Directed Light Fabrication Of Refractory Metals And Alloys
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Directed Light Fabrication Of Refractory Metals And Alloys
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Author :
language : en
Publisher:
Release Date : 1999
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 1999 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[mu]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.
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.
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.
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.
Refractory Metals And Alloys Iii Applied Aspects
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Author : Robert Isaac Jaffee
language : en
Publisher:
Release Date : 1966
Refractory Metals And Alloys Iii Applied Aspects 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 1966 with Technology & Engineering categories.
Refractory Metals And Alloys
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Author :
language : en
Publisher:
Release Date : 1966
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 1966 with Heat resistant alloys categories.
Refractory Metals And Their Alloys
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Author :
language : en
Publisher:
Release Date : 1959
Refractory Metals And Their 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 1959 with Heat resistant alloys categories.
Materials And Manufacturing Processes Special Issue On Refractory Metals And Alloys Volume 9 Number 6
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Author : T. S. Srivatsan
language : en
Publisher:
Release Date : 1994
Materials And Manufacturing Processes Special Issue On Refractory Metals And Alloys Volume 9 Number 6 written by T. S. Srivatsan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.
Solid Freeform Fabrication Symposium Proceedings
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Author :
language : en
Publisher:
Release Date : 1997
Solid Freeform Fabrication Symposium Proceedings 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 Solid freeform fabrication categories.
Refractory Metal Alloys Metallurgy And Technology
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Author : I. Machlin
language : en
Publisher:
Release Date : 1968
Refractory Metal Alloys Metallurgy And Technology written by I. Machlin 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.