning theoretical tools as well as applied research approaches. Diffusion processes affect all types of materials: nanomaterials, materials for energy, metallurgy, glasses and ceramics, but each requires its own numerical tools.Volume is indexed by Thomson Reuters CPCI-S (WoS). This volume comprises most of the contributions presented at DIMAT 2011: 4 plenary lectures delivered by famous high-level scientists plus 88 contributions in the form of keynote lectures, talks and posters.
Author: Oswald Kubaschewski
Publisher:
ISBN: 9789201492760
Category : Zirconium
Languages : en
Pages : 268
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Book Description
Author: British Ceramic Society
Publisher:
ISBN:
Category : Ceramics
Languages : en
Pages : 426
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Book Description
Vols. for 1971-74, include a separate section with title: British ceramic abstracts, prepared by the British Ceramic Research Association, also issued separately.
Author: P. B. Hirsch
Publisher: Cambridge University Press
ISBN: 9780521113106
Category : Science
Languages : en
Pages : 0
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Book Description
The Physics of Metals is an advanced treatise written by a team of experts. It presents an authoritative account of selected topics in a major field of modern physics and will prove indispensable to both experimental and theoretical solid state physicists and metallurgists seeking a clear explanation of the state of knowledge of the physical phenomena occurring in metals, without recourse to elaborate mathematics. The whole work was inspired by the desire to honour Sir Nevill Mott by writing an account of some of the topics treated in Mott and Jones's classic work The Theory of the Properties of Metals and Alloys.
Author: G. Martin
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 528
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Book Description
One of the main characteristics of materials science is that it deals with properties which often deviate from linear relationships when compared with such parameters as temperature, pressure, and concentration. The reasons for this behavior of materials are twofold: the speed of linear reaction can vary greatly, and abrupt changes may occur in the static or dynamic states of self-organisation.
Author: T. Daniel Thangadurai
Publisher: Springer Nature
ISBN: 303026145X
Category : Technology & Engineering
Languages : en
Pages : 215
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Book Description
This book discusses the early stages of the development of nanostructures, including synthesis techniques, growth mechanisms, the physics and chemistry of nanostructured materials, various innovative characterization techniques, the need for functionalization and different functionalization methods as well as the various properties of nanostructured materials. It focuses on the applications of nanostructured materials, such as mechanical applications, nanoelectronics and microelectronic devices, nano-optics, nanophotonics and nano-optoelectronics, as well as piezoelectric, agriculture, biomedical and, environmental remediation applications, and anti-microbial and antibacterial properties. Further, it includes a chapter on nanomaterial research developments, highlighting work on the life-cycle analysis of nanostructured materials and toxicity aspects.
Author: Robert V. Miner
Publisher:
ISBN:
Category : Heat resistant alloys
Languages : en
Pages : 36
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Book Description
Author: Kuruvilla Joseph
Publisher: Elsevier
ISBN: 0128175915
Category : Technology & Engineering
Languages : en
Pages : 416
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Book Description
Materials for Potential EMI Shielding Applications: Processing, Properties and Current Trends extensively and comprehensively reviews materials for EMI shielding applications, ranging from the principles to possible applications and various types of shielding materials. The book provides a thorough introduction to electromagnetic interference, its effect on both the environment and other electronic items, various materials that are used for electromagnetic interference shielding applications, and its properties. It explains the mechanism behind EMI shielding, the methods by which EMI SE of a given material is estimated, and the different fabrication methods currently employed for fabricating EMI shielding materials. Final sections focus on the theoretical background of EMI shielding and shielding mechanisms. This theoretical background is extended to the physics of EMI shielding, wherein the physics behind mechanism of shielding is explained. - Focuses on the different types of available EMI shielding, their applications, processing, characterization, and the mechanism behind their shielding - Discusses how to incorporate EMI shielding with low cost, low density and high strength - Provides an understanding and clarifies both elementary and practical problems relating to EMI shielding materials
