Fabrication Of Refractory Metals
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Fabrication Of Refractory Metals
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Author : Walter D. Wilkinson
language : en
Publisher:
Release Date : 1970
Fabrication Of Refractory Metals written by Walter D. Wilkinson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with Heat resistant alloys categories.
Directed Light Fabrication Of Refractory Metals And Alloys
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Author :
language : en
Publisher:
Release Date : 2006
Directed Light Fabrication Of Refractory Metals And Alloys written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
This report covers deposition of refractory pure metals and alloys using the Directed Light Fabrication (DLF) process and represents progress in depositing these materials through September 1998. In extending the DLF process technology to refractory metals for producing fully dense, structurally sound deposits, several problems have become evident. (1) Control of porosity in DLF-deposited refractory metal is difficult because of gases, apparently present in commercially purchased refractory metal powder starting materials. (2) The radiant heat from the molten pool during deposition melts the DLF powder feed nozzle. (3) The high reflectivity of molten refractory metals, at the Nd-YAG laser wavelength (1.06[micro]m), produces damaging back reflections to the optical train and fiber optic delivery system that can terminate DLF processing. (4) The current limits on the maximum available laser power to prevent back reflection damage limit the parameter range available for densification of refractory metals. The work to date concentrated on niobium, W-25Re, and spherodized tungsten. Niobium samples, made from hydride-dehydride powder, had minimal gas porosity and the deposition parameters were optimized; however, test plates were not made at this time. W-25Re samples, containing sodium and potassium from a precipitation process, were made and porosity was a problem for all samples although minimized with some process parameters. Deposits made from potassium reduced tungsten that was plasma spherodized were made with minimized porosity. Results of this work indicate that further gas analysis of starting powders and de-gassing of starting powders and/or gas removal during deposition of refractory metals is required.
Fabrication Of Refractory Metals Prepared Under The Direction Of The American Society For Metals
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Author :
language : en
Publisher:
Release Date : 1970
Fabrication Of Refractory Metals Prepared Under The Direction Of The American Society For Metals written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with categories.
Directed Light Fabrication Of Refractory Metals
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Author :
language : en
Publisher:
Release Date : 1997
Directed Light Fabrication Of Refractory Metals written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.
Directed Light Fabrication (DLF) is a metal, rapid fabrication process that fuses metal powders to full density into a solid replica of a computer modeled component. It has been shown feasible for forming nearly any metal and also intermetallics to near net shape with a single process. DLF of refractory pure metals is feasible, bypassing the extensive series of conventional processing steps used for processing these high melting point materials. Tungsten, tantalum, and rhenium were processed and show a continuous resolidified microstructure. Porosity was a problem for the tantalum and rhenium powders produced by chemical reduction processes but not for the tungsten powder spherodized in a plasma arc. Chemical analysis of powder compared to the DLF deposit showed reductions in carbon, oxygen and hydrogen, indicating that process parameters may also be optimized for evolution of residual gases in the deposits.
The Effect Of Fabrication History And Microstructure On The Mechanical Properties Of Refractory Metals And Alloys
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Author : Albert G. Imgram
language : en
Publisher:
Release Date : 1963
The Effect Of Fabrication History And Microstructure On The Mechanical Properties Of Refractory Metals And Alloys written by Albert G. Imgram and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1963 with Heat resistant alloys categories.
This report summarizes the present knowledge concerning the relationship among fabrication history, metallurgical structure, and the mechanical properites of the refractory metals columbium, tantalum, bolybdenum, and tungsten, and their alloys. These are the refractory metals currently reveiveing the most attention for aerospace applications, and are therefore the materials considered in this survey. The report is organized into three main sections, titled ''Fabrication'', ''Microstructure and Alloying'', and ''Interstitial Impurities''. The data presented were selected as those which best illustrate the topics discussed. Descriptions of the metaljurgical principles involved are included. Suggestions for optimizing mechanical properties by controlling metallurgical structure are made where possible. (Author).
Refractory Metal Alloys Metallurgy And Technology
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Author : I. Machlin
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Refractory Metal Alloys Metallurgy And Technology written by I. Machlin and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Technology & Engineering categories.
This publication documents Proceedings of the Symposium on Metal lurgy and Technology of Refractory Metal Alloys, held in Washington, D.C. at the Washington Hilton Hotel on April 25-26, 1968, under sponsorship of the Refractory Metals Committee, Institute of Metals Division, of the Metallurgical Society of AIME, and the National Aeronautics and Space Administration. The Symposium presented critical reviews of selected topics in refractory metal alloys, thereby contributing to an in-depth understanding of the state-of-the-art, and establishing a base line for further research, development, and application. This Symposium is fifth in a series of conferences on refractory metals, sponsored by the Metallurgical Society of AlME. Publications issuing from the conferences are valuable technical and historical source books, tracing the evolution of refractory metals from early laboratory alloying studies to their present status as useful engineering materials. Refractory metals are arbitrarily defined by melting point. A 0 melting temperature of over 3500 F was selected as the minimum for this Symposium, thus excluding chromium and vanadium, which logically could be treated with other refractory metals in Groups VA and VIA of the periodic table. The Refractory Metals Committee is planning reviews of chromium and vanadium in subsequent conferences.
The Refractory Metals
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Author : F. H. Buttner
language : en
Publisher:
Release Date : 1968
The Refractory Metals written by F. H. Buttner and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1968 with Heat resistant alloys categories.
The memorandum discusses the supply, production, consumption, and applications of the refractory metals, columbium, tantalum, molybdenum, tungsten, and rhenium. Lists of manufacturers of mill products of these metals are included. (Author).
Refractory Metals In Europe
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Author : Robert Isaac Jaffee
language : en
Publisher:
Release Date : 1961
Refractory Metals In Europe written by Robert Isaac Jaffee and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1961 with Heat resistant alloys categories.
Development Of Fabrication Process For Metallic Fibers Of Refractory Metal Alloys Final Report
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Author :
language : en
Publisher:
Release Date : 1970
Development Of Fabrication Process For Metallic Fibers Of Refractory Metal Alloys Final Report written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with categories.
A Brief Review Of Refractory Metals
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Author : Robert Isaac Jaffee
language : en
Publisher:
Release Date : 1959
A Brief Review Of Refractory Metals written by Robert Isaac Jaffee and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1959 with Heat resistant alloys categories.