Friction and Wear in Metals by Riyadh A. Al-Samarai & Yarub Al-Douri

Author:Riyadh A. Al-Samarai & Yarub Al-Douri
Language: eng
Format: epub
ISBN: 9789819711680
Publisher: Springer Nature Singapore

5.5.4.1 Oxygen Fuel is Sprayed at a High Speed

The technique of high-velocity flame powder spraying, which is created around 1981, involves a continuous burning process with an estimated 400–5000 fps exit gas velocity. An internal combustion chamber is used to burn a fuel gas (often propylene) and oxygen under high pressure (60–90 psi). Through exhaust ports, hot exhaust gases are released from the combustion chamber and expanded into an extended nozzle. This nozzle receives powder that is fed axially, which is then constrained by the exhaust gas flow until it emerges as a thin, high-velocity jet to create coatings that are significantly denser than coatings made using traditional or standard flame spray powder techniques (Fig. 5.16).

Fig. 5.16Technology of detonation flame spray

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