In-flight particle pyrometer for thermal spray processes. Final report, October 1, 1992--December 31, 1994

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The objective of the project was to produce an industrial hardened particle temperature sensor. In general the thermal spray community believes that the particle temperature and velocity prior to impact on the substrate are two of the predominant parameters which effect coating quality. Prior to the full scale prototyping of such an instrument it was necessary to firmly establish the relationship between operating parameters, particle temperature and coating characteristics. It was shown in the first year of this project that the characteristics and consistency of the coatings formed are directly determined by particle velocity and temperature at impact. For the ... continued below

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7 p.

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Creator: Unknown. February 20, 1995.

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Description

The objective of the project was to produce an industrial hardened particle temperature sensor. In general the thermal spray community believes that the particle temperature and velocity prior to impact on the substrate are two of the predominant parameters which effect coating quality. Prior to the full scale prototyping of such an instrument it was necessary to firmly establish the relationship between operating parameters, particle temperature and coating characteristics. It was shown in the first year of this project that the characteristics and consistency of the coatings formed are directly determined by particle velocity and temperature at impact. For the HVOF spray process the authors have also shown that the particle velocity is determined primarily by chamber pressure, while stoichiometry (the ratio of oxygen to fuel) has a minor influence. Hence, particle velocity can be controlled by maintaining the chamber pressure at a set point. Particle temperature, on the other hand is primarily a function of stoichiometry. Therefore particle velocity and temperature can be independently controlled. In the second year (FY-94), an industrial hardened prototype particle temperature sensor (In-flight Particle Pyrometer) was produced. The IPP is a two-color radiation pyrometer incorporating improvements which make the device applicable to the measurement of in-flight temperature of particles over a wide range of operating conditions in thermal spray processes. The device is insensitive to particulate loading (particle feed rate), particle composition, particle size distribution, and provides an ensemble average particle temperature. The sensor head is compact and coupled to the electronics via a fiber optic cable. Fiber optic coupling allows maximum flexibility of deployment while providing isolation of the electronics from electromagnetic interference and the hot, particulate laden environment of a typical spray booth. The device is applicable to all thermal spray processes, including plasma spray, HVOF, twin wire arc, and liquid metal fed processes, as well as other more conventional high temperature processes such as crucible or hearth melting.

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7 p.

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OSTI as DE97054378

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  • Other Information: PBD: 20 Feb 1995

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  • Other: DE97054378
  • Report No.: INEEL--97054378
  • Grant Number: AC07-76ID01570
  • DOI: 10.2172/656793 | External Link
  • Office of Scientific & Technical Information Report Number: 656793
  • Archival Resource Key: ark:/67531/metadc709726

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  • February 20, 1995

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  • Sept. 12, 2015, 6:31 a.m.

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  • July 19, 2016, 12:37 p.m.

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In-flight particle pyrometer for thermal spray processes. Final report, October 1, 1992--December 31, 1994, report, February 20, 1995; Idaho Falls, Idaho. (digital.library.unt.edu/ark:/67531/metadc709726/: accessed April 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.