High performance kinetic spray nozzle

• Main Authors: ZHAO, ZHIBO, ELMOURSI, ALAA A, GILLISPIE, BRYAN A, HAN, TAEYOUNG, PATEL, NILESH B
• Format: Patent
• Language: English; French; German
• Published: 20.08.2008
• Subjects: APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL; ATOMISING APPARATUS; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; NOZZLES; PERFORMING OPERATIONS; PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL; SPRAYING APPARATUS; SPRAYING OR ATOMISING IN GENERAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TRANSPORTING

A nozzle assembly (48) for a kinetic spray system includes a convergent portion (72) , a throat portion (82) , and a divergent portion (76) , each cooperating together to define a passage (66) therethrough for passing a mixture of powder particles (22) suspended in a flow of a high pressure heated gas. The nozzle assembly (48) further includes an extension portion (86) attached to the divergent portion (76) and extending to a distal end (88) a pre-determined length (L) from the divergent portion (76) of the nozzle assembly (48) . The extension portion (86) permits a dragging force exerted on the powder particles (22) by the flow of high pressure heated gas to act upon the powder particles (22) for a longer duration of time, thereby permitting the powder particles (22) to accelerate to a greater velocity than has been previously achievable.