\n\tIn detonation gun spraying, an explosive mixture of fuel, oxygen, and powder is introduced into a long tube\/barrel and is ignited by a spark plug. The resulting detonation-pressure wave heats and accelerates the entrained powder particles, which travel down the water-cooled barrel toward the substrate. Nitrogen is used to purge the barrel between detonations.<\/p>\n
\n\tThe cycle of purging, injection, and detonation is repeated at a frequency of 3 to >10 Hz, producing packets of spray material that deposit as overlapping circles of coating material. Detonation spray processes are hotter and yield longer particle dwell times than conventional flame spray.<\/span><\/p>\n \n\tThe frequency and noise levels (145+ dBA) associated with detonation spraying require that they be confined to acoustical enclosures. High particle velocities, greater than 800 m\/s (2625 ft\/s), are generated. These high particle velocities have been shown to improve particle deformation and increase particle\/coating bonding, eliminating much of the porosity typically found in conventional flame-sprayed coatings.<\/span><\/p>\n \n\tVolume 5A, Thermal Spray Technology<\/span> -> <\/span>Thermal Spray Processes<\/span> and Coatings -> Thermal Spray Processes <\/span><\/p>\n","protected":false},"excerpt":{"rendered":" In detonation gun spraying, an explosive mixture of fuel, oxygen, and powder is introduced into a long tube\/barrel and is ignited by a spark plug. The resulting detonation-pressure wave heats and accelerates the entrained powder particles, which travel down the water-cooled barrel toward the substrate. Nitrogen is used to purge the barrel between detonations.<\/p>\n","protected":false},"author":63082,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-8197","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n