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Flow Characterization of a Detonation Gun Facility and First Coating Experiments.

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Title: Flow Characterization of a Detonation Gun Facility and First Coating Experiments.
Authors: Henkes, C.1, Olivier, H.1 henkes@swl.rwth-aachen.de
Source: Journal of Thermal Spray Technology. Jun2014, Vol. 23 Issue 5, p795-808. 14p.
Subjects: Computer-control machine tool operators, Spraying equipment, Blast waves, Metal powders, Microscopy, Microhardness
Abstract: A computer-controlled detonation gun based spraying device has been designed and tested to obtain particle velocities over 1200 m/s. The device is able to be operated in two modes based on different flow-physical principles. In one mode, the device functions like a conventional detonation gun in which the powder is accelerated in a blast wave. In the other mode, an extension of the facility with a nozzle uses the detonated gas for an intermittently operated shock tunnel process in which the particles are injected into and accelerated by a quasi-steady high enthalpy nozzle flow with high reservoir conditions. Presented are experimental results of the operation without nozzle in which the device generates moderate to high particle velocities in an intermittent process with a frequency of 5 Hz. A hydrogen/oxygen mixture and Cu and WC-Co (88/12) powders are used in the experiments. Operation performance and tube outflow are characterized by time-resolved Schlieren images and pressure measurements. The particle velocities in the outflow are obtained by laser Doppler anemometry. Different substrate/powder combinations (Al/Cu, Steel/Cu, Al/WC-Co, and Steel/WC-Co) have been investigated by light microscopy and measurements of microhardness. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Thermal Spray Technology is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Flow Characterization of a Detonation Gun Facility and First Coating Experiments.
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  Data: <searchLink fieldCode="AR" term="%22Henkes%2C+C%2E%22">Henkes, C.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Olivier%2C+H%2E%22">Olivier, H.</searchLink><relatesTo>1</relatesTo><i> henkes@swl.rwth-aachen.de</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Thermal+Spray+Technology%22">Journal of Thermal Spray Technology</searchLink>. Jun2014, Vol. 23 Issue 5, p795-808. 14p.
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  Data: <searchLink fieldCode="DE" term="%22Computer-control+machine+tool+operators%22">Computer-control machine tool operators</searchLink><br /><searchLink fieldCode="DE" term="%22Spraying+equipment%22">Spraying equipment</searchLink><br /><searchLink fieldCode="DE" term="%22Blast+waves%22">Blast waves</searchLink><br /><searchLink fieldCode="DE" term="%22Metal+powders%22">Metal powders</searchLink><br /><searchLink fieldCode="DE" term="%22Microscopy%22">Microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Microhardness%22">Microhardness</searchLink>
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  Data: A computer-controlled detonation gun based spraying device has been designed and tested to obtain particle velocities over 1200 m/s. The device is able to be operated in two modes based on different flow-physical principles. In one mode, the device functions like a conventional detonation gun in which the powder is accelerated in a blast wave. In the other mode, an extension of the facility with a nozzle uses the detonated gas for an intermittently operated shock tunnel process in which the particles are injected into and accelerated by a quasi-steady high enthalpy nozzle flow with high reservoir conditions. Presented are experimental results of the operation without nozzle in which the device generates moderate to high particle velocities in an intermittent process with a frequency of 5 Hz. A hydrogen/oxygen mixture and Cu and WC-Co (88/12) powders are used in the experiments. Operation performance and tube outflow are characterized by time-resolved Schlieren images and pressure measurements. The particle velocities in the outflow are obtained by laser Doppler anemometry. Different substrate/powder combinations (Al/Cu, Steel/Cu, Al/WC-Co, and Steel/WC-Co) have been investigated by light microscopy and measurements of microhardness. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Journal of Thermal Spray Technology is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s11666-014-0083-4
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        Text: English
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      – SubjectFull: Computer-control machine tool operators
        Type: general
      – SubjectFull: Spraying equipment
        Type: general
      – SubjectFull: Blast waves
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      – SubjectFull: Metal powders
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      – SubjectFull: Microscopy
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      – SubjectFull: Microhardness
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              Text: Jun2014
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