Two powder stream diagnostics for laser deposition processes

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The velocity, density, and mass flow of particles suspended in a subsonic gas stream are important aspects of plasma spray and laser deposition processes. This paper will focus on two optical diagnostic techniques applied to the metal powder streams out of a powder feeder and into a new nozzle developed specifically for such applications. An important characteristic of the new powder nozzle is that it produces a very small column (approximately I mm diameter) of powder which can be used for small focus laser deposition and cladding processes. Laser Doppler Velocimetry (LDV) was applied to the nozzle`s output to better ... continued below

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5 p.

Creation Information

Schanwald, L.P. December 31, 1995.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 13 times . More information about this article can be viewed below.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

The velocity, density, and mass flow of particles suspended in a subsonic gas stream are important aspects of plasma spray and laser deposition processes. This paper will focus on two optical diagnostic techniques applied to the metal powder streams out of a powder feeder and into a new nozzle developed specifically for such applications. An important characteristic of the new powder nozzle is that it produces a very small column (approximately I mm diameter) of powder which can be used for small focus laser deposition and cladding processes. Laser Doppler Velocimetry (LDV) was applied to the nozzle`s output to better understand the kinetic parameters (velocity and spatial density) of exiting particles. Optical scattering of the powder stream was used to measure the total mass flow into the nozzle. Different light scattering detector scenarios applied to the input powder stream were used to identify signals useful for mass flow feedback control. Both of these techniques have the advantages of being fast, noninvasive diagnostics of the powder flow characteristics, and with a well established theoretical framework. Together, or individually, these diagnostics can provide real-time control or post-process analysis of the powder stream.

Physical Description

5 p.

Notes

OSTI as DE96004315

Source

  • 14. international congress on applications of lasers and electro-optics, San Diego, CA (United States), 13-16 Nov 1995

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  • Other: DE96004315
  • Report No.: SAND--95-0990C
  • Report No.: CONF-9511146--4
  • Grant Number: AC04-94AL85000;AC04-76DP00789
  • Office of Scientific & Technical Information Report Number: 189116
  • Archival Resource Key: ark:/67531/metadc664941

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • December 31, 1995

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  • June 29, 2015, 9:42 p.m.

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  • April 14, 2016, 7:12 p.m.

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Schanwald, L.P. Two powder stream diagnostics for laser deposition processes, article, December 31, 1995; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc664941/: accessed October 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.