Research On HVOF Thermal Sprays. Final Technical Report

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Independent control of particle velocity and temperature in the HVOF process has been achieved in this research, allowing the variables to change by 170 m/s and 200{degree}C, respectively. The independence was achieved using a specially designed nozzel with multiple axial injection ports, and with an inert diluent added to the oxygen used for combustion. With these changes, notable changes in splat morphology, porosity, and coating oxidation are readily apparent. Increased particle velocity correlates with improved splat deformation, but appears to have little effect on porosity or oxidation. Particle temperature, however, correlates strongly with splat deformation, porosity, and oxidation. In fact, ... continued below

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5 pages

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Settles, G. S. April 2, 2003.

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Description

Independent control of particle velocity and temperature in the HVOF process has been achieved in this research, allowing the variables to change by 170 m/s and 200{degree}C, respectively. The independence was achieved using a specially designed nozzel with multiple axial injection ports, and with an inert diluent added to the oxygen used for combustion. With these changes, notable changes in splat morphology, porosity, and coating oxidation are readily apparent. Increased particle velocity correlates with improved splat deformation, but appears to have little effect on porosity or oxidation. Particle temperature, however, correlates strongly with splat deformation, porosity, and oxidation. In fact, highly dense coatings that have little oxidation can be formed with relatively low velocity particles that have average temperatures in the vicinity of the melting point of the material. This surprising result suggests particle temperature control is the key to creating dense, low-oxide HVOF-sprayed coatings.

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5 pages

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  • Report No.: None
  • Grant Number: FG02-92ER14302
  • DOI: 10.2172/895627 | External Link
  • Office of Scientific & Technical Information Report Number: 895627
  • Archival Resource Key: ark:/67531/metadc881382

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Office of Scientific & Technical Information Technical Reports

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Creation Date

  • April 2, 2003

Added to The UNT Digital Library

  • Sept. 22, 2016, 2:13 a.m.

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  • Jan. 9, 2018, 1:17 p.m.

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Settles, G. S. Research On HVOF Thermal Sprays. Final Technical Report, report, April 2, 2003; University Park, Pennsylvania. (digital.library.unt.edu/ark:/67531/metadc881382/: accessed November 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.